CN107282033B - A kind of photochemical catalyst and preparation method thereof for air V OC processing - Google Patents
A kind of photochemical catalyst and preparation method thereof for air V OC processing Download PDFInfo
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- CN107282033B CN107282033B CN201710531681.8A CN201710531681A CN107282033B CN 107282033 B CN107282033 B CN 107282033B CN 201710531681 A CN201710531681 A CN 201710531681A CN 107282033 B CN107282033 B CN 107282033B
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- 238000006303 photolysis reaction Methods 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000036299 sexual function Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 description 1
- PQDJYEQOELDLCP-UHFFFAOYSA-N trimethylsilane Chemical compound C[SiH](C)C PQDJYEQOELDLCP-UHFFFAOYSA-N 0.000 description 1
- 229940094989 trimethylsilane Drugs 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/10—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of rare earths
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8678—Removing components of undefined structure
- B01D53/8687—Organic components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/063—Titanium; Oxides or hydroxides thereof
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/64—Pore diameter
- B01J35/653—500-1000 nm
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/64—Pore diameter
- B01J35/657—Pore diameter larger than 1000 nm
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- B01D2255/802—Photocatalytic
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
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- B01D2257/708—Volatile organic compounds V.O.C.'s
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Abstract
The invention belongs to photocatalysis fields, are related to a kind of photochemical catalyst and preparation method thereof for air V OC processing.The photochemical catalyst includes the silica aerogel powder and binder of cellular ceramic substrate, nano-titanium oxide and rare earth solid solution bluk recombination；Nano-titanium oxide and the silica aerogel of rare earth solid solution bluk recombination are supported on by the cementation of binder on micropore ceramics carrier.The silica aerogel of nano-titanium oxide with rare earth the solid solution bluk recombination of its catalytic action in the photochemical catalyst of the present invention, dichloride in anatase type grade titanium oxide is equably attached to the hole surface of silica aerogel with rare earth solid solution, prepare the catalysis material for capableing of the gaseous pollutants such as long-acting, potent ground adsorption-decomposition function formaldehyde in air, toluene, not only it had solved aeroge itself and has not had photocatalytic degradation function, but also overcome the deficiency of the pure nano-titanium dioxide absorption capture function of monodisperse；The function of absorption capture and photocatalytic pollutant degradation is set to roll into one.
Description
Technical field
The invention belongs to photocatalysis fields, and in particular to a kind of photochemical catalyst and its preparation side for air V OC processing
Method.
Background technology
It is counted according to Chinese Center for Disease Control and Prevention, the lung cancer that causes in recent years by air pollution, leukaemia, no
The illnesss such as pregnant, fetal anomaly, cutaneum carcinoma, rhinocarcinoma, throat cancer are commonplace.Moreover, children are easier than adult by interior
The harm of air pollution.A large amount of startling facts confirm that air pollution has become " the stealthy killer " for endangering human health,
Also the problem of being paid close attention to jointly as whole world various countries.And how to solve the problems, such as this, then at it in the weight of major owner concern
Weight.
Photocatalysis is under the conditions of certain wavelength light is shone, and the separation of photo-generated carrier, then photoproduction occur for semi-conducting material
Electrons and holes are being combined the living radical for generating and having oxidisability or reproducibility, this living radical with lewis' acid
Can be carbon dioxide or other small organic molecules and water by organic matter macromolecules degradation, this semiconductor during the reaction
Material i.e. photochemical catalyst itself do not change.
Photocatalysis technology is as a kind of environmentally friendly depollution of environment technology efficiently, safe, to indoor air quality
Improvement has obtained the approval of international academic community.Photocatalysis technology is a kind of novel nano depollution of environment technology, in the item for having illumination
Under part, photocatalyst continuously purifies indoor and outdoor air, and disinfection may result from cleaning effect for skin again
Fruit.Because its material safety and environmental protection, not consume the energy, environment purification efficient, the 21 century depollution of environment is considered by environmental protection sector
The revolutionary of field breaks through, and is known as " the optimal depollution of environment technology in the world today ".
Optically catalytic TiO 2 technology can effectively decompose the toxic and harmful gas such as formaldehyde, the benzene in air.Light is urged at present
The problem of major obstacle for changing Technique Popularizing is that cost is excessively high, performance unstable easy poisoning.Non- immobilized photochemical catalyst powder
Body in use, since grain graininess is small, thus recycles difficult, easy poisoning, and when there is high-valence cationic in solution
It is not easy to dissipate, the immobilized rear above problem solves substantially.Currently used carrier is mostly inorganic material, predominantly silicate and
Metal, glass is easily molded, translucency is good, but surface is smooth, to the energy of attachment force difference of catalyst, is easy to run off to catalyst, compares table
Area is small, influences the activity of photochemical catalyst.
Application number：200810051025.9 Chinese patent is related to a kind of preparation of inorganic functional material, especially with more
Hole mineral are carrier, and load broad stopband N-type semiconductor prepares light and urges agent and its method.It uses natural porous mineral and artificial modification
The porous mineral of acquisition is prepared into carrier, realizes that N-type of the load with photo-catalysis function is partly led using sol-gel dipping method
Body and composite semiconductor, obtained catalyst are applied to the photocatalytic degradation of organic pollution or answering as product filler
With.But that there are particles is uneven for the semiconductor for preparing of above-mentioned preparation method or composite semiconductor, easily poisoning and catalytic efficiency is not
Enough high problems.
Therefore, how to prepare the photochemical catalyst of a effective performance stabilization and high catalytic efficiency is the skill for needing to solve at present
Art problem.
Invention content
In view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of photochemical catalyst for air V OC processing and
Preparation method, the silicon airsetting of nano-titanium oxide with rare earth the solid solution bluk recombination of its catalytic action in photochemical catalyst of the invention
Glue, dichloride in anatase type grade titanium oxide are equably attached to the hole surface of silica aerogel with rare earth solid solution, and preparing can grow
The catalysis material of the gaseous pollutants such as effect, potent ground adsorption-decomposition function formaldehyde in air, toluene, preparation process avoid nanoscale
The reunion problem of titanium oxide, while sintering temperature is greatly reduced, reduce cost.Nano-titanium dioxide is loaded into aeroge
On, making aeroge not only has the function of that absorption captures the aerial formaldehyde molecule that dissociates, but also is fixed by uniform load
In aeroge surface or the nano-TiO of nanometer hole wall2Photocatalysis can be the first for adsorbing capture in aeroge nano aperture
Aldehyde is decomposed in illumination condition.Not only it had solved aeroge itself and has not had photocatalytic degradation function, but also to overcome monodisperse pure
Nano-titanium dioxide adsorbs the deficiency of capture function；Absorption is set to capture function and formaldehyde degradation by photocatalytic oxidation process of the pollutants such as formaldehyde etc.
The function of pollutant rolls into one.
To achieve the above object, the present invention adopts the following technical scheme that：
The photochemical catalyst for air V OC processing of the present invention, the photochemical catalyst include that nano-titanium oxide and rare earth are solid
Solution compound silica aerogel powder, binder and cellular ceramic substrate, the mass ratio 6-12 of three:0.2-3:110-200；It receives
Rice titanium oxide and the silica aerogel of rare earth solid solution bluk recombination are supported on by the cementation of binder on micropore ceramics carrier；Institute
The pore diameter range for stating cellular ceramic substrate is 800nm-3200nm, the silica aerogel powder of nano-titanium oxide and rare earth solid solution bluk recombination
The grain size of body is 700-1300nm.
