CN109364903A - A kind of high-specific area nano optically catalytic TiO 2 coating and preparation method - Google Patents
A kind of high-specific area nano optically catalytic TiO 2 coating and preparation method Download PDFInfo
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- 239000011248 coating agent Substances 0.000 title claims abstract description 52
- 238000000576 coating method Methods 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 12
- 229910010413 TiO 2 Inorganic materials 0.000 title claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 27
- 238000007146 photocatalysis Methods 0.000 claims abstract description 12
- 230000001699 photocatalysis Effects 0.000 claims abstract description 12
- 239000012159 carrier gas Substances 0.000 claims abstract description 11
- 239000002086 nanomaterial Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 5
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims abstract 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 28
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 14
- 239000011159 matrix material Substances 0.000 claims description 13
- 150000004767 nitrides Chemical class 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 7
- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- 239000006185 dispersion Substances 0.000 claims description 6
- 239000001307 helium Substances 0.000 claims description 5
- 229910052734 helium Inorganic materials 0.000 claims description 5
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 5
- 238000000875 high-speed ball milling Methods 0.000 claims description 5
- 238000000703 high-speed centrifugation Methods 0.000 claims description 5
- 239000003595 mist Substances 0.000 claims description 5
- 239000004408 titanium dioxide Substances 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 4
- 239000003381 stabilizer Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000008187 granular material Substances 0.000 abstract 1
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- 229960000907 methylthioninium chloride Drugs 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 6
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- 239000001263 FEMA 3042 Substances 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- LRBQNJMCXXYXIU-PPKXGCFTSA-N Penta-digallate-beta-D-glucose Natural products OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-PPKXGCFTSA-N 0.000 description 2
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- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- LRBQNJMCXXYXIU-NRMVVENXSA-N tannic acid Chemical compound OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-NRMVVENXSA-N 0.000 description 2
- 229940033123 tannic acid Drugs 0.000 description 2
- 235000015523 tannic acid Nutrition 0.000 description 2
- 229920002258 tannic acid Polymers 0.000 description 2
- 244000215068 Acacia senegal Species 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 229920000084 Gum arabic Polymers 0.000 description 1
- 244000283207 Indigofera tinctoria Species 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- HGWOWDFNMKCVLG-UHFFFAOYSA-N [O--].[O--].[Ti+4].[Ti+4] Chemical compound [O--].[O--].[Ti+4].[Ti+4] HGWOWDFNMKCVLG-UHFFFAOYSA-N 0.000 description 1
- 235000010489 acacia gum Nutrition 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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- 229960000935 dehydrated alcohol Drugs 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052588 hydroxylapatite Inorganic materials 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 1
- 239000002114 nanocomposite Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
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- 238000004064 recycling Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000007751 thermal spraying Methods 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/34—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation
- B01J37/349—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of flames, plasmas or lasers
-
- 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
-
- 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
- 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
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Plasma & Fusion (AREA)
- Toxicology (AREA)
- Catalysts (AREA)
Abstract
The present invention relates to a kind of high-specific area nano optically catalytic TiO 2 coating and preparation methods, belong to field of material preparation.Nano-titanium dioxide powder is agglomerated into loose spheric granules, high power plasma gun (the 180kW-3000A of (pressure < 10mbar) under low-pressure controlled environment is sent by carrier gas, throughput reaches 200slpm), it is set to be gasified totally in the high temperature of expansion, high-speed jet, then jet stream end forms the nano titanium dioxide photocatalysis coating with high-specific surface area.Manufactured coating of the present invention has that plumage-column micro-nano structure, specific surface area are high, absorption property is excellent, photocatalysis performance is strong, and preparation method it is easy to operate, it is at low cost, be suitble to industrialized production.
Description
Technical field
The present invention relates to a kind of high-specific area nano optically catalytic TiO 2 coating and preparation methods.
Background technique
Environmental problem such as air environmental pollution, water resource pollution, which have become, influences the key that human survival and development is faced
Problem need to develop advanced environmental improvement technology.Photocatalysis technology is to accelerate chemistry by photochemical catalyst under the radiation of light
The technology of reaction has in fields such as environment, the energy using lasting Driven by Solar Energy light-catalyzed reaction and potentially applies valence
Value.Meanwhile its high catalytic efficiency, non-toxic by-products generate, it is considered to be solve the possible technique of environmental problem.
TiO2The advantages that because of its stable chemical property, high-durability, low price, nontoxic and Strong oxdiative ability, become most
There is the catalysis material of application prospect.Wherein, Nanoparticulate TiO2Catalyst, grain diameter is small, large specific surface area, and catalysis is lived
Property is higher.However, in actual application, especially in the liquid phase, pellet type catalyst needs subsequent centrifugation or filtering dress
It sets and is recycled, this undoubtedly increases economic input and technology complexity.Furthermore, it is also possible to cause secondary environmental pollution.
It, can be by TiO using technical methods such as sol-gel method, chemical vapour deposition technique, hot spray process, electrochemical methods2Nanometer
Grain is fixed on carrier and is prepared into TiO2Coating, to solve the problems, such as recycling.But compare nano particle TiO2, coating TiO2's
Specific surface area is extremely low, its catalytic activity, absorption property is caused to decline to a great extent.
