CN100446861C - Indirect glomeration dispersedly fixed type nano titanium dioxide particle preparation method - Google Patents
Indirect glomeration dispersedly fixed type nano titanium dioxide particle preparation method Download PDFInfo
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- 239000002245 particle Substances 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims description 8
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 title description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 57
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 20
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- 238000000576 coating method Methods 0.000 claims abstract description 13
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- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 7
- 230000006837 decompression Effects 0.000 claims description 6
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 6
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- 238000002156 mixing Methods 0.000 claims description 5
- 238000002203 pretreatment Methods 0.000 claims description 5
- 229910021642 ultra pure water Inorganic materials 0.000 claims description 5
- 239000012498 ultrapure water Substances 0.000 claims description 5
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- LFQCEHFDDXELDD-UHFFFAOYSA-N tetramethyl orthosilicate Chemical compound CO[Si](OC)(OC)OC LFQCEHFDDXELDD-UHFFFAOYSA-N 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 230000001699 photocatalysis Effects 0.000 abstract description 9
- 238000004140 cleaning Methods 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 6
- 230000003197 catalytic effect Effects 0.000 abstract description 3
- 230000004913 activation Effects 0.000 abstract 1
- 230000000844 anti-bacterial effect Effects 0.000 abstract 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
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- 239000000975 dye Substances 0.000 description 5
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- 239000011368 organic material Substances 0.000 description 5
- 238000007146 photocatalysis Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
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- 239000000428 dust Substances 0.000 description 4
- 238000002389 environmental scanning electron microscopy Methods 0.000 description 4
- 239000005416 organic matter Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 229910018557 Si O Inorganic materials 0.000 description 2
- 230000003115 biocidal effect Effects 0.000 description 2
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- 230000008859 change Effects 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- FPVGTPBMTFTMRT-UHFFFAOYSA-L disodium;2-amino-5-[(4-sulfonatophenyl)diazenyl]benzenesulfonate Chemical compound [Na+].[Na+].C1=C(S([O-])(=O)=O)C(N)=CC=C1N=NC1=CC=C(S([O-])(=O)=O)C=C1 FPVGTPBMTFTMRT-UHFFFAOYSA-L 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
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- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 239000005715 Fructose Substances 0.000 description 1
- RFSUNEUAIZKAJO-ARQDHWQXSA-N Fructose Chemical compound OC[C@H]1O[C@](O)(CO)[C@@H](O)[C@@H]1O RFSUNEUAIZKAJO-ARQDHWQXSA-N 0.000 description 1
- 229930091371 Fructose Natural products 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- 229910003849 O-Si Inorganic materials 0.000 description 1
- 229910003872 O—Si Inorganic materials 0.000 description 1
- 201000010001 Silicosis Diseases 0.000 description 1
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- 231100000053 low toxicity Toxicity 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
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- 150000002894 organic compounds Chemical class 0.000 description 1
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Abstract
It relates to a none directly agglomerated scattered fixing nanometer Titania particles. It aims to protect the basic material, solve the contradiction of protecting organic carrier and retaining certain photo catalytic activation to solve the conflict of reducing catalytic activity as well as reducing power damage. It comprises the pretreatment of Titania nanometer particles, coating carbon around the surface of the nanometer particles, coating silica dioxide outside the carbon coated nanometer particles through sol and gel, and getting rid of the sandwiched carbon coating. It can be used for purifying air, water, antibacterial, self cleaning and many other areas.
Description
Technical field
The present invention relates to a kind of preparation method of dispersion fixed nano-titania particle of non-direct reunion.Nano-titania particle can decompose most organic matters, for example is applied to air cleaning, and water purifies, antibiotic and sterilizing, automatically cleaning etc. and the people closely bound up field of living.
Background technology
The generalized definition of nano particle reaches a nano level class particle for its particle size of general reference.And after its narrow sense is defined as particle size and reaches nanoscale, show and have different and the physics of general aggregate and a class particle of chemical property.