The photocatalysis effect of the photochemical catalyst for air V OC processing of the present invention：Rate of photocatalytic oxidation >=90.8g/
30min, stability >=99.84%, service life >=3 year, light transmittance >=90%, porosity of=75%, specific surface area >=
500m2/g。
The photochemical catalyst for air V OC processing as described above, the cellular ceramic substrate be porous cordierite carrier,
Vermiculite ceramic monolith, diatomite ceramic monolith；The shape of the cellular ceramic substrate mesoporous is cellular or cylindric；
Nano-titanium oxide and the preparation method of aerogel particles of rare earth solid solution bluk recombination are：
(1) aerogel particles are sieved through 300 mesh, is soaked in 30~36h in 20 DEG C of ammonium hydroxide, obtain material A；By rare earth nitric acid
Salt is with 1:1 weight ratio is dissolved in deionized water, and material B is obtained after filtering；
(2) it is 5% that the weight ratio meter of titanium oxide is converted into titanium sulfate, is 95% by required titanium sulfate and weight ratio meter
Deionized water carry out being mixed and made into solution；Solution is carried out continuing to stir and is heated to 75~90 DEG C, keeps constant temperature, 60~
The material A that step (1) is produced at the uniform velocity is added in 90 minutes, ultrasound is opened in speed of agitator control while 500~800 revs/min
Vibration, the amount that material A is added is determined by the weight of silica aerogel, and the weight of silica aerogel is to be converted into titanium oxide with titanium sulfate
0.36~0.5 times of weight；
(3) it is to be adjusted to 8.0~9.5 to continuously add appropriate ammonium hydroxide by pH value, then with 30~80 revs/min of stirring speed
Degree continues to stir, and stirring while opens ultrasonic vibration；Reaction 60~90 minutes, obtains slurry C；
(4) slurry C is filtered, washed, the pH value for controlling slurry C is 7~8, while making the slurry C after being filtered, washed
Solid content>40%；Then, its 2 times of deionized water is added, while material B is added, wherein material B middle rare earth nitrate is with oxide
The weight of meter is the 3~7% of titania weight, and speed of agitator is controlled at 500~800 revs/min, and stirring is warming up to 75~90 DEG C
When, it is 7~7.5 that ammonium hydroxide tune pH value, which is added dropwise, and hydrogen peroxide is added, and the addition of hydrogen peroxide is to expect B middle rare earth nitrate with oxide
The 10% of the weight of meter is stirred to react 30 minutes；To material solid content after washing, filtering>When 40%, collects and obtain slurry D；
(5) slurry D is spray-dried, tubular type oscillation sintering furnace is entered after dry, adding in tubular type oscillation sintering furnace
Hot temperature is 450~600 DEG C, so that the titanium hydroxide for being coated on silica aerogel surface with rare-earth hydroxide is converted into nanoscale sharp
Titanium-type titanium oxide and rare earth oxide solid solution finally obtain nano-titanium oxide and the compound silicon airsetting of rare earth oxide solid solution
Glue photochemical catalyst.
It is used for the photochemical catalyst of air V OC processing as described above, the rare earth nitrades in step (1) to be lanthanum nitrate, nitre
Sour cerium or neodymium nitrate；
The frequency of ultrasonic vibration is 20~35KHz in step (2) or step (3), and power density is 0.3~0.8W/cm；
200~300 DEG C of spray drying inlet temperature used, 100~120 DEG C of outlet temperature in step (5)；
The angle of inclination of tubular type oscillation sintering furnace is 5~8 DEG C in step (5), and vibration frequency is 300~380 beats/min.
As preferred technical solution：
Photochemical catalyst as described above for air V OC processing, the preparation method of silica aerogel presoma are：
(1) mixed solution of silicon source and solvent is prepared
The sodium metasilicate for several 3.0-4.0 that rub is taken to be fitted into reaction kettle, the deionized water progress that 1-3 times of sodium metasilicate quality is added is dilute
It releases, reaction kettle is stirred 30 minutes with 80-200 revs/min of speed, through 200 mesh screens, obtains sodium silicate solution；
The aqueous solution of sodium metasilicate is commonly called as waterglass, it is made of the alkali metal and silica of different proportion, changes
Formula is R2O·nSiO2, R in formula2O is alkali metal oxide, and n is the ratio of silica and alkali metal oxide molal quantity,
The referred to as number that rubs of waterglass, the most commonly used is sodium silicate water glass Na2O·nSiO2；
(2) colloidal sol
It takes A sour, A acid metal salts is added in A acid and rare earth A hydrochlorates are added in a manner of spray to step after mixing
Suddenly the sodium silicate solution that (1) obtains；The material in reaction kettle is carried out soon with 1200-2000 revs/min of speed while spray
Speed stirring, the pH value for controlling sodium silicate solution is 1.5-3.0, obtains colloidal sol；
(3) gel
Sodium hydroxide or ammonium hydroxide are taken, it is 10-11.5 that deionized water, which is added, and is diluted to pH value, is added in a manner of spray to anti-
It answers in kettle；The material in reaction kettle is quickly stirred with 1200-2000 revs/min of speed while spray, works as reaction kettle
When the pH value of interior material is 4.5-5.5, spray is terminated, gel is obtained；The mode that standing is usually used in the prior art carries out always
Change, take 3~5 days, gel can't be stirred, the reason is that being that needs are quiet during the prior art generally believes aging
It sets, stands the structure growth that can be convenient for aeroge；
(4) aging
Stirring 3-10 hours is continued with 20-50 revs/min of speed in reaction kettle, aging is carried out to the material in reaction kettle,
It is 35-50 degrees Celsius to control material in reactor temperature；
(5) solvent is replaced
It carries out continuing stirring 60-180 minutes in reaction kettle, while being added same with aging material in step (4) reaction kettle
The displacement solvent of volume, to displace remaining moisture；
(6) surface modification
It carries out continuing stirring in reaction kettle, while continuously adding and aging material same volume in step (4) reaction kettle
Coupling agent；By stirring 60-180 minutes, the aerogel precursor body for being coated with displacement solvent and coupling agent is obtained.Above-mentioned steps
(6) coupling agent that surface modification is added cements out the water in aeroge micropore, and coupling agent is filled into aeroge micropore, energy
The stability for enough improving microcellular structure, improves the evenness of pore size；In addition, by carrying out table to different coupling agents is added
After the modification of face, aeroge hydrophobicity, hydrophilic sexual function can be adjusted.
The above-mentioned aerogel precursor body using normal temperature and pressure technique productions is a kind of light porous amorphous state of structure-controllable
There is inorganic nano material continuous tridimensional network, porosity to be up to 80% or more, and average pore size is 20nm or so, than
Surface area is more than 500 ㎡/g, and density is less than 70kg/m3, thermal coefficient is less than 0.020W/ (mK) under normal temperature and pressure, than static
The thermal conductivity 0.022W/ (mK) of air is also low, be at present rare low cost, industrialization, low heat conductivity solid material.
The photochemical catalyst for air V OC processing as described above, in step (2), the A acid is sulfuric acid, hydrochloric acid, oxalic acid
Or nitric acid, it is adjusted to 6-15mol/L with deionized water；The A acid metal salts are A acid zirconates or A acid aluminium salts；The rare earth A acid
Salt is A acid cerium salt, A acid yttrium salt or A acid lanthanum salts；
In step (2), in terms of oxide, the molar ratio of the two is 100 for the A acid metal salts and rare earth A hydrochlorates:1-6；A
The molar ratio 2-5 of silica in the oxide and sodium metasilicate of acid metal salt:100；A acid metal salts and rare earth A hydrochlorates are easy the moisture absorption,
Metering can be caused inaccurate, so for its addition of accurate quantitative analysis, A acid metal salts described in above-mentioned steps (2) and rare earth A acid
For salt in terms of oxide, the molar ratio of the two is 100：1~6；It is aoxidized in the oxide and sodium metasilicate of A acid metal salts in step (2)
The molar ratio 2~5 of silicon：100；For example, A acid metal salts are aluminum sulfate, in terms of its oxide, i.e., with oxygen in aluminium oxide and sodium metasilicate
The molar ratio of SiClx is 2~5：100；
In step (5), the displacement solvent is one or more mixtures of methanol, acetone, n-hexane or heptane；
Stirring described in step (5) or step (6) is that heart offer is quickly forward stirred in a kettle, the periphery at reaction kettle center
Baffle plate is provided；
Coupling agent described in step (6) is hexamethyldisilazane, bis- (trimethylsilyl) acetamides, methoxyl group trimethyl silicane
Alkane, dimethoxydimethylsilane, phenyl triethoxysilane, phenyltrimethoxysila,e, vinyltrimethoxysilane, first
One or more mixtures of ethyl triethoxy silicane alkane and methyl trimethoxy oxygroup alkane.