Application No. is the patent of invention of 201610337956.X " a kind of micro nano structure composite coating and preparation method thereof "
It is sprayed using liquid material thermal spraying mode, is made and has both the high TiO of corrosion resistance, bond strength2Coating.It is poly- by being added in feeding
Urethane or dehydrated alcohol, coating surface hydrophobe is controllable, is conducive to the performance of photo-catalysis function.Further, application No. is
201610336095.3 patent of invention " a kind of micro-nano structure photocatalysis coating and preparation method thereof " with Coated With Hydroxyapatite
Nano-TiO2The suspension for forming composite material, deposits to substrate surface through hot-spraying technique for it, obtains photocatalysis coating.It should
Invention claims the HA-TiO obtained by it2Nano composite photocatalytic coating has that porous micro nano structure, absorption property be excellent, light is urged
Change the strong feature of performance, but the specific surface area of its report is still lower, only 104m2/g。
Summary of the invention
An object of the present invention be it is in view of the deficiencies in the prior art or insufficient, a kind of high-specific surface area is provided and is received
Rice optically catalytic TiO 2 coating.
It is a further object of the present invention to provide a kind of preparation methods of high-specific area nano optically catalytic TiO 2 coating.
A kind of high-specific area nano optically catalytic TiO 2 coating, it is characterised in that the coating material is by nanometer titanium dioxide
Titanium composition, with a thickness of 100~200 μm, coating has plumage-column micro-nano structure, and porosity is not less than 25%, and specific surface area is not low
In 150m2/g。
A kind of a kind of preparation method of high-specific area nano optically catalytic TiO 2 coating as described in claim 1,
It is characterized in that this method step includes:
(1) by TiO2Powder is placed in deionized water, sequentially adds binder, dispersion stabilizer, and high speed ball milling dispersion 6~
10 hours, it is configured to stable suspended nitride；
(2) suspended nitride for obtaining previous step obtains reunion powder by high speed centrifugation mist projection granulating；
(3) matrix is cleaned and is decontaminated, be installed to the sample holder of vacuum cavity, be evacuated to 0.5mbar, then backfill argon gas
To 40mbar, then start high power plasma gun, then vacuum is gradually evacuated to 1.5mbar, makes Ar-He plasma jet
Expansion；
(4) N is used2The reunion powder of step (2) is sent into high power plasma gun by carrier gas, makes it in high temperature, high speed
It is gasified totally in jet stream, then being formed in matrix has plumage-column micro-nano structure nanometer titanium dioxide coating.
The TiO2The average grain diameter of powder is 50nm, and maximum particle diameter is no more than 100nm.
The component and mass ratio of the suspended nitride are as follows: TiO2Powder 5~20%, binder 0.1-10%, dispersion are steady
Determine agent 0.1-5%, surplus is deionized water.
The reunion powder is loosely organized, and partial size is 15~40 μm.
The parameter of the prepares coating are as follows: the power of high power plasma gun is 100~180kW, argon flow 60
~100slpm, helium gas flow are 30~100slpm, powder feeding carrier gas N2For 16L/min, matrix at a distance from spray gun for 950~
2000mm。
For the micro-structure and property of coating prepared by the analysis present invention, beneficial effects of the present invention are illustrated, will be penetrated using X
Line diffractometer (XRD) characterizes coating substance phase, coating section is characterized using scanning electron microscope (SEM), using nitrogen adsorption methods
Coating specific surface area is detected, the photocatalysis performance of coating is characterized by coating degradation methylene blue solution.
Beneficial effects of the present invention:
1) manufactured coating of the present invention has plumage-column micro-nano structure, and absorption property is excellent, is conducive to TiO2Photocatalysis function
The performance of energy；
2) manufactured coating porosity of the present invention is not less than 25%, and specific surface area is not less than 150m2/ g, far more than existing skill
Art scheme；
3) preparation method that the present invention reports industrialized production easy to operate, at low cost, suitable.
Detailed description of the invention
The material phase analysis result of 1 coating of Fig. 1 embodiment: α-Anatase, β-Rutile Type；
The section SEM of 2 coating of Fig. 2 embodiment schemes: 1) matrix, and 2) coating；
The case where 2 coating degradation methylene blue of Fig. 3 embodiment.
Specific embodiment
Preparation method of the invention is described further combined with specific embodiments below.
Embodiment 1
(1) by the nano-TiO of 100g2Powder is placed in 1000g deionized water, sequentially adds 5g polyethylene glycol, 1g
Tannic acid, high speed ball milling disperse 10 hours, are configured to stable suspended nitride；(2) suspended nitride that previous step obtains is passed through
High speed centrifugation mist projection granulating obtains the reunion powder that partial size is 15~40 μm；
(3) mild steel is cleaned and is decontaminated, be installed to the substrate holder of vacuum cavity, be evacuated to 0.5mbar, then backfill argon
Then gas starts high power plasma gun to 40mbar, then vacuum is gradually evacuated to 1.5mbar, penetrates Ar-He plasma
Stream expansion；
(4) N is used2The reunion powder of step (2) is sent into high power plasma gun by carrier gas, makes it in high temperature, high speed
It is gasified totally in jet stream, then forms nanometer titanium dioxide coating in matrix.Spray parameters used are as follows: high power plasma gun
Power be 125kW, argon flow 100slpm, helium gas flow 40slpm, powder feeding carrier gas N2For 16L/min, matrix and spray
Distance remains 950mm between rifle.
