CN104209145B - Nanometer spherical porous weak light photocatalyst for degrading formaldehyde, and preparation method and application thereof - Google Patents
Nanometer spherical porous weak light photocatalyst for degrading formaldehyde, and preparation method and application thereof Download PDFInfo
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- CN104209145B CN104209145B CN201410252388.4A CN201410252388A CN104209145B CN 104209145 B CN104209145 B CN 104209145B CN 201410252388 A CN201410252388 A CN 201410252388A CN 104209145 B CN104209145 B CN 104209145B
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Abstract
The invention discloses a nanometer spherical porous weak light photocatalyst for degrading formaldehyde, and a preparation method and an application thereof. The photocatalyst comprises 0.2-30wt% of a titanium source, 60-99wt% of an alcohol solvent, 0.005-0.01wt% of a hydrolysis inhibitor, 0.005-0.01wt% of metal ion-containing deionized water, 10-40wt% of hydroxy group-containing mediate strong acid, and 1-5wt% of inorganic dispersant-containing deionized water, and the hydroxy group-containing mediate strong acid contains SiO2 crystal seeds; and the photocatalyst is a transparent sol liquid of nanoparticles, the particle size of the transparent sol liquid is 10-30nm, the surface of the photocatalyst is spherical porous distribution, and the specific surface area of the photocatalyst is large, and is above 300m＜2＞/g averagely. The photocatalyst has the advantages of mild production preparation conditions, small production safety risk, easy realization of batch production, weak light catalytic purification and high stability, and solves the problems of strict preparation conditions, low sunshine utilization rate, low air purifying and degrading efficiency, large base material apparent influence, construction inconvenience and the like of present mature photocatalyst products.
Description
Technical field
The present invention relates to photocatalyst technology field, the spherical porous low light level light of the more particularly, to a kind of nanometer for degradation of formaldehyde
Catalyst, preparation method and applications.
Background technology
Current environment pollution problem highlights, and especially the living environment seriously threatening the mankind in the large area of haze,
Surrounding air is administered very urgent.Photocatalyst, as a kind of emerging environment-friendly materials of suitable air cleaning, obtains more and more extensive
Research.But prior art mostly is laboratory research and development product, and with ultraviolet light or visible ray for energy excitation source, application aspect with
Based on water pollutant is administered, the product being actually used in formaldehyde pollutants degraded is almost blank, and the main harm of formaldehyde shows as
To Mucocutaneous stimulation, when formaldehyde reaches finite concentration indoors, people just has sense of discomfort, dense more than the formaldehyde of 0.08m
Degree can cause furious, ophthalmic pruritus, throat discomfort or pain, hoarseness, sneeze, uncomfortable in chest, asthma, dermatitis etc., newly-decorated room
Content of formaldehyde is higher, is the main inducing of numerous diseases, is also the small molecule gas forming haze simultaneously.Therefore, environment
The improvement of middle formaldehyde is very urgent.Additionally, existing photocatalyst product is mostly powder body and opaque or translucent suspension,
Not only have influence on base material apparent, and ripe photocatalyst product has that preparation condition is harsh, sun light utilization efficiency is low, air at present
Purification degradation efficiency is low, be unfavorable for that the problems such as manufacture, store and construct is solved.
Patent cn101486867a adopts nano titanium oxide, nanometer titanium phosphate, nano silicon, nanometer anion powder
Coordinate other building coating emulsions, defoamer, coupling agent, dispersant and the composition building coating such as thickening agent, water, for eliminating
The air pollution gas such as indoor formaldehyde, tvoc, benzene, ammonia.The materials such as the thickening agent of this method compounding use, defoamer and coupling agent are equal
Containing a certain amount of organic principle, whether environment is caused secondary pollution be worth discussion, be also not suitable in some transparency requirement
High occasion uses.
Patent cn102029168a discloses a kind of preparation method of nano titanyl pyrophosphate photocatalyst.The patented product is in
White powdery solid, mainly for the application of organic pollutant wastewater field of purification, the purification applying to air field is still needed solution
The certainly key issue such as load, film forming.