The photochemical catalyst for air V OC processing as described above, in step (2), the A acid is sulfuric acid, hydrochloric acid, oxalic acid
Or nitric acid, it is adjusted to 6-15mol/L with deionized water；The A acid metal salts are A acid zirconates or A acid aluminium salts；The rare earth A acid
Salt is A acid cerium salt, A acid yttrium salt or A acid lanthanum salts；
In step (2), in terms of oxide, the molar ratio of the two is 100 for the A acid metal salts and rare earth A hydrochlorates:1-6；A
The molar ratio 2-5 of silica in the oxide and sodium metasilicate of acid metal salt:100；
In step (5), the displacement solvent is one or more mixtures of methanol, acetone, n-hexane or heptane；
Stirring described in step (5) or step (6) is that heart offer is quickly forward stirred in a kettle, the periphery at reaction kettle center
Baffle plate is provided；
In step (6), the coupling agent is hexamethyldisilazane, bis- (trimethylsilyl) acetamides, methoxyl group trimethyl
Silane, dimethoxydimethylsilane, phenyl triethoxysilane, phenyltrimethoxysila,e, vinyltrimethoxysilane,
One or more mixtures of methyltriethoxysilane and methyl trimethoxy oxygroup alkane.
The silica aerogel presoma of preparation is put into drying kettle by the photochemical catalyst as described above for air V OC processing,
It is filled with nitrogen in drying kettle and catches up with oxygen, until oxygen content is less than 3% in drying kettle, microwave then is carried out to the material in drying kettle
Vacuum drying；Negative pressure 0.08-0.12MPa in drying kettle, temperature are 85-135 DEG C, and the silicon airsetting of solid powder is made after dry
Glue.
The preparation method of photochemical catalyst as described above for air V OC processing, includes the following steps：
Nano-titanium oxide and the silica aerogel powder of rare earth solid solution bluk recombination is taken to be put into sand mill and grind；
Binder is prepared with gravimetric method：
Take the bentonite and deionized water of 10~65 parts by weight of sodium metasilicate, 10~40 parts by weight of potassium silicate, 5~30 parts by weight
It is stirred evenly after the mixing of 30~90 parts by weight；
20~80 parts by weight of organic organosilicon-modified acrylic emulsion are added；
5~40 parts by weight of Ludox are added, stir evenly；
1~15 parts by weight of aluminum phosphate are added, stir evenly, adjust pH value to 7-8；
1~15 parts by weight of 1~10 parts by weight of coupling agent and coalescents are added, stirs evenly, then uses high speed dispersion
Sand mill is sanded, and prepares finely dispersed binder；
Nano-titanium oxide after grinding is dissolved with rare earth in the silica aerogel powder addition binder of bluk recombination and is stirred
After even plus water mixes, and mixed slurry is made；Then after cellular ceramic substrate being immersed in above-mentioned mixed slurry again, air stirring
For a period of time, after taking out cellular ceramic substrate and blowing out additional size, the photocatalysis for air V OC processing is made in high temperature sintering
Agent.
The preparation method of the photochemical catalyst for air V OC processing as described above, the water content of the Ludox≤
70%, solid content >=60% of the organosilicon-modified acrylic emulsion；In step (1), the abrading-ball of the sand mill is diameter
For the zirconium ball of 0.8-2mm；In step (3), the silica aerogel powder of nano-titanium oxide and rare earth solid solution bluk recombination, binder and add
The weight part ratio of the water entered is 6-12:0.1-3.5:110-200.
The preparation method of the photochemical catalyst for air V OC processing as described above, in step (3), air in impregnating bath
The method of stirring is：Impregnating bath bottom equipped with mixed slurry is equipped with coil pipe, and the aperture of 0.2-1mm is provided at the top of coil pipe, uses 2-6
Kilogram compressed air inflated into coil pipe, realize air stirring, air stirring is cannot to stop during step (3) implement
；In step (3), air knife is referred to as using additional size in air knife blowout cellular ceramic substrate, air knife number is 2 times；Step
Suddenly in (3), when high temperature sintering, 500 DEG C first are warming up to 5h in tunnel room, keeps the temperature freely cool down after 1h and is made above-mentioned for empty
The photochemical catalyst of gas VOC processing.
Aeroge is also known as blue smoke, with following characteristic：1, several infinite more nano-pores are distributed in the inside of aeroge
And air vent wall, air can not be flowed freely in nanometer stomata, be relatively adsorbed on air vent wall, aerogel material is in class
Likelihood dummy status, effectively reduces convection current heat transfer, and heat is transmitted in solid material and can be transmitted along air vent wall；2, aeroge can have
Effect ground penetrates sunlight, and prevents the infrared emanation of environment temperature, becomes a kind of ideal transparent heat-insulated material, makes material
Thermal conductivity substantially reduces.
The silica aerogel that nano-titanium oxide is dissolved bluk recombination with rare earth must be attached on carrier and can use, carrier palpus
Meet the following conditions：1, must have sizable specific surface area；2, necessary high temperature resistant, because the titanium dioxide of photochemical catalyst is only
Have and be possible to reach anatase crystal type by high temperature, titanium dioxide only reaches anatase crystal type and has photocatalysis property just now；3、
Must have good impact resistance, ageing-resistant, corrosion-resistant and good installation with performance etc..Certainly there is the change of material
It is preferable to learn many factors, the ceramic monoliths such as the cost performance of property, the complexity of technical process and assembly.
The present invention reaction principle be：Silica aerogel is considered as the solid of world's upper density minimum, with traditional absorption
Material is compared, specific surface area bigger, has stronger adsorption capacity, is ideal catalyst carrier.It prepared by titanium oxide
At rare-earth oxidation magnesium-titanium solid solution, on the one hand, make titanium oxide that there is higher catalytic activity；On the other hand, rare earth (lanthanum, cerium or neodymium)
Oxide makes nano size Titania, and larger amount of realization anatase crystal type conversion, which part rutile titania are brilliant at relatively low temperature
The titanium oxide of type is changed into the titanium oxide of rutile-type.Nano-titanium oxide is attached in the specific surface of silica aerogel micropore, makes silicon
Aeroge not only has the function of that absorption captures the gaseous pollutants such as formaldehyde in air, but also can rely on and be carried on its surface
The gaseous pollutant captured by absorption is decomposed in the photocatalysis of anatase type titanium oxide；It is adsorbed with harmful gas in no light, there is light
When catalytic decomposition the release innocuous gas and moisture content that are converted；I.e. silica aerogel has nano level microcellular structure, empty in pollution
Gas has carried out pollution air before being contacted with nano size Titania the screening of one early period, keeps formaldehyde, toluene etc. harmful
Gas enters the micropore of silica aerogel with nanoscale and titanium oxide occurs catalysis and reacts, and avoids titanium oxide and is chronically exposed to pollution
Lead to failure there is a situation where " poisoning " in air；The present invention sieves the early period of the nano micropore structure of silica aerogel
The advantages of selecting the catalysis of function and nano-scale anatase titanium oxide is rolled into one, and the long-acting of the material catalysis is realized
Change and potentization.
In addition to formaldehyde, the present invention in product to other volatile organic compounds (abbreviation VOC) existing for interior,
PM2.5 also has long-acting removal effect；
Nano-titanium oxide comprehensive silicon aerogels powder is nano-titanium dioxide and silica aerogel (nano-TiO2/
Si aeroges) complex form, product when in use, utilizes the pollutants such as silica aerogel formaldehyde adsorption, nano-TiO2Photodissociation first
The pollutants such as aldehyde decompose in absorption, achieve the effect that long-acting decomposition, using the form decomposed in absorption, solve absorption
After material adsorption saturation the problem of disabler, the pollutant of absorption will not discharge again；
Nano-titanium oxide comprehensive silicon aerogels powder uses nano-TiO2The compound form of/Si aeroges, tool
There is the characteristics of two aspects of potent property and long-term effect, for removing formaldehyde：First, it is potent, it is right in 48 hours under fluorescent light
Removal rate >=95% of formaldehyde；Second, long-acting, aeroge is responsible for formaldehyde adsorption, TiO2It is responsible for photocatalysis Decomposition, by Formaldehyde decomposition
Cheng Shui and carbon dioxide decompose in absorption, then adsorb and decompose again, formaldehyde is constantly removed, even if in the ring of not illumination
Under border, still can formaldehyde adsorption, have and the formaldehyde of absorption decomposed again when illumination；
The present invention is by nano-TiO2It is supported on silica aerogel surface, effect has following two points：
(1) it is said from material preparation angle, makes nano-TiO2Uniform particle is dispersed in aerogel particle surfaces, and due to gas
The inhibition of gel carrier, nano-TiO2Particle is difficult to the reunion that attracts each other；In addition, since aeroge carrier itself is contained
The ingredients such as amorphous silica, iron oxide, aluminium oxide make nano-TiO2Energy gap reduce, it is seen that the utilization rate of light carries
Height, namely significantly improve the photocatalysis performance of material under visible light；
(2) it is said from application performance angle, nano-titanium dioxide is loaded on silica aerogel, silica aerogel is made not only to have
Absorption captures the function for the aerial formaldehyde molecule that dissociates, and is fixed on aeroge surface or nano-pore by uniform load
The nano-TiO of wall2Photocatalysis the formaldehyde that capture is adsorbed in aeroge nano aperture can be decomposed in illumination condition；
Not only it had solved aeroge itself and has not had photocatalytic degradation function, but also overcome the pure nano-titanium dioxide absorption of monodisperse and capture work(
The deficiency of energy；The function that absorption captures the pollutants such as the functions of the pollutants such as formaldehyde and formaldehyde degradation by photocatalytic oxidation process is set to roll into one；
Although while using sorbing material such as aeroge and pure nano-TiO2Also the combination that can realize two kinds of functions, still, due to nanometer
TiO2Dosage seldom and be difficult to evenly dispersed in sorbing material, nano-TiO2Particle may be from adsorbate aerogel particle
Distance farther out, because the limitation of operating distance is difficult to degrade the pollutants such as the formaldehyde adsorbed in aerogel particle；This material is due to receiving
Rice TiO2Particle just in the surface of aerogel particle or hole wall, can closely act on the pollutants such as the formaldehyde that absorption captures, because
This, photocatalytic degradation efficiency is higher, and dosage lacks
The beneficial effects of the present invention are：
1, the present invention adds the techniques such as ultrasonic vibration, spray drying, tubular type oscillation high temperature sintering, solution in preparation process
The technical issues of dichloride in anatase type grade titanium oxide of having determined is easy to spontaneously form aggregate, and titanium oxide agglomeration traits are to cause to prepare
The main reason for cost remains high；The carrier of the prepared catalysis material of the present invention is firmly combined with active component, adheres to
It is evenly coated, photocatalysis performance is good, the gaseous pollutants such as formaldehyde, toluene in adsorption-decomposition function air that can be long-acting, potent.