Nano-titania particle for example, owing to have strong photocatalysis, and paid close attention to widely by world institute.Because this particle is after being subjected to ultraviolet excitation, electronics is separated with positive cave, thereby has strong redox ability.This redox ability is so strong, even can interrupt c h bond, therefore can decompose most organic matters with it.And the function of this decomposing organic matter can derive some for example air cleanings, and water purifies, antibiotic and sterilizing, automatically cleaning etc. and the people closely bound up utility function of living.
But, when people attempt this nano particle is applied to but discovery in the reality, because the redox ability that it has is so strong, to such an extent as in decomposing organic matter, the organic carrier that will support it also decomposes simultaneously.For example, in order to obtain automatically cleaning and air-cleaning function, people sneak into this nano-photocatalyst in the wall covering, but along with the passage of time Exposure to Sunlight, break away from metope and produce the ashing phenomenon thereby titanium dioxide nano-particle can decompose coating.Be so limited, people can only support this nano-photocatalyst on the surface of not allowing labile inorganic matter, glass for example, materials such as pottery.This has restricted its practical application as a kind of superior photochemical catalyst widely.
In order to change this present situation, the researcher attempts to solve this problem by the surface modification of nano particle.Present most typical example is to superscribe layer of silicon dioxide to scheme playing protective layer between TiO 2 particles and organic carrier on the surface of nano particle by for example sol-gel process.But result of study shows; though use this method can play the effect of protection organic carrier, because silica is insulator, photic electronics or positive cave can't arrive the surface of stuff and other stuff; thereby cause the catalytic activity of particle to reduce greatly, the decomposing organic matter inefficiency.
In addition, in the practical application of nano particle, though there are not enough medical evidences, people have reason worry, are having a mind to or are sucking unintentionally or during the contact human body than the also small nano-grade matter of dust, for example whether can cause diseases such as silicosis.Studies show that, can reunite by making nano particle, the harm that the deadweight of raising nano particle alleviates dust, activity reduces but general method of agglomeration will certainly make nano particle.How solving this contradiction also is one of present hot research.
Summary of the invention
The technical problem to be solved in the present invention is: the preparation method that a kind of dispersion fixed nano-titania particle of non-direct reunion is provided; be intended to protect base material not to be damaged; solve the protection organic carrier and keep the contradiction of certain photocatalytic activity, and solve that utilizing reunites and reduce dust harzard and reunite and reduce the contradiction of catalytic activity simultaneously.
The technical solution adopted in the present invention is: a kind of preparation method of dispersion fixed nano-titania particle of non-direct reunion is characterized in that this method may further comprise the steps:
(a) TiO is used in the pre-treatment of titanium dioxide nano-particle
2Represent,
Commercially available nano titanium oxide at first must pass through following processing, increases its surperficial OH group, can increase the reactivity point of nano particle by this process, thereby helps the reaction of next step (b),
The titanium dioxide nano-particle of 100-500mg is added among the NaOH or HCl solution that concentration is 0.5-1.2mol/L, handle 7-14 hour with the rotating speed magnetic agitation of 500-1000rpm after, 35 washing-centrifugations are 7 stand-by to PH;
(b) process of nanoparticle surface parcel carbon is used C@TiO
2Represent,
This process is by hydro-thermal reaction, makes organic matter carry out even carbonization on the surface of nano particle, thereby forms the nano silicon carbide layer,