Japanese Unexamined Patent Publication 2004-180195a, with titanium tetrachloride as titanium source, is prepared for the amorphous state phosphoric acid with one-dimentional structure
Titanium photocatalyst, water white transparency, the degraded for pollutant such as Sulfide in Air, nitrogen oxides and voc purifies, also can be used as anti-
Bacterium, antibacterial material use.This product has high demands to actually used spray processing, and spraying is once sagging, after film forming easily
Form white opactitas powder of detached, strong influence base material is apparent.
There is following defect in therefore existing maturation photocatalyst product:
Existing nano titanium oxide dispersion shortcoming:
1) catalytic degradation target is most aims at water pollutant, and on-airborne polluter；
2) take " passive exposure degraded " pattern, light strong dependency is big, " having light to work, unglazed shut-down ", low light condition is several
There is no degradation effect, overall clean-up effect is low；
3) production equipment and condition require harsh, high cost, and efficiency is low, and industrialization is difficult；
4) through high-sintering process, powdered product form greatly limits its application and scope to majority；
5) load complex forming technology, film forming adhesive force is not high, easy powder of detached, it is impossible to reach the apparent requirement of base material, becomes
Unavoidably there is organic substance in point, there is secondary pollution risk.
Content of the invention
For weak point present in above-mentioned technology, the present invention provides a kind of room temperature preparation, low light level catalytic purification, stablizes
Property high and construction be simply to nanometer spherical porous low light level photocatalyst, the preparation method and applications of degradation of formaldehyde.
For achieving the above object, the present invention provides a kind of nanometer for degradation of formaldehyde spherical porous low light level photocatalyst, presses
Percentage by weight meter includes following raw material: titanium source 0.2%-30%, alcohols solvent 60%-99%, hydrolysis inhibitor 0.005%-0.01%,
Strong acid 10%-40%, the deionized water containing inorganic dispersant in the deionized water 0.005%-0.01% of metal ion, hydroxyl
1%-5%, in this hydroxyl, strong acid is contained within sio2Crystal seed；This photocatalyst is nano-particle vitreosol liquid, and its particle diameter distribution
Between 10-30nm, surface is the distribution of spherical cellular, and specific surface area is big and average out to 300m2/ more than g.
Wherein, this photocatalyst includes following raw material by weight percentage: titanium source 11%-30%, alcohols solvent 60%-70%,
Strong acid 15%-40% in hydrolysis inhibitor 0.008%-0.01%, the deionized water 0.008%-0.01% of metal ion, hydroxyl,
Deionized water 2.5%-5% containing inorganic dispersant.
Wherein, this photocatalyst includes following raw material: titanium source 15%, alcohols solvent 60%, hydrolysis suppression by weight percentage
Agent 0.01%, the deionized water 0.01% of metal ion, strong acid 21%, the deionized water containing inorganic dispersant in hydroxyl
3.98%.
For achieving the above object, the present invention also provides a kind of nanometer for degradation of formaldehyde spherical porous low light level photocatalyst
Preparation method is it is characterised in that comprise the following steps:
Step 1, the titanium source of 0.2%-30% is mixed with the alcohols solvent of 60%-99%, forms mixed liquor；
Step 2, the hydrolysis inhibitor of 0.005%-0.01% is added in mixed liquor, carries out violent stirring and synchronization is slow
The deionized water of metal ion of instillation 0.005%-0.01% after formed colloidal sol；
Step 3, stops stirring this colloidal sol and being aged the transparent light blue gel of formation；
Step 4, will contain sio under normal temperature condition2In the hydroxyl of the 10%-40% of crystal seed, strong acid slowly adds gel
In, and carry out dispergation and reaction after, obtain clear solution；
Step 5, clear solution is added to containing in 1%-5% deionized water containing inorganic dispersant, and after stirring
Obtain concentrated solution；
Step 6, adds alkali liquor to carry out ph regulation, range of accommodation is between 2-9, and obtains nanometer after dilution in concentrated solution
Granule vitreosol liquid, between 10-30nm, surface is spherical cellular distribution to its particle diameter distribution, and specific surface area is big and average
Reach 300m2/ more than g.
Wherein, described titanium source is appointing in tetrabutyl titanate, titanium tetrachloride, titanous chloride., titanyl sulfate or tetraethyl titanate
Meaning is a kind of；Carbon containing quantity 1-4 in described alcohols solvent, and for dehydrated alcohol, normal propyl alcohol, isopropanol, n-butyl alcohol, sec-butyl alcohol or
Any one in isobutanol.