2, a certain amount of rare earth oxide is added in preparation process of the invention, nano size Titania can be made lower
At a temperature of the conversion of larger amount of realization anatase crystal type, while promoting to enhance the catalytic activity of nano-titanium oxide；The use of the present invention
The purchasing of raw materials be easy extensive, price is low, moreover, process is relatively easy, it is easy to accomplish industrialization, production cost are low.
3, the aeroge in the present invention is added in the form of aerogel precursor body, without step is dried, is produced into
This is low；In addition, aerogel precursor body is to prepare at normal temperatures and pressures, stabilization simple for process is safe, and technical process is from tradition
300h be down to 30h, the process units investment of same production capacity is only the 1/20 of conventional method, and the prices of raw materials are lower than traditional silicon source
100 times or more, product cost is only the 1/10 of conventional method.
4, the operation principle that in the present invention prepared by aerogel precursor body is：In the preparation method of aerogel precursor body, gel
The A acid metal salts and rare earth A hydrochlorates being added in the process can achieve the effect that toughening and improve silica aerogel heat resistance；Aging
It is to carry out in the state of stirring with solvent swap step, substantially increases reaction efficiency, have compressed the process time, is suitble to production
Industry.
5, compared with prior art, advantage has the following to silica aerogel forerunner preparation in the present invention：
(1) in recent years, there are some about relevant report and the patent text for preparing aeroge under room temperature differential pressure in the prior art
It offers, but is to rest on laboratory preparatory phase mostly, technical process is longer, while process implementing narrow limits, it is difficult to realize
Large-scale industrialized production and application；The present invention provides the preparation methods under normal temperature and pressure, and it is opposing stationary to change the prior art
Technique, apply in critical process process and stir, speeded up to the hydrolysis, polycondensation and modification of aeroge, realize in 30h and close
At the technique of aerogel precursor body, a kind of method that industrial batch prepares rare earth toughening aeroge is provided, is aeroge
A large amount of manufacture and use provide premise；
(2) one of hinder the reason of aeroge development that be aeroge have reticular structure, but the structure in the prior art
Edge it is relatively thin, more crisp, compression strength is low, and easy compression is caved in, and causes performance unstable；Present invention addition rare earth A hydrochlorates
With A acid metal salts, the toughness of the material is improved, improves the intensity of aeroge；
(3) temperature in use of the aeroge of prior art preparation is relatively low, generally used below also more stable at 500 DEG C,
500 DEG C or more the internal structure changes that can lead to aeroge, cause thermal coefficient to decline；The present invention addition rare earth A hydrochlorates and A
Acid metal salt improves the heat resistance of the material, improves the heat resisting temperature of aeroge.
6, the three-dimensional structure of silica aerogel presoma plays an important role during its performance plays, if gas
Hole in Gel Precursor is blocked by binder and can not just play a role；
Traditional aeroge is prepared at high temperature under high pressure, if the later stage is not specially treated, porous three-dimensional space
It is easy to be blocked and failed by binder or other raw materials, and then it is made to lose heat insulation, in addition, aeroge is porous three-dimensional vertical
Body spaces union can play better thermal insulation together, can found the three-dimensional inside aeroge after being separated by binder
Isolated island is isolated into body space, and then generates island effect, reduces the heat insulation of aeroge；
Containing displacement solvent in the aerogel precursor body prepared using method in the present invention, before displacement solvent occupies aeroge
Drive porous three-dimensional space in vivo, binder or other raw materials can not invade it is porous in occupy its three-dimensional space, protect
In warm plate drying process, displacement solvent volatilization is maintained to porous 3 D stereo after solvent volatilizees in aeroge
Structure overcomes failure and island effect caused by hole is blocked.
Specific implementation mode
The invention will be further elucidated with reference to specific embodiments.It should be understood that these embodiments are merely to illustrate this hair
It is bright rather than limit the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, art technology
Personnel can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Fixed range.
Embodiment 1
The preparation method of silica aerogel presoma is：
(1) mixed solution of silicon source and solvent is prepared
It takes several 3.0 waterglass that rub to be fitted into reaction kettle, the deionized water of 2.5 times of quality is used in combination to be diluted, 180 revs/min
Clock stirs 30 minutes, through 200 mesh screens, obtains water glass solution.
(2) colloidal sol
It takes 8mol/L sulfuric acid, sulfuric acid zirconates is added (sulfuric acid zirconates in terms of its zirconium oxide, with the silica of water glass solution
Molar ratio is 5:100), (for sulfuric acid yttrium salt in terms of its yttrium oxide, the molar ratio with aluminium oxide is 1 to sulfuric acid yttrium salt:100)；Mixing is equal
After even, spray is added the water glass solution obtained to step (1), and spray while is quickly stirred with 1300 revs/min of speed
It mixes, control ph is controlled to spray, spray time is stopped when 1.5 at 100 minutes；Obtain colloidal sol.
(3) gel
The sodium hydroxide solution for being 11 by pH value, spray are added into colloidal sol obtained by step (2), with 1300 while spray
Rev/min speed quickly stirred, until pH value be 5 when stop spray, 120 minutes used times, obtain gel.
(4) aging
Reaction kettle continues stirring 10 hours with 40 revs/min of speed to gel, and control reaction kettle inner gel temperature is taken the photograph for 45
Family name's degree.
(5) solvent is replaced
The displacement solvent hexane with the material same volume of aging, stirring 2 are added while being stirred in reaction kettle
Hour.
(6) surface modification
The coupling agent with the material same volume of aging is added in reaction kettle；The coupling agent is dimethoxy dimethyl-silicon
Alkane, by stirring 150 minutes, obtain being coated with the silica aerogel presoma of displacement solvent and coupling agent after surface modification.
The preparation method of solid-state silica aerogel, includes the following steps：The silicon airsetting of displacement solvent and coupling agent will be coated with
Glue presoma carries out micro-wave vacuum, and nitrogen catches up with oxygen to oxygen content to be less than 3% in drying kettle, and negative pressure 0.08MPa, 95 is Celsius
Degree, microwave frequency control in the range of 2450MHZ ± 10MHZ, the silica aerogel solid powder for obtaining toughening in 55 minutes.
After testing, average pore size 26nm, specific surface area is 588 ㎡/g, loose specific weight 0.057g/cm to product3, it is super-hydrophobic,
Fire-retardant, thermal coefficient 0.021W/MK, 880 DEG C of heat resisting temperature, compressive resistance 0.118MPa.