The nano particle 100-450mg that step (a) is made is added into the aqueous solution that concentration is the carbonaceous organic material that is dissolvable in water water of 0.7-2.2mol/L, after fully mixing mixed liquor is imported in the hydrothermal reaction kettle, in 150-200 ℃ of following heat treated 2-8 hour, reaction back with organic solvent washing 3-7 time after, with dried for standby after distillation washing 3-7 time;
(c) with the process of sol-gel process, use Si@C@TiO at the skin parcel silica of carbon parcel nano particle
2Represent,
This process plays two effects: at first, carry out the parcel of silica with sol-gel process at the skin of carbon parcel nano particle, purpose is the protective layer that forms silica; Secondly, make the particle through step (b) be wrapped up by silica institute integral body by decompression distillation, the deadweight that has improved nano particle,
(1) sample 100-450mg that step (b) is obtained and chloroform 5-15ml and ultra-pure water 200-700 μ l and acetone 3-7ml Jiao mixed 0.5-5 hour,
(2) dissolve methyl silicate (TMOS) or ethyl orthosilicate (TEOS) 0.1-2g in the ethanol solution of 5-20ml, Jiao mixed 0.5-5 hour,
(3) step (2) solution is added in step (1) solution, Jiao mixed 3-8 hour,
(4) after reaction finished, decompression distillation step (3) solution through 100-120 ℃, 3-5 hour drying under reduced pressure, ground after half-dried;
(d) process of removal interlayer carbon-coating is used Si@@TiO
2Represent,
This purpose of handling process is with high temperature carbon to be become the carbon-coating that carbon dioxide removes sandwich of layers, both protects organic carrier thereby play, and can keep certain photocatalytic activity again,
The sample that step (c) is obtained places the Muffle furnace sintering, 400-600 ℃ of control temperature, and time 3-8 hour, grind behind the sintering, promptly obtain end product.
The aqueous solution of the carbonaceous organic material that is dissolvable in water water described in the step (b) comprises polyvinyl alcohol resin (PVA) or polyethylene glycol (PEG) or sucrose glucides such as (Sucrose).
Organic solvent described in the step (b) comprises methyl alcohol or ethanol or acetone.
Polyvinyl alcohol resin (PVA) polyvinyl alcohol is a kind of purposes high molecular weight water soluble polymer quite widely; nontoxic; have characteristics such as unique strong cohesive property, flatness, oil resistivity, anti-dissolubility, gas barrier performance, wearability, protecting colloid; can make it have resistance to water through specially treated again; its aqueous solution has good film forming, emulsion stability, transparency height, adhesion strength is strong, moisture-proof good; its dissolubility improves with the reduction of alcoholysis degree, and protecting colloid characteristic, viscosity reduce with the reduction of the degree of polymerization.It is mainly used in and produces synthetic fibers, plastics, adhesive, coating, building material etc., and is widely used in industries such as chemical industry, weaving, printing, papermaking, process hides, agricultural, food, medicine, packing, pottery, electronics, cosmetic, building.
The generally water-soluble and multiple organic solvent of polyethylene glycol (PEG) series of products, be insoluble to aliphatic hydrocarbon, benzene, ethylene glycol etc., can hydrolytic spoilage, soluble end widely and good compatibility, well stability, lubricity, film forming, plasticity, dispersiveness etc. are arranged.Be low toxicity material, and nonirritant, non-ionic polyalcohol belonged to.
Sucrose (Sucrose) organic compound, molecular weight 180, molecular formula C
12H
22O
11, be to lose a part water by a part glucose and the condensation of a part fructose to form, clear crystal, soluble in water.Solubility in the water: every gram water can dissolve 2.1g sucrose (25 ℃).
Organosilicon material described in the step (c) comprises methyl silicate (TMOS) or ethyl orthosilicate (TEOS)
Methyl silicate (TMOS), molecular formula C4H12O4Si, molecular weight 152.22.Colourless liquid, water insoluble, can be miscible in most organic solvents.Be commonly used for the presoma of sol-gel process synthetic silica.
Ethyl orthosilicate (TEOS), molecular formula: C8H20O4Si, molecular weight: 208.33.Colourless liquid, scent of is slightly soluble in water slightly, is dissolved in ethanol, ether.Be commonly used for heat-resistant paint, the coating of chemically-resistant effect, organic synthesis intermediate, the presoma of sol-gel process synthetic silica.