Wherein, the metal ion in the deionized water of described metal ion be bismuth ion, chromium ion, calcium ion, sodium from
Any one in son, potassium ion.
Wherein, in described hydroxyl strong acid be oxalic acid, boric acid, dust technology, phosphoric acid, any one in formic acid.
Wherein, described inorganic dispersant is sodium pyrophosphate, sodium hexameta phosphate, poly- hydroxyl sodium, calcium carbonate, magnesium calcium carbonate
In any one；Described hydrolysis inhibitor is glacial acetic acid ester, acetylacetone,2,4-pentanedione, concentrated hydrochloric acid, any one in concentrated nitric acid.
Wherein, described alkali liquor be sodium hydroxide, calcium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, in strong aqua ammonia
Any one.
For achieving the above object, the present invention also provides a kind of application of nanometer spherical porous low light level photocatalyst, by above-mentioned system
Application in degradation of formaldehyde for the nanometer spherical porous low light level photocatalyst that Preparation Method obtains.
Compared with prior art, provided by the present invention for the nanometer spherical porous low light level photocatalyst of degradation of formaldehyde, preparation
Method and its application, the method have the advantages that
1) photocatalyst of the present invention is nano-particle vitreosol liquid, long term storage can not produce precipitation, convenient construction, and
Film forming adhesive force is good, becomes film hardness high, will not powder of detached, water white transparency, the apparent true qualities of base material can be kept, be suitable in all kinds of bases
Material surface construction operation, range expands；
2) surface of this photocatalyst is spherical cellular distribution, and specific surface area is big and more than average out to 300m2/g is so that be somebody's turn to do
Photocatalyst has big average specific surface area, due to strong adsorption effect, pollutes the formation of thing local concentration gradients, accelerates
Photocatalyst and the contact frequency of pollutant, realize the active purification of material；And great specific surface area, change traditional photocatalyst
" passive exposure degraded " pattern, the working method being combined using " actively+passive " both of which, realize round-the-clock purifying fall
Solution, raising efficiency；
3) it is inorganic nano component entirely in this component, environmental friendliness, non-secondary pollution, can enter to the formaldehyde of in the air in time
Row degraded, and degradation rate becomes big with the increase of this photocatalyst concentration；
4) with colloidal sol, gel and with strong acid in hydroxyl carry out dispergation, dilution technique for synthesize main points, realize the normal of product
Temperature produces and directly applies；
5) in processing technology using the deionized water of metal ion it is achieved that mixing of metal ion, naturally visible
Light utilization efficiency is lifted, and under low light condition, degradation effect is obvious；
6) in preparation method can according to occasion need select concentration and ph value it is achieved that acid-base value and ph value are adjustable,
The restriction of use occasion can be broken away from；
7) this photocatalyst produce that preparation condition is gentle, production safety risk is little, easily realize volume production, low light level catalytic purification, steady
Qualitative height, emphasis is for ripe photocatalyst product preparation condition is harsh, sun light utilization efficiency is low, air cleaning degradation efficiency at present
Low, base material apparent effect is big, construction is solved the problems such as inconvenient.
Brief description
Fig. 1 is the flow chart of the preparation method of the spherical porous low light level photocatalyst of the nanometer for degradation of formaldehyde of the present invention.;
Fig. 2 is the curve chart of the concentration degraded of formaldehyde in experimental example one；
Fig. 3 is the curve chart of the concentration degraded of formaldehyde in experimental example two；
Fig. 4 is the curve chart of the concentration degraded of formaldehyde in experimental example three.
Specific embodiment
In order to more clearly state the present invention, below in conjunction with the accompanying drawings the present invention is further described.
Nanometer for the degradation of formaldehyde spherical porous low light level photocatalyst of the present invention, includes following former by weight percentage
Material: titanium source 0.2%-30%, alcohols solvent 60%-99%, hydrolysis inhibitor 0.005%-0.01%, the deionized water of metal ion
Strong acid 10%-40%, the deionized water 1%-5% containing inorganic dispersant in 0.005%-0.01%, hydroxyl, in strong acid in this hydroxyl
Containing sio2Crystal seed；This photocatalyst is nano-particle vitreosol liquid, and its particle diameter distribution is between 10-30nm, and surface is ball
Shape cellular is distributed, and specific surface area is big and average out to 300m2/ more than g.