Embodiment 2
The preparation method of silica aerogel presoma is：
(1) mixed solution of silicon source and solvent is prepared
It takes several 3.2 waterglass that rub to be fitted into reaction kettle, the deionized water of 3 times of quality is used in combination to be diluted, 200 revs/min,
Stirring 30 minutes, through 200 mesh screens, obtains water glass solution.
(2) colloidal sol
Take 10mol/L nitric acid, be added hydrochloric acid aluminium salt (hydrochloric acid aluminium salt in terms of aluminium oxide, aluminium oxide and oxygen in water glass solution
The molar ratio of SiClx is 2:100), (for hydrochloric acid lanthanum salt in terms of lanthana, the molar ratio with aluminium oxide is 3 to hydrochloric acid lanthanum salt:100)；It is mixed
After closing uniformly, spray is added the water glass solution obtained to step (1), and spray while is carried out fast with 1200 revs/min of speed
Speed stirring, until 2.5, spray time was controlled at 100 minutes control ph；Obtain colloidal sol.
(3) gel
By the ammonia spirit of pH value 10.5, spray is added to colloidal sol obtained by step (2), with 1200 revs/min while spray
Speed quickly stirred, until pH value be 4.5 when stop spray, 150 minutes used times, obtain gel.
(4) aging
Reaction kettle continues stirring 5 hours with 30 revs/min of speed, and control reaction kettle inner gel temperature is 50 degrees Celsius；
(5) solvent is replaced
The displacement solvent methanol with the material same volume of aging is added while being stirred in reaction kettle, to displace
Remaining moisture.
(6) surface modification
The coupling agent with the material same volume of aging is added in reaction kettle；The coupling agent is vinyl trimethoxy silicon
Alkane obtained the silica aerogel presoma for being coated with displacement solvent and coupling agent after surface modification by stirring 100 minutes.
The preparation method of solid-state silica aerogel, includes the following steps：The silicon airsetting of displacement solvent and coupling agent will be coated with
Glue presoma carries out micro-wave vacuum, and nitrogen catches up with oxygen to oxygen content to be less than 2% in drying kettle, and negative pressure 0.09MPa, 110 is Celsius
Degree, microwave frequency control in the range of 2450MHZ ± 10MHZ, 50 minutes, obtain the silica aerogel solid powder of toughening.
After testing, average pore size 28nm, specific surface area is 568 ㎡/g, loose specific weight 0.056g/cm to product3, it is super-hydrophobic,
Fire-retardant, thermal coefficient 0.0198W/MK, 920 DEG C of heat resisting temperature, compressive resistance 0.122MPa.
Embodiment 3
The preparation method of silica aerogel presoma is：
(1) mixed solution of silicon source and solvent is prepared
It takes several 4.0 waterglass that rub to be fitted into reaction kettle, the deionized water of 3 times of quality is used in combination to be diluted, 80 revs/min,
Stirring 30 minutes, through 200 mesh screens, obtains water glass solution.
(2) colloidal sol
15mol/L nitric acid is taken, oxalic acid aluminium salt is added, and (in terms of aluminium oxide, the molar ratio with silica in water glass solution is
3:100), (in terms of lanthana, the molar ratio with aluminium oxide is 6 to oxalic acid lanthanum salt:100)；After mixing, spray is added to step
(1) water glass solution obtained, spray while, are quickly stirred with 1800 revs/min of speed, and control ph is to 2.5
Only, spray time control was at 100 minutes；Obtain colloidal sol.
(3) gel
By the sodium hydroxide solution of pH value 11.5, spray is added to colloidal sol obtained by step (2), with 1200 while spray
Rev/min speed quickly stirred, until pH value be 5.5 when stop spray, 80 minutes used times, obtain gel.
(4) aging
Reaction kettle continues stirring 5 hours with 50 revs/min of speed, and control reaction kettle inner gel temperature is 35 degrees Celsius；
(5) solvent is replaced
The displacement solvent acetone with the material same volume of aging is added while being stirred in reaction kettle, to displace
Remaining moisture.
(6) surface modification
The coupling agent with the material same volume of aging is added in reaction kettle；The coupling agent is hexamethyldisilazane, double
(trimethylsilyl) acetamide, methoxytrimethylsilane weight respectively account for the mixture of one third, by stirring 180 minutes, table
The silica aerogel presoma for being coated with displacement solvent and coupling agent is obtained after the modification of face.
The preparation method of solid-state silica aerogel, includes the following steps：The silicon airsetting of displacement solvent and coupling agent will be coated with
Glue presoma carries out micro-wave vacuum, and nitrogen catches up with oxygen to oxygen content to be less than 1% in drying kettle, and negative pressure 0.12MPa, 80 is Celsius
Degree, microwave frequency control in the range of 2450MHZ ± 10MHZ, 60 minutes, obtain the silica aerogel solid powder of toughening.
After testing, average pore size 27nm, specific surface area is 575 ㎡/g, loose specific weight 0.058g/cm to product3, it is super-hydrophobic,
Fire-retardant, thermal coefficient 0.0202W/MK, 725 DEG C of heat resisting temperature, compressive resistance 0.125MPa.
Embodiment 4
The preparation method of silica aerogel presoma is：
(1) mixed solution of silicon source and solvent is prepared
It takes several 3.5 waterglass that rub to be fitted into reaction kettle, the deionized water of 2.5 times of quality is used in combination to be diluted, 120 revs/min
Clock stirs 30 minutes, through 200 mesh screens, obtains water glass solution.
(2) colloidal sol
6mol/L nitric acid is taken, nitric acid zirconates is added, and (in terms of zirconium oxide, the molar ratio with silica in water glass solution is 4:
100), (in terms of cerium oxide, the molar ratio with zirconium oxide is 4 to nitric acid cerium salt:100)；After mixing, spray is added to step
(1) water glass solution obtained, spray while, are quickly stirred with 2000 revs/min of speed, control ph until 5,
Spray time was controlled at 120 minutes；Obtain colloidal sol.
(3) gel
By the ammonia spirit of pH value 10.5, spray is added to colloidal sol obtained by step (2), with 1300 revs/min while spray
Speed quickly stirred, until pH value be 4.5 when stop spray, 180 minutes used times, obtain gel.
(4) aging
Reaction kettle continues stirring 8 hours with 20 revs/min of speed, and control reaction kettle inner gel temperature is 40 degrees Celsius；
(5) solvent is replaced
Displacement solvent (acetone, the n-hexane with the material same volume of aging are added while being stirred in reaction kettle
And heptane, weight respectively account for the mixture of one third), to displace remaining moisture.
(6) surface modification
The coupling agent with the material same volume of aging is added in reaction kettle；The coupling agent be phenyl triethoxysilane,
Phenyltrimethoxysila,e, methyl trimethoxy oxygroup alkane weight respectively account for the mixture of one third, and by stirring 60 minutes, surface was repaiied
The silica aerogel presoma for being coated with displacement solvent and coupling agent is obtained after decorations.
The preparation method of solid-state silica aerogel, includes the following steps：The silicon airsetting of displacement solvent and coupling agent will be coated with
Glue presoma carries out micro-wave vacuum, and nitrogen catches up with oxygen to oxygen content to be less than 3% in drying kettle, and negative pressure 0.10MPa, 100 is Celsius
Degree, microwave frequency control in the range of 2450MHZ ± 10MHZ, 30 minutes, obtain the silica aerogel solid powder of toughening.
After testing, average pore size 24nm, specific surface area is 558 ㎡/g, loose specific weight 0.061g/cm to product3, it is super-hydrophobic,
Fire-retardant, thermal coefficient 0.0196W/MK, 729 DEG C of heat resisting temperature, compressive resistance 0.121MPa.