The invention has the beneficial effects as follows: 1) the protection base material is not damaged, and has expanded the application of nano-titania particle as photochemical catalyst greatly; 2) do not influence the activity (being the functional of it) of nano particle; 3) change the dust characteristic of its nano particle by non-direct reunion, help protecting that environment and people's is healthy.
Description of drawings
Fig. 1 is the infrared spectrum of various nano-titania particles among the present invention.
Fig. 2 is the ESEM picture of untreated TiO2 (look white) among the present invention.
Fig. 3 is the ESEM picture of the C@TiO2 (look brown) that superscribes carbon among the present invention.
Fig. 4 is the ESEM picture of the Si@C@TiO2 (look brown) of a large amount of parcels of silicon among the present invention.
Fig. 5 is the ESEM picture of the Si@@TiO2 behind the sintering (look white) among the present invention.
Fig. 6 is the Uv-vis figure that nano titanium dioxide photocatalysis of the present invention decomposes dyestuff.
Fig. 7 is a preparation method's of the present invention process chart.
The specific embodiment
(a) pre-treatment of titanium dioxide nano-particle,
The titanium dioxide nano-particle of 100mg is added in the NaOH solution that concentration is 0.5mol/L, handle 7 hours with the rotating speed magnetic agitation of 500rpm after, 3 washing-centrifugations are 7 stand-by to PH.
(b) nanoparticle surface parcel carbon,
The nano particle 100mg that step (a) is made is added in the aqueous solution polyvinyl alcohol resin (PVA) of the carbonaceous organic material that is dissolvable in water water that concentration is 0.7mol/L.After fully mixing mixed liquor is imported in the hydrothermal reaction kettle, in 150 ℃ of following heat treated 2 hours.Reaction back with organic solvent methanol wash 3 times after, with dried for standby after the distillation washing 3 times.
(c) the skin parcel silica of carbon parcel nano particle,
(1) sample 100mg that step (b) is obtained and chloroform 5ml and ultra-pure water 200 μ l and acetone 3ml Jiao mixed 0.5 hour.
(2) dissolve tetramethoxysilance (TMOS) 0.1g in the ethanol solution of 5ml, Jiao mixed 0.5 hour.
(3) step (2) solution is added in step (1) solution, Jiao mixed 3 hours.
(4) after reaction finished, decompression distillation step (3) solution, ground through 100 ℃, 3 hours drying under reduced pressure to half-dried.
(d) high temperature is removed the interlayer carbon-coating,
The sample that step (c) is obtained places the Muffle furnace sintering, and 400 ℃ of control temperature, promptly obtain end product at 3 hours time after the grinding.
(a) pre-treatment of titanium dioxide nano-particle,
The titanium dioxide nano-particle of 500mg is added in the HCL solution that concentration is 1.2mol/L, handle 14 hours with the rotating speed magnetic agitation of 1000rpm after, 5 washing-centrifugations are 7 stand-by to PH.
(b) nanoparticle surface parcel carbon,
The nano particle 450mg that step (a) is made is added in the aqueous solution polyethylene glycol (PEG) of the carbonaceous organic material that is dissolvable in water water that concentration is 2.2mol/.After fully mixing mixed liquor is imported in the hydrothermal reaction kettle, in 200 ℃ of following heat treated 8 hours.Reaction back with organic solvent ethanol washing 7 times after, with dried for standby after the distillation washing 7 times.
(c) the skin parcel silica of carbon parcel nano particle,
(1) sample 450mg that step (b) is obtained and chloroform 15ml and ultra-pure water 700 μ l and acetone 7ml Jiao mixed 5 hours.
(2) dissolve tetraethoxysilance (TEOS) 2g in the ethanol solution of 20ml, Jiao mixed 5 hours.
(3) step (2) solution is added in step (1) solution, Jiao mixed 8 hours.
(4) after reaction finished, decompression distillation step (3) solution, ground through 120 ℃, 5 hours drying under reduced pressure to half-dried.