In the present embodiment, this photocatalyst includes following raw material: titanium source 11%-30%, alcohols solvent by weight percentage
Strong acid in 60%-70%, hydrolysis inhibitor 0.008%-0.01%, the deionized water 0.008%-0.01% of metal ion, hydroxyl
15%-40%, the deionized water 2.5%-5% containing inorganic dispersant.The optimal percentage by weight of this photocatalyst is calculated as: titanium source 15%, alcohol
Strong acid 21% in class solvent 60%, hydrolysis inhibitor 0.01%, the deionized water 0.01% of metal ion, hydroxyl, contain inorganic point
The deionized water 3.98% of powder.
Compared to the situation of prior art, the nanometer spherical porous low light level light provided by the present invention for degradation of formaldehyde touches
Matchmaker, has the advantage that
1) photocatalyst of the present invention is nano-particle vitreosol liquid, long term storage can not produce precipitation, convenient construction, and
Film forming adhesive force is good, becomes film hardness high, will not powder of detached, water white transparency, the apparent true qualities of base material can be kept, be suitable in all kinds of bases
Material surface construction operation, range expands；
2) surface of this photocatalyst is spherical cellular distribution, and specific surface area is big and more than average out to 300m2/g is so that be somebody's turn to do
Photocatalyst has big average specific surface area, due to strong adsorption effect, pollutes the formation of thing local concentration gradients, accelerates
Photocatalyst and the contact frequency of pollutant, realize the active purification of material；And great specific surface area, change traditional photocatalyst
" passive exposure degraded " pattern, the working method being combined using " actively+passive " both of which, realize round-the-clock purifying fall
Solution, raising efficiency；
3) it is inorganic nano component entirely in this component, environmental friendliness, non-secondary pollution, can enter to the formaldehyde of in the air in time
Row degraded, and degradation rate becomes big with the increase of this photocatalyst concentration.
Refer to Fig. 1, provided by the present invention for the preparation method of the nanometer spherical porous low light level photocatalyst of degradation of formaldehyde,
Comprise the following steps:
Step s1, the titanium source of 0.2%-30% is mixed with the alcohols solvent of 60%-99%, forms mixed liquor；Titanium in this step
Source is any one in tetrabutyl titanate, titanium tetrachloride, titanous chloride., titanyl sulfate or tetraethyl titanate, contains in alcohols solvent
Carbon number amount 1-4, and be any one in dehydrated alcohol, normal propyl alcohol, isopropanol, n-butyl alcohol, sec-butyl alcohol or isobutanol.
Step s2, the hydrolysis inhibitor of 0.005%-0.01% is added in mixed liquor, carries out violent stirring and synchronization is slow
Form colloidal sol after the slow deionized water of metal ion of instillation 0.005%-0.01%；In this step, hydrolysis inhibitor is glacial acetic acid
Any one in ester, acetylacetone,2,4-pentanedione, concentrated hydrochloric acid, concentrated nitric acid, in the deionized water of metal ion metal ion be bismuth ion,
Any one in chromium ion, calcium ion, sodium ion, potassium ion, certain metal ion can also be other ions such as iron ion.
Step s3, stops stirring this colloidal sol and being aged the transparent light blue gel of formation；In case the use of next step.
Step s4, will contain sio under normal temperature condition2In the hydroxyl of the 10%-40% of crystal seed, the slow addition of strong acid is solidifying
In glue, and carry out dispergation and reaction after, obtain clear solution；In hydroxyl strong acid be oxalic acid, nitric acid, any one in formic acid,
It is, of course, also possible to be other kinds of middle strong acid, this clear solution does not have loading problem, and film forming adhesive force is strong.
Step s5, clear solution is added to containing in 1%-5% deionized water containing inorganic dispersant, and after stirring
Obtain concentrated solution；Inorganic dispersant is sodium hexameta phosphate, poly- hydroxyl sodium, calcium carbonate, any one in magnesium calcium carbonate.
Step s6, adds alkali liquor to carry out ph regulation, range of accommodation is between 2-9, and is received after dilution in concentrated solution
Rice grain vitreosol liquid, between 10-30nm, surface is spherical cellular distribution to its particle diameter distribution, and specific surface area is big and flat
All reach 300m2/ more than g.Alkali liquor is sodium hydroxide, calcium hydroxide, potassium hydroxide, sodium bicarbonate, sodium carbonate, appointing in strong aqua ammonia
Meaning is a kind of, can according to occasion need concentrated solution carried out with ph value adjust, expand range.