Embodiment 5
Nano-titanium oxide and the preparation method of aerogel particles of rare earth solid solution bluk recombination are：
Rare earth nitrades are selected as cerous nitrate, and aerogel particles select aerogel particles prepared by embodiment 1；
(1) aerogel particles are sieved through 300 mesh, and being soaked in 20 ° of ammonium hydroxide, (liquefied ammonia content is 20%, 80%) pure water content is
Middle 30h referred to as expects that A is spare, by cerous nitrate with 1：1 weight ratio is dissolved in deionized water, spare after filtering to be known as material B；
(2) by the mixed solution of titanium sulfate weight ratio 25kg (20% oxide meter) and deionized water 500kg, while stirring
75 DEG C are heated to, constant temperature, speed of agitator control is kept to open ultrasonic vibration, the frequency of ultrasonic vibration while 580 revs/min
F is 35KHz, and power density P is 0.3W/cm2, silica aerogel (material A) 4.3kg is at the uniform velocity added in 60 minutes, is reacted after adding
30min；The frequency of ultrasonic vibration is 27KHz, power density 0.6W/cm in step (2)；
(3) appropriate ammonium hydroxide is added, and (pH value of system is adjusted to 8.3 by a concentration of 20%), is then stirred with 40 revs/min
Speed stirring is mixed, stirring while opens ultrasonic vibration；Reaction 60 minutes, obtains slurry C；The frequency of ultrasonic vibration in step (3)
Rate is 32KHz, power density 0.4W/cm；
(4) slurry C is filtered, washed, it is 7.5 to make the pH value of slurry C, and filter material makes solid content be 42%；It is added
325kg deionized waters, while the material B of 0.23kg is added, speed of agitator is controlled at 600 revs/min, when stirring is warming up to 75 DEG C,
Ammonium hydroxide tune pH value 7.3 is added dropwise, hydrogen peroxide 23mL is added, is stirred to react 30 minutes；After washing, filtering, material solid content is 45%,
Obtain slurry D；
(5) slurry D is spray-dried, dry 260 DEG C of inlet temperature, 105 DEG C of outlet temperature.It shakes subsequently into tubular type
Stove is swung, heating temperature is set to 500 DEG C in stove, and the titanium hydroxide/cerium for being coated on aeroge surface is made to be converted into nano-scale anatase
Titanium oxide/cerium, wherein 230 DEG C of spray drying inlet temperature used, 110 DEG C of outlet temperature in step (5)；Tubular type oscillation sintering
The angle of inclination of stove is 7 DEG C, and vibration frequency is 330 beats/min；Finally obtain the compound silicon gas of nano-titanium oxide/cerium solid solution
Gel particle.
Embodiment 6
Nano-titanium oxide and the preparation method of aerogel particles of rare earth solid solution bluk recombination are：
Rare earth nitrades are selected as lanthanum nitrate, and aerogel particles select aerogel particles prepared by embodiment 2；
(1) aerogel particles are sieved through 300 mesh, are soaked in 36h in 20 ° of ammonium hydroxide, referred to as expect that A is spare, by lanthanum nitrate with 1：1
Weight ratio is dissolved in deionized water, spare after filtering to be known as material B；
(2) by titanium sulfate weight ratio 28kg (content of titanium dioxide in titanium sulfate is 20%) with deionized water 500kg's
Mixed solution is heated to 78 DEG C while stirring, and constant temperature, speed of agitator control is kept to open ultrasound while 680 revs/min and shake
Dynamic, the frequency F of ultrasonic vibration is 35KHz, and power density P is 0.3W/cm2, and silica aerogel (material A) is at the uniform velocity added in 68 minutes
4.3kg reacts 20min after adding；The frequency of ultrasonic vibration is 25KHz, power density 0.5W/cm in step (2)；
(3) appropriate ammonium hydroxide is added, and (pH value of system is to be adjusted to 8.5 by a concentration of 20%), then with 50 revs/min
Mixing speed stirs, and stirring while opens ultrasonic vibration；Reaction 70 minutes, obtains slurry C；Ultrasonic vibration in step (3)
Frequency is 28KHz, power density 0.6W/cm；
(4) slurry C is filtered, washed, it is 7.8 to make the pH value of slurry C, after filter material solid content 45%；300kg is added
Deionized water, while the material B of 0.25kg is added, speed of agitator is controlled at 700 revs/min, when stirring is warming up to 78 DEG C, spray ammonification
Water tune pH value 7.5 is added hydrogen peroxide 25mL, is stirred to react 30 minutes；Washing, filtering, material solid content 42%, obtain slurry D；
(5) slurry D is spray-dried, dry 280 DEG C of inlet temperature, 110 DEG C of outlet temperature.It shakes subsequently into tubular type
Stove is swung, heating temperature is set to 480 DEG C in stove, and the titanium hydroxide/lanthanum for being coated on aeroge surface is made to be converted into nano-scale anatase
Titanium oxide/lanthanum, wherein 280 DEG C of spray drying inlet temperature used, 110 DEG C of outlet temperature in step (5)；Tubular type oscillation sintering
The angle of inclination of stove is 7 DEG C, and vibration frequency is 360 beats/min；Finally obtain the silicon gas of nano-titanium oxide/lanthanum solid solution bluk recombination
Gel particle.
Embodiment 7
Nano-titanium oxide and the preparation method of aerogel particles of rare earth solid solution bluk recombination are：
Rare earth nitrades select neodymium nitrate, aerogel particles to select aerogel particles prepared by embodiment 3；
(1) aerogel particles are sieved through 300 mesh, are soaked in 40h in 20 ° of ammonium hydroxide, referred to as expect that A is spare, by lanthanum nitrate with 1：1
Weight ratio is dissolved in deionized water, spare after filtering to be known as material B；
(2) it by the mixed solution of titanium sulfate 30kg (20% oxide meter) and deionized water 500kg, is heated to while stirring
82 DEG C, constant temperature, speed of agitator control is kept to open ultrasonic vibration while 720 revs/min, the frequency F of ultrasonic vibration is
35KHz, power density P are 0.3W/cm2, and silica aerogel (material A) 4.8kg is at the uniform velocity added in 73 minutes, is reacted after adding
10min；The frequency of ultrasonic vibration is 35KHz, power density 0.8W/cm in step (2)；
(3) appropriate ammonium hydroxide is added, and (pH value of system is to be adjusted to 8.8 by a concentration of 20%), then with 60 revs/min
Mixing speed stirs, and stirring while opens ultrasonic vibration；Reaction 65 minutes, obtains slurry C；Ultrasonic vibration in step (3)
Frequency is 35KHz, power density 0.8W/cm；
(4) slurry C is filtered, washed, it is 8.0 to make the pH value of slurry C, after filter material solid content 46%；300kg is added
Deionized water, while material B is added, 0.28kg, speed of agitator is controlled at 700 revs/min, when stirring is warming up to 78 DEG C, spray ammonification
Water tune pH value 7.5 is added hydrogen peroxide 26mL, is stirred to react 30 minutes；Washing, filtering, material solid content 45%, obtain slurry D；
(5) slurry D is spray-dried, dry 290 DEG C of inlet temperature, 110 DEG C of outlet temperature.It shakes subsequently into tubular type
Stove is swung, heating temperature is set to 550 DEG C in stove, and the titanium hydroxide/lanthanum for being coated on aeroge surface is made to be converted into nano-scale anatase
Titanium oxide/lanthanum, wherein 300 DEG C of spray drying inlet temperature used, 120 DEG C of outlet temperature in step (5)；Tubular type oscillation sintering
The angle of inclination of stove is 8 DEG C, and vibration frequency is 380 beats/min；Finally obtain the silicon gas of nano-titanium oxide/lanthanum solid solution bluk recombination
Gel particle.
Embodiment 8
Nano-titanium oxide and the preparation method of aerogel particles of rare earth solid solution bluk recombination are：
Rare earth nitrades are selected as lanthanum nitrate, and aerogel particles select aerogel particles prepared by embodiment 4；
(1) aerogel particles are sieved through 300 mesh, is soaked in 33h in 20 DEG C of ammonium hydroxide, obtain material A；By rare earth nitrades with
1:1 weight ratio is dissolved in deionized water, and material B is obtained after filtering；
(2) it is 5% that the weight ratio meter of titanium oxide is converted into titanium sulfate, is 95% by required titanium sulfate and weight ratio meter
Deionized water carry out being mixed and made into solution；Solution is carried out continuing to stir and be heated to 85 DEG C, constant temperature is kept, in 80 minutes
The material A that step (1) is produced at the uniform velocity is added, speed of agitator control opens ultrasonic vibration while 750 revs/min, is added material A's
Amount is determined by the weight of silica aerogel, and the weight of silica aerogel is 0.46 times of the weight that titanium oxide is converted into titanium sulfate；
The frequency of ultrasonic vibration is 20KHz, power density 0.3W/cm in step (2)；
(3) it is to be adjusted to 9.0 to continuously add appropriate ammonium hydroxide by pH value, then continues to stir with 50 revs/min of mixing speed
It mixes, stirring while opens ultrasonic vibration；Reaction 80 minutes, obtains slurry C；The frequency of ultrasonic vibration is in step (3)
20KHz, power density 0.3W/cm；
(4) slurry C is filtered, washed, the pH value for controlling slurry C is 7.5, while making consolidating for the slurry C after being filtered, washed
Content>40%；Then, its 2 times of deionized water is added, while material B is added, wherein material B middle rare earth nitrate is in terms of oxide
Weight be the 5% of titania weight, speed of agitator is controlled at 700 revs/min, and ammonium hydroxide tune is added dropwise when being warming up to 85 DEG C in stirring
PH value is 7.3, and hydrogen peroxide is added, and the addition of hydrogen peroxide is expect weight of the B middle rare earth nitrate in terms of oxide 10%, is stirred
Mix reaction 30 minutes；To material solid content after washing, filtering>When 40%, collects and obtain slurry D；
(5) slurry D is spray-dried, tubular type oscillation sintering furnace is entered after dry, adding in tubular type oscillation sintering furnace
Hot temperature is 550 DEG C, and the titanium hydroxide for being coated on silica aerogel surface is made to be converted into nano-scale anatase with rare-earth hydroxide
Titanium oxide and rare earth oxide solid solution, wherein 200 DEG C of spray drying inlet temperature used, outlet temperature 100 in step (5)
℃；The angle of inclination of tubular type oscillation sintering furnace is 5 DEG C, and vibration frequency is 300 beats/min；Finally obtain nano-titanium oxide with it is dilute
The aerogel particles of native oxide solid solution bluk recombination.