(d) high temperature is removed the interlayer carbon-coating,
The sample that step (c) is obtained places the Muffle furnace sintering, and 600 ℃ of control temperature, promptly obtain end product at 8 hours time after the grinding.
(a) pre-treatment of titanium dioxide nano-particle,
The titanium dioxide nano-particle of 300mg is added in the NaOH solution that concentration is 0.8mol/L, handle 10 hours with the rotating speed magnetic agitation of 750rpm after, 4 washing-centrifugations are 7 stand-by to PH.
(b) nanoparticle surface parcel carbon,
The nano particle 275mg that step (a) is made is added in the aqueous solution sucrose (Sucrose) of the carbonaceous organic material that is dissolvable in water water that concentration is 1.4mol/L.After fully mixing mixed liquor is imported in the hydrothermal reaction kettle, in 175 ℃ of following heat treated 5 hours.Reaction back with organic solvent-acetone washing 5 times after, with dried for standby after the distillation washing 5 times.
(c) the skin parcel silica of carbon parcel nano particle,
(1) sample 275mg that step (b) is obtained and chloroform 10ml and ultra-pure water 450 μ l and acetone 5ml Jiao mixed 2.5 hours.
(2) dissolve tetraethoxysilance (TEOS) 1g in the ethanol solution of 12ml, Jiao mixed 2.5 hours.
(3) step (2) solution is added in step (1) solution, Jiao mixed 5.5 hours.
(4) after reaction finished, decompression distillation step (3) solution, ground through 110 ℃, 4 hours drying under reduced pressure to half-dried.
(d) high temperature is removed the interlayer carbon-coating,
The sample that step (c) is obtained places the Muffle furnace sintering, and 500 ℃ of control temperature, promptly obtain end product at 5.5 hours time after the grinding.
Can see that from Fig. 1 compare with untreated TiO2, the nano titanium oxide that silicon directly wraps up (Si@TiO2) is at 1000-1200cm
-1The place has tangible absworption peak, shows that the structure that Si-O is arranged is present in.And at 950cm
-1Absworption peak then belongs to the structure of Ti-O-Si.And in the infrared spectrum of silicon parcel carbon parcel nano titanium oxide (Si@C@TiO2), though there is the structure of Si-O in electricity, at 794cm
-1A new absworption peak has appearred in the place.By document as can be known, this peak can belong to and have the Si-O-C structure in the system.Along with (Si@@TiO2), this Si-O-C structure (794cm as seen from the figure behind the carbon in the special chemical treatment removal interlayer
-1) also disappear, meet the imagination of experiment expection. thereupon
From Fig. 2, Fig. 3, Fig. 4, Fig. 5 as can be known, compare with Fig. 2 untreated sample, the TiO2 particle surface among apparent Fig. 3 has superscribed one deck carbon.And a large amount of parcels of silicon can be effectively gather together the nano particle of majority in Fig. 4.Fig. 5 is the electromicroscopic photograph behind the sample sintering of Fig. 4.Can see clearly that the nano-titania particle periphery has white circle, this white circle is the space that the parcel carbon-coating stays after being removed by high temperature among Fig. 3.
Shown in Figure 6 is, and nano titanium dioxide photocatalysis decomposes the Uv-vis figure of dyestuff, and being example with dyestuff weak acid yellow G has carried out the test of photocatalysis performance to the dispersion fixed nano-titania particle of this non-direct reunion.This figure is the Uv-vis figure that each sample light decomposes dyestuff weak acid yellow G solution after 30 minutes.Compare the ability that the sample of carbon parcel does not decompose dyestuff basically with stoste.Directly also because of the direct parcel of insulator silicon, capacity of decomposition descends a lot of the sample of Si parcel.And the photocatalysis Decomposition ability of the dispersion fixed nano-titania particle of this non-direct reunion and untreated titanium dioxide are in the same order of magnitude substantially; it had both had the silicon packing protective layer to have declared publicly this structure, can't harm the feature of its photocatalytic activity simultaneously again.This result has also obtained checking in the mensuration of gas phase GC carbon dioxide.