The preparation method that the present invention provides, has the advantage that
1) photocatalyst that this method prepares is nano-particle vitreosol liquid, long term storage can not produce precipitation, apply
Work facilitates, and film forming adhesive force is good, becomes film hardness high, will not powder of detached, water white transparency, the apparent true qualities of base material can be kept, fit
It is combined in all kinds of substrate surface construction operations, range expands；
2) surface of this photocatalyst is spherical cellular distribution, and specific surface area is big and more than average out to 300m2/g is so that be somebody's turn to do
Photocatalyst has big average specific surface area, due to strong adsorption effect, pollutes the formation of thing local concentration gradients, accelerates
Photocatalyst and the contact frequency of pollutant, realize the active purification of material；And great specific surface area, change traditional photocatalyst
" passive exposure degraded " pattern, the working method being combined using " actively+passive " both of which, realize round-the-clock purifying fall
Solution, raising efficiency；
3) it is inorganic nano component entirely in this component, environmental friendliness, non-secondary pollution, can enter to the formaldehyde of in the air in time
Row degraded, and degradation rate becomes big with the increase of this photocatalyst concentration；
4) with colloidal sol, gel and with strong acid in hydroxyl carry out dispergation, dilution technique for synthesize main points, realize the normal of product
Temperature produces and directly applies；
5) in processing technology using the deionized water of metal ion it is achieved that mixing of metal ion, naturally visible
Light utilization efficiency is lifted, and under low light condition, degradation effect is obvious；
6) in preparation method can according to occasion need select concentration and ph value it is achieved that acid-base value and ph value are adjustable,
The restriction of use occasion can be broken away from；
7) this photocatalyst produce that preparation condition is gentle, production safety risk is little, easily realize volume production, low light level catalytic purification, steady
Qualitative height, emphasis is for ripe photocatalyst product preparation condition is harsh, sun light utilization efficiency is low, air cleaning degradation efficiency at present
Low, base material apparent effect is big, construction is solved the problems such as inconvenient.
The present invention also provides a kind of application of nanometer spherical porous low light level photocatalyst, the nanometer being obtained by above-mentioned preparation method
Application in degradation of formaldehyde for the spherical porous low light level photocatalyst, its application effect substantially, can pass through three below specific experiment example,
The application in degradation of formaldehyde for this photocatalyst is described:
Experimental example one
One, experimental technique:
1st, a certain amount of concentration is that 0.5% nano-particle vitreosol liquid sample is sprayed on 1 square metre of glass plate, puts
It is put in the formaldehyde gases being filled with a certain amount of normal concentration in 1.5 cubic metres of glass experiment bin under dark room conditions, and start storehouse
Interior air circulation pump, when in storehouse, concentration of formaldehyde stops being filled with formaldehyde standard gas when stablizing in 510ppb.After dark adsorption equilibrium
(process time is generally 0.5-1h, in storehouse gas concentration change less than 10ppb/h when be considered as dark adsorption equilibrium), afterwards
Concentration of formaldehyde in testing in three times in the 1.5h time, and record.After having tested, open daylight lamp (wave-length coverage 400- in storehouse
800nm) irradiate.Record a case concentration of formaldehyde every half an hour.
2nd, experimental situation: 20 DEG C of temperature, humidity 60rh%.
Two, record and draw curve
Initial data such as following table
3rd, degraded formula
4th, Fig. 2 is the curve chart of the concentration degraded of formaldehyde.
Experimental example two
One, experimental technique:
1st, a certain amount of concentration is that 0.2% nano-particle vitreosol liquid sample is sprayed on 1 square metre of glass plate, puts
It is put in the formaldehyde gases being filled with a certain amount of normal concentration in 1.5 cubic metres of glass experiment bin under dark room conditions, and start storehouse
Interior air circulation pump, when in storehouse, concentration of formaldehyde stops being filled with formaldehyde standard gas when stablizing in 510ppb.After dark adsorption equilibrium
(process time is generally 0.5-1h, in storehouse gas concentration change less than 10ppb/h when be considered as dark adsorption equilibrium), afterwards
Concentration of formaldehyde in testing in three times in the 1.5h time, and record.After having tested, open daylight lamp (wave-length coverage 400- in storehouse
800nm) irradiate.Record a case concentration of formaldehyde every half an hour.