In embodiment 5-8, aerogel particles are purchased from nano high-tech Co., Ltd of Shaoxin City, and specific surface area reaches 600m2/
G, and the diatomaceous specific surface area of common carrier is 60m2/g；By entrusting third party (SGS companies) to measure, embodiment 5-8 institutes
The aerogel particles average grain diameter for obtaining nano oxidized titanium/rare earth solid solution bluk recombination is less than 30nm (200,000 times of electron microscopes),
93% or more is anatase titanium dioxide (metallographic microscope), average specific surface area ＞ 250m2/ g, average photocatalysis performance ＞ 95%.
It can be seen that nano-titanium oxide and the aerogel particles of rare earth solid solution bluk recombination prepared by the present invention have higher
Specific surface area, adsorption capacity is stronger, makes its catalytic performance higher.
Embodiment 9-16
The preparation method of photochemical catalyst for air V OC processing, includes the following steps：
(1) nano-titanium oxide and the silica aerogel powder of rare earth solid solution bluk recombination is taken to be put into sand mill and grind；Step (1)
In, the abrading-ball of the sand mill is the zirconium ball of a diameter of 0.8-2mm；
(2) binder is prepared with gravimetric method：
1. taking the bentonite and deionization of 10~65 parts by weight of sodium metasilicate, 10~40 parts by weight of potassium silicate, 5~30 parts by weight
It is stirred evenly after the mixing of 30~90 parts by weight of water；
2. 20~80 parts by weight of organic organosilicon-modified acrylic emulsion are added；3. 5~40 parts by weight of Ludox are added, stir
It mixes uniformly；Water content≤70% of Ludox,
4. 1~15 parts by weight of aluminum phosphate are added, stir evenly, adjusts pH value to 7-8；
5. adding 1~15 parts by weight of 1~10 parts by weight of coupling agent and coalescents, stir evenly, then with high speed point
Loose sand grinding machine is sanded, and prepares finely dispersed binder；
(3) nano-titanium oxide after grinding is dissolved with rare earth in the silica aerogel powder addition binder of bluk recombination and is stirred
After uniformly plus water mixes, nano-titanium oxide and the silica aerogel powder of rare earth solid solution bluk recombination, the weight of binder and the water of addition
Amount portion rate is 6-12:0.2-3:110-200 is made mixed slurry, is put into the impregnating bath equipped with air stirring；In impregnating bath
The method of air stirring is：Impregnating bath bottom equipped with mixed slurry is equipped with coil pipe, and the aperture of 0.2-1mm is provided at the top of coil pipe,
It is inflated into coil pipe with 2-6 kilograms of compressed air, realizes air stirring, air stirring is during step (3) implement
It cannot pause；Then cellular ceramic substrate is immersed in above-mentioned mixed slurry again；It takes out cellular ceramic substrate and uses air knife
After blowing out additional size, air knife number is 2 times；When high temperature sintering, 500 DEG C first are warming up to 5h in tunnel room, after keeping the temperature 1h
Freely cool down and the above-mentioned photochemical catalyst for air V OC processing is made.
It is as shown in table 1 that embodiment 9-16 prepares the process conditions used for the photochemical catalyst of air V OC processing.
The process conditions that 1 embodiment 9~16 of table is used for the photochemical catalyst of air V OC processing
The component for being used for the photochemical catalyst that air V OC is handled prepared by above-mentioned process conditions is detailed as shown in table 2.
Component of 2 embodiment 9~16 of table for the photochemical catalyst of air V OC processing is detailed
Component in embodiment 9~16 for the binder of the photochemical catalyst of air V OC processing is detailed as shown in table 3.
In 3 embodiment 9~16 of table in binder each component detailed list of usage
Wherein, one or both of coupling agent KH560, TM-12；Coalescents are alcohol ester 12, butyl glycol ether
One
Kind or two kinds.
The parameter detail list of the coupling agent, Ludox, organosilicon-modified acrylic emulsion that are used in 4 embodiment 9~16 of table
Two, performance detection
1, photocatalysis effect measures
(1) with 1cm cuvettes the absorbance of the methylene blue solution of various concentration is measured using blank solution as reference.With
Standard curve is drawn in Absorbance versus concentration mapping.
(2) light degradation is tested
1. checking illumination system, constant temperature is at 20 DEG C.
2. methylene blue solution to be degraded is placed in 1000mL beakers (a concentration of 200ppm).This solution is to simulate
Natural water-like containing methylene blue.
3. the beaker equipped with simulation methylene blue water sample is placed in thermostat, carried out under mercury lamp (400w) irradiation real
It tests.A sample is taken every 10min, takes 5.0mL every time, takes 4 samples (being sampled respectively in t=0,10,20,30min) altogether.Point
It is not placed in numbered 25mL volumetric flasks, absorbance is measured according to method identical with step 1.
4. separately 5.0mL is taken to wait for degradation solution, sample, develop the color in t=10,30min, constant volume, colorimetric measures absorbance.
(3) by checking in the concentration value corresponding to different time light degradation Phenol in Aqueous Solution on standard curve, ln-t is drawn
Relation curve acquires rate of photocatalytic oxidation.
2, stability test：Test its photochemical catalyst effect outside the photochemical catalyst room prepared using the present invention after 1 month again
Fruit judges the stability of photocatalysis effect, and the number of the sample of every group of test is 10, the photochemical catalyst effect after calculating 1 month
95% photochemical catalyst that fruit (rate of photocatalytic oxidation) is still maintained at initial catalyst effect accounts for obtain ratio, is urged with this to weigh light
Change the stability of effect.
3, service life is tested
The catalytic effect of catalyst after testing 3 years, if the catalytic effect of catalyst of the catalyst after 3 years is still maintained at just
The 50% of beginning catalytic effect, then it is assumed that the service life ＞ of this photochemical catalyst 3 years.
4, light transmittance is tested
The light transmittance of catalyst solid powder is tested using spectrophotometer.
5, porosity and specific surface area test
Using BET methods of testing, porosity and the specific surface area test of catalyst solid powder are tested
The performance test results of catalyst corresponding to 9-16 of the embodiment of the present invention are as shown in table 5.
The performance test results of catalyst corresponding to 5 embodiment 9-16 of table
It can be seen that the photocatalysis effect of the photochemical catalyst for air V OC processing of the present invention：Rate of photocatalytic oxidation
>=90.8g/30min, stability >=99.84%, service life >=3 year, light transmittance >=90%, porosity of=75%, specific surface
Product >=500m2/g.Nano-titanium oxide is attached in the specific surface of silica aerogel micropore by the present invention, and silica aerogel is made not only to have
Absorption captures the function of the gaseous pollutants such as formaldehyde in air, and can rely on the anatase type titanium oxide for being carried on its surface
The gaseous pollutant captured by absorption is decomposed in photocatalysis；Harmful gas is adsorbed in no light, catalytic decomposition release when having light
The innocuous gas and moisture content being converted；I.e. silica aerogel has nano level microcellular structure, in pollution air and nanoscale
Titanium has carried out pollution air before being contacted the screening of one early period, keeps the pernicious gases such as formaldehyde, toluene and nanometer grading
Enter silica aerogel micropore and titanium oxide occur catalysis react, avoid titanium oxide be chronically exposed to pollution air in generation " in
Poison " and the case where cause to fail；The present invention is by the screening function and nanometer early period of the nano micropore structure of silica aerogel
The advantages of catalysis of grade anatase type titanium oxide, rolls into one, and realizes long-actingization and potentization of the material catalysis.