Claims (2)
1, a kind of preparation method of dispersion fixed nano-titania particle of non-direct reunion is characterized in that this method may further comprise the steps:
(a) TiO is used in the pre-treatment of titanium dioxide nano-particle
2Represent,
The titanium dioxide nano-particle of 100-500mg is added among the NaOH or HCl solution that concentration is 0.5-1.2mol/L, handle 7-14 hour with the rotating speed magnetic agitation of 500-1000rpm after, 3-5 washing-centrifugation is 7 stand-by to pH;
(b) process of nanoparticle surface parcel carbon is used C@TiO
2Represent,
The nano particle 100-450mg that step (a) is made is added into the aqueous solution of polyvinyl alcohol resin, polyethylene glycol or sucrose that concentration is 0.7-2.2mol/L, after fully mixing mixed liquor is imported in the hydrothermal reaction kettle, in 150-200 ℃ of following heat treated 2-8 hour, reaction back with organic solvent washing 3-7 time after, with dried for standby after distillation washing 3-7 time;
(c) with the process of sol-gel process, use Si@C@TiO at the skin parcel silica of carbon parcel nano particle
2Represent,
(1) sample 100-450mg that step (b) is obtained and chloroform 5-15ml and ultra-pure water 200-700 μ l and acetone 3-7ml stirred 0.5-5 hour,
(2) dissolving methyl silicate or ethyl orthosilicate 0.1-2g in the ethanol solution of 5-20ml stirred 0.5-5 hour,
(3) step (2) solution is added in step (1) solution, stirred 3-8 hour,
(4) after reaction finished, decompression distillation step (3) solution through 100-120 ℃, 3-5 hour drying under reduced pressure, ground after half-dried;
(d) process of removal interlayer carbon-coating is used Si@@TiO
2Represent,
The sample that step (c) is obtained places the Muffle furnace sintering, 400-600 ℃ of control temperature, and time 3-8 hour, grind behind the sintering, promptly obtain the dispersion fixed nano-titania particle of non-direct reunion.
2, the preparation method of the dispersion fixed nano-titania particle of non-direct reunion according to claim 1, it is characterized in that: the organic solvent described in the step (b) comprises methyl alcohol or ethanol or acetone.
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| KR101457648B1 (en) | 2010-12-27 | 2014-10-31 | 더 홍콩 유니버시티 오브 사이언스 앤드 테크놀러지 | Inorganic gel for controlled releasing of fragrance and disinfectant |
| CN102198392B (en) * | 2011-03-29 | 2013-01-30 | 四川农业大学 | Preparation method and application of carbon-wrapped titanium dioxide composite material |
| CN102205236B (en) * | 2011-03-29 | 2012-08-15 | 四川农业大学 | Method for preparing carbon-doped titanium dioxide composite material and application thereof |
| WO2013033865A1 (en) * | 2011-09-09 | 2013-03-14 | General Electric Company | Method of biogas production enhancement using cationic polymer |
| CN103011275B (en) * | 2012-12-03 | 2014-06-04 | 浙江理工大学 | Preparation method of three-ball-in-one micron-size titanium dioxide composite ball |
| CN104383942B (en) * | 2014-11-13 | 2016-06-22 | 三明学院 | A kind of CTiO of nucleocapsid structure2Solid acid catalyst and preparation method thereof |
| CN104801264A (en) * | 2015-03-30 | 2015-07-29 | 浙江理工大学 | Preparation method of porous SiO2 coated nano TiO2 particles |
| CN105696309A (en) * | 2016-04-29 | 2016-06-22 | 杭州同净环境科技有限公司 | Preparation method for loading nanoparticle composite fiber through thermal spray adhesion method |
| CN106607016B (en) * | 2016-12-29 | 2019-07-09 | 杭州同净环境科技有限公司 | Nano-titanium dioxide-silica composite photo-catalyst and preparation method thereof |
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