2nd, experimental situation: 20 DEG C of temperature, humidity 60rh%.
Two, record and draw curve
Initial data such as following table
3rd, degraded formula
4th, Fig. 3 is the curve chart of the concentration degraded of formaldehyde.
Experimental example three
One, experimental technique:
1st, a certain amount of concentration is that 0.1% nano-particle vitreosol liquid sample is sprayed on 1 square metre of glass plate, puts
It is put in the formaldehyde gases being filled with a certain amount of normal concentration in 1.5 cubic metres of glass experiment bin under dark room conditions, and start storehouse
Interior air circulation pump, when in storehouse, concentration of formaldehyde stops being filled with formaldehyde standard gas when stablizing in 510ppb.After dark adsorption equilibrium
(process time is generally 0.5-1h, in storehouse gas concentration change less than 10ppb/h when be considered as dark adsorption equilibrium), afterwards
Concentration of formaldehyde in testing in three times in the 1.5h time, and record.After having tested, open daylight lamp (wave-length coverage 400- in storehouse
800nm) irradiate.Record a case concentration of formaldehyde every half an hour.
2nd, experimental situation: 20 DEG C of temperature, humidity 60rh%.
Two, record and draw curve
3rd, degraded formula
4th, Fig. 4 is the curve chart of the concentration degraded of formaldehyde.
By above-mentioned three experiments, obtaining it is concluded that 1) with nano-particle vitreosol liquid concentration increase, its
The concentration degradation rate of formaldehyde is higher；2) the concentration degradation rate of formaldehyde is in the Long-term change trend becoming larger;3) formaldehyde was being degraded
In journey, reaction equation is ch2o——co2+h2o.
The principle of degradation of formaldehyde of the present invention is as follows: in the in the air having a small amount of vapor, when energy exceedes photocatalyst forbidden band
In photocatalyst surface, the electrons of valence band are excited to conduction band to the photon irradiation of width, form highly active electronics in conduction band
E-, produces the hole h+ of a positively charged simultaneously in valence band, and the electron-hole pair producing after exciting is quickly from vivo migration to table
Face.
Under the reaction condition of formaldehyde in photocatalytic oxidation air, the oxygen of the in the air in photocatalyst surface for the absorption is by light
Raw electron reduction is o2-, minor amount of water is oh by Hole oxidation, and both are that the deep oxidation of formaldehyde provides highly active oxidant
o2- and oh attack the c h key of formaldehyde, the h atom active with it produces new free radical, excites chain reaction, so that formaldehyde is divided
Solve as h2O and co2.)
The several specific embodiments being only the present invention disclosed above, but the present invention is not limited to this, any ability
What the technical staff in domain can think change all should fall into protection scope of the present invention.
Claims (8)
1. a kind of spherical porous low light level photocatalyst of the nanometer for degradation of formaldehyde is it is characterised in that include by weight percentage
Following raw material: titanium source 0.2%-30%, alcohols solvent 60%-99%, hydrolysis inhibitor 0.005%-0.01%, metal ion go from
In sub- water 0.005%-0.01%, hydroxyl, strong acid 10%-40%, the deionized water 1%-5% containing inorganic dispersant, strong in this hydroxyl
Acid is contained within sio2Crystal seed；This photocatalyst is nano-particle vitreosol liquid, and its particle diameter distribution is between 10-30nm, surface
For the distribution of spherical cellular, specific surface area is big and average out to 300m2/ more than g；Gold in the deionized water of described metal ion
Genus ion is bismuth ion, chromium ion, calcium ion, sodium ion, any one in potassium ion, in described hydroxyl, strong acid is grass
Acid, boric acid, dust technology, phosphoric acid, any one in formic acid.
2. the spherical porous low light level photocatalyst of the nanometer for degradation of formaldehyde according to claim 1 is it is characterised in that this light
Catalyst includes following raw material: titanium source 11%-30%, alcohols solvent 60%-70%, hydrolysis inhibitor 0.008%- by weight percentage
0.01%th, the deionized water 0.008%-0.01% of metal ion, strong acid 15%-40% in hydroxyl, containing inorganic dispersant go from
Sub- water 2.5%-5%；Metal ion in the deionized water of described metal ion be bismuth ion, chromium ion, calcium ion, sodium from
Son, any one in potassium ion, in described hydroxyl strong acid be oxalic acid, any one in boric acid, dust technology, phosphoric acid, formic acid
Kind.