Claims (6)
1. a kind of photochemical catalyst for air V OC processing, it is characterized in that：The photochemical catalyst includes cellular ceramic substrate, receives
The silica aerogel powder and binder of rice titanium oxide and rare earth solid solution bluk recombination, the mass ratio 6-12 of three:0.2-3:110-
200；Nano-titanium oxide and the silica aerogel of rare earth solid solution bluk recombination are supported on micropore ceramics by the cementation of binder and carry
On body；The pore diameter range of the cellular ceramic substrate is 800nm-3200nm, the silicon of nano-titanium oxide and rare earth solid solution bluk recombination
The grain size of aerogel powder is 700-1300nm；
Aerogel particles need to prepare by aerogel precursor body, and the preparation method of aerogel precursor body is：
（1）Prepare the mixed solution of silicon source and solvent
The sodium metasilicate for several 3.0-4.0 that rub is taken to be fitted into reaction kettle, the deionized water that 1-3 times of sodium metasilicate quality is added is diluted,
Reaction kettle is stirred 30 minutes with 80-200 revs/min of speed, through 200 mesh screens, obtains sodium silicate solution；
（2）Colloidal sol
It takes A sour, A acid metal salts is added in A acid and rare earth A hydrochlorates are added in a manner of spray to step after mixing
（1）Obtained sodium silicate solution；The material in reaction kettle is carried out quickly with 1200-2000 revs/min of speed while spray
Stirring, the pH value for controlling sodium silicate solution is 1.5-3.0, obtains colloidal sol；
（3）Gel
Sodium hydroxide or ammonium hydroxide are taken, it is 10-11.5 that deionized water, which is added, and is diluted to pH value, is added in a manner of spray to reaction kettle
In；The material in reaction kettle is quickly stirred with 1200-2000 revs/min of speed while spray, when object in reaction kettle
When the pH value of material is 4.5-5.5, spray is terminated, gel is obtained；
（4）Aging
Stirring 3-10 hours is continued with 20-50 revs/min of speed in reaction kettle, aging, control are carried out to the material in reaction kettle
Material in reactor temperature is 35-50 degrees Celsius；
（5）Solvent is replaced
It carries out continuing stirring 60-180 minutes, while addition and step in reaction kettle（4）Aging material same volume in reaction kettle
Displacement solvent, to displace remaining moisture；
（6）Surface modification
It carries out continuing stirring in reaction kettle, while continuously adding and step（4）The coupling of aging material same volume in reaction kettle
Agent；By stirring 60-180 minutes, the silica aerogel presoma for being coated with displacement solvent and coupling agent is obtained；
Step（2）In, the A acid is sulfuric acid, hydrochloric acid, oxalic acid or nitric acid, and 6-15mol/L is adjusted to deionized water；The A acid
Metal salt is A acid zirconates or A acid aluminium salts；The rare earth A hydrochlorates are A acid cerium salt, A acid yttrium salt or A acid lanthanum salts.
2. the photochemical catalyst according to claim 1 for air V OC processing, which is characterized in that the porous ceramics carries
Body is porous cordierite carrier, vermiculite ceramic monolith or diatomite ceramic monolith；The shape of the cellular ceramic substrate is four directions
Body or column, the hole on carrier are cellular or grid-like；
Nano-titanium oxide and the preparation method of aerogel particles of rare earth solid solution bluk recombination are：
(1) aerogel particles are sieved through 300 mesh, is soaked in 20°30~36h in C ammonium hydroxide obtains material A；By rare earth nitrades with
1:1 weight ratio is dissolved in deionized water, and material B is obtained after filtering；
(2) weight ratio meter of titanium oxide is converted into as 5% with titanium sulfate, required titanium sulfate and weight ratio meter is gone for 95%
Ionized water carries out being mixed and made into solution；Solution is carried out continuing to stir and be heated to 75~90 DEG C, constant temperature is kept, at 60~90 points
The material A that step (1) is produced at the uniform velocity is added in clock, speed of agitator control opens ultrasonic vibration while 500~800 revs/min,
The amount that material A is added is determined by the weight of silica aerogel, and the weight of silica aerogel is that the weight of titanium oxide is converted into titanium sulfate
0.36~0.5 times；
(3) continuously add appropriate ammonium hydroxide by pH value be adjusted to 8.0~9.5, then with 30~80 revs/min of mixing speed after
Continuous stirring, stirring while, open ultrasonic vibration；Reaction 60~90 minutes, obtains slurry C；
(4) slurry C is filtered, washed, the pH value for controlling slurry C is 7~8, while consolidating for the slurry C after being filtered, washed being made to contain
Amount>40%；Then, its 2 times of deionized water is added, while material B is added, wherein material B middle rare earth nitrate is in terms of oxide
Weight is the 3~7% of titania weight, and speed of agitator is controlled at 500~800 revs/min, when stirring is warming up to 75~90 DEG C,
It is 7~7.5 that ammonium hydroxide tune pH value, which is added dropwise, and hydrogen peroxide is added, and the addition of hydrogen peroxide expects B middle rare earth nitrate in terms of oxide
The 10% of weight is stirred to react 30 minutes；To material solid content after washing, filtering>When 40%, collects and obtain slurry D；
(5) slurry D is spray-dried, tubular type oscillation sintering furnace, the heating temperature in tubular type oscillation sintering furnace is entered after dry
Degree is 450~600 DEG C, and the titanium hydroxide for being coated on silica aerogel surface is made to be converted into nano-scale anatase with rare-earth hydroxide
Titanium oxide and rare earth oxide solid solution finally obtain nano-titanium oxide and the compound silica aerogel light of rare earth oxide solid solution
Catalyst.
3. the photochemical catalyst according to claim 2 for air V OC processing, which is characterized in that the rare earth in step (1)
Nitrate is lanthanum nitrate, cerous nitrate or neodymium nitrate；
The frequency of ultrasonic vibration is 20~35KHz in step (2) or step (3), and power density is 0.3~0.8W/cm；
200~300 DEG C of spray drying inlet temperature used, 100~120 DEG C of outlet temperature in step (5)；
The angle of inclination of tubular type oscillation sintering furnace is 5~8 DEG C in step (5), and vibration frequency is 300~380 beats/min.
4. the photochemical catalyst according to claim 1 for air V OC processing, which is characterized in that step（2）In, the A
In terms of oxide, the molar ratio of the two is 100 for acid metal salt and rare earth A hydrochlorates:1-6；The oxide and sodium metasilicate of A acid metal salts
The molar ratio 2-5 of middle silica:100.
5. the photochemical catalyst according to claim 1 for air V OC processing, it is characterised in that：By the silicon airsetting of preparation
Glue presoma is put into drying kettle, and nitrogen is filled in drying kettle and catches up with oxygen, until oxygen content is less than 3% in drying kettle, then to drying
Material in kettle carries out micro-wave vacuum；Negative pressure 0.08-0.12MPa in drying kettle, temperature 85-135°C is made after dry
The silica aerogel of solid powder.
6. the photochemical catalyst according to claim 1 for air V OC processing, it is characterised in that：The binder, according to
Parts by weight meter includes the deionization of the sodium metasilicate of 10~65 parts by weight, the potassium silicate of 10~40 parts by weight, 30~90 parts by weight
Water, the Ludox of 5~40 parts by weight, the aluminum phosphate of 1~15 parts by weight, the coupling agent of 1~10 parts by weight, 1~15 parts by weight
Coalescents, the bentonite of 5~30 parts by weight, 20~80 parts by weight organosilicon-modified acrylic emulsions.
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| CN109046011A (en) * | 2018-08-28 | 2018-12-21 | 禤俊杰 | Air purifier based on nano-catalytic oxidation |
| CN109129782B (en) * | 2018-09-30 | 2020-04-24 | 浙江净威环境科技有限公司 | Spray for quickly releasing formaldehyde in board |
| CN109772146B (en) * | 2019-03-11 | 2021-09-03 | 广东顺德佑力电气科技有限公司 | Air purification material and preparation method and application thereof |
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