3. the spherical porous low light level photocatalyst of the nanometer for degradation of formaldehyde according to claim 1 is it is characterised in that this light
Catalyst includes following raw material: titanium source 15%, alcohols solvent 60%, hydrolysis inhibitor 0.01%, metal ion by weight percentage
Deionized water 0.01%, strong acid 21%, the deionized water 3.98% containing inorganic dispersant in hydroxyl；Described metal ion
Metal ion in deionized water is bismuth ion, chromium ion, calcium ion, sodium ion, any one in potassium ion, described containing hydroxyl
In base strong acid be oxalic acid, boric acid, dust technology, phosphoric acid, any one in formic acid.
4. a kind of preparation method of the spherical porous low light level photocatalyst of the nanometer for degradation of formaldehyde is it is characterised in that include following
Step:
Step 1, the titanium source of 0.2%-30% is mixed with the alcohols solvent of 60%-99%, forms mixed liquor；
Step 2, the hydrolysis inhibitor of 0.005%-0.01% is added in mixed liquor, carries out violent stirring synchronous slow
Form colloidal sol, the gold in the deionized water of described metal ion after the deionized water of the metal ion entering 0.005%-0.01%
Genus ion is bismuth ion, chromium ion, calcium ion, sodium ion, any one in potassium ion；
Step 3, stops stirring this colloidal sol and being aged the transparent light blue gel of formation；
Step 4, will contain sio under normal temperature condition2In the hydroxyl of the 10%-40% of crystal seed, strong acid slowly adds in gel, and
After carrying out dispergation and reaction, obtain clear solution, in described hydroxyl strong acid be oxalic acid, boric acid, dust technology, phosphoric acid, in formic acid
Any one；
Step 5, clear solution is added to containing in 1%-5% deionized water containing inorganic dispersant, and obtains after stirring
Concentrated solution；
Step 6, adds alkali liquor to carry out ph regulation, range of accommodation is between 2-9, and obtains nano-particle after dilution in concentrated solution
Vitreosol liquid, between 10-30nm, surface is the distribution of spherical cellular to its particle diameter distribution, and specific surface area is big and average out to
300m2/ more than g.
5. the preparation method of the spherical porous low light level photocatalyst of the nanometer for degradation of formaldehyde according to claim 4, it is special
Levy and be, described titanium source is any one in tetrabutyl titanate, titanium tetrachloride, titanous chloride., titanyl sulfate or tetraethyl titanate；
Carbon containing quantity 1-4 in described alcohols solvent, and be dehydrated alcohol, normal propyl alcohol, isopropanol, n-butyl alcohol, sec-butyl alcohol or isobutanol
In any one.
6. the preparation method of the spherical porous low light level photocatalyst of the nanometer for degradation of formaldehyde according to claim 4, it is special
Levy and be, described inorganic dispersant is sodium hexameta phosphate, poly- hydroxyl sodium, calcium carbonate, any one in magnesium calcium carbonate；Institute
State hydrolysis inhibitor be glacial acetic acid ester, acetylacetone,2,4-pentanedione, concentrated hydrochloric acid, any one in concentrated nitric acid.
7. the preparation method of the spherical porous low light level photocatalyst of the nanometer for degradation of formaldehyde according to claim 4, it is special
Levy and be, described alkali liquor is sodium hydroxide, calcium hydroxide, potassium hydroxide, sodium bicarbonate, sodium carbonate, any one in strong aqua ammonia
Kind.
8. the nanometer spherical porous low light level photocatalyst that the preparation method described in a kind of any one of claim 4-7 obtains, described receives
Application in degradation of formaldehyde for the spherical porous low light level photocatalyst of rice.
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| CN107158941B (en) * | 2017-06-22 | 2019-05-24 | 广西贝仕特环保科技有限公司 | One kind being used for indoor formaldehyde remover |
| CN110773207A (en) * | 2019-09-25 | 2020-02-11 | 陈红菊 | Cold catalyst material capable of completely decomposing formaldehyde at room temperature in absence of light and preparation method thereof |
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