Coating substance phase is characterized using X-ray diffractometer (XRD), Fig. 1 is corresponding test structure.It can by XRD diagram spectrum analysis
Know, be mainly Anatase and Rutile Type in coating, the mixed crystal of two kinds of object phases is conducive to the promotion of photocatalysis performance.
Embodiment 2
(1) by the nano-TiO of 100g2Powder is placed in 1000g deionized water, sequentially adds 5g polyethylene glycol, 2g
Gum arabic, high speed ball milling disperse 8 hours, are configured to stable suspended nitride；
(2) suspended nitride for obtaining previous step obtains the group that partial size is 15~40 μm by high speed centrifugation mist projection granulating
Poly powder；
(3) 316L stainless steel base is cleaned and is decontaminated, be installed to the bracket of vacuum cavity, be evacuated to 0.5mbar, then return
It fills out argon gas and then starts high power plasma gun to 40mbar, then vacuum is gradually evacuated to 1.5mbar, make Ar-He plasma
Body shooting flow expanding；
(4) N is used2The reunion powder of step (2) is sent into high power plasma gun by carrier gas, makes it in high temperature, high speed
It is gasified totally in jet stream, then forms nanometer titanium dioxide coating in matrix.Spray parameters used are as follows: high power plasma gun
Power be 130kW, argon flow 90slpm, helium gas flow 35slpm, powder feeding carrier gas N2For 16L/min, matrix and spray
Distance remains 950mm between rifle.
Using the microstructure of scanning electron microscope (SEM) characterization coating section, Fig. 2 is SEM photograph.It can be divided by it
Analysis, coating has plumage-column micro-nano structure, and there are a large amount of holes between plumage-column microstructure unit, are different from existing preparation skill
Art photocatalysis coating obtained.
Embodiment 3
(1) by the nano-TiO of 100g2Powder is placed in 1000g deionized water, sequentially add 5g polyvinylpyrrolidone,
1g tannic acid, high speed ball milling disperse 10 hours, are configured to stable suspended nitride；
(2) suspended nitride for obtaining previous step obtains the group that partial size is 15~40 μm by high speed centrifugation mist projection granulating
Poly powder；
(3) mild steel is cleaned and is decontaminated, be installed to the substrate holder of vacuum cavity, be evacuated to 0.5mbar, then backfill argon
Then gas starts high power plasma gun to 40mbar, then vacuum is gradually evacuated to 1.5mbar, penetrates Ar-He plasma
Stream expansion；
(4) N is used2The reunion powder of step (2) is sent into high power plasma gun by carrier gas, makes it in high temperature, high speed
It is gasified totally in jet stream, then forms nanometer titanium dioxide coating in matrix.Spray parameters used are as follows: high power plasma gun
Power be 125kW, argon flow 100slpm, helium gas flow 40slpm, powder feeding carrier gas N2For 16L/min, matrix and spray
Distance remains 950mm between rifle.It is tested through nitrogen adsorption methods, the porosity of coating is 26%, specific surface 167m2/ g is remote high
The coating prepared by current technology.
Embodiment 4
The photocatalysis performance of coating is characterized by coating degradation methylene blue solution:
1) compound concentration is the methylene blue solution of 5ppm, and 50ml is taken to be placed in culture dish.
2) coating prepared by Example 2, is cut to and is put into methylene blue solution having a size of 4X4cm sample.
3) methylene blue solution for placing sample is placed in darkroom, opens ultraviolet lamp and degrades.The power of ultraviolet lamp is
15W, wavelength 365nm, sample and ultraviolet lamp tube distance remain 15cm.5ml methylene is taken at interval of 0.5h after ultraviolet lamp unlatching
Base indigo plant solution carries out absorbance test, and the concentration of Methylene Blue in Solution is calculated according to its absorbance value at wavelength 664nm.
Fig. 3 is corresponding test result, concentration.By degradation curve in figure as it can be seen that the coating prepared in fact is compared with pure blank group, have good
Good degradation property degrades 75% or so methylene blue solution after 3.5h.
It should be pointed out that above embodiment can make those skilled in the art that the present invention be more completely understood, but not with
Any mode limits the present invention.Therefore, although this specification is to present invention has been detailed description, art technology
Personnel should be appreciated that and still can modify or equivalently replace the present invention；And all do not depart from the skill of essence of the invention
Art scheme and its improvement should all be covered in the scope of protection of the patent of the present invention.
Claims (7)
1. a kind of high-specific area nano optically catalytic TiO 2 coating, it is characterised in that the coating material is by nano-titanium dioxide
Composition, with a thickness of 100~200 μm, coating has plumage-column micro-nano structure, and porosity is not less than 25%, and specific surface area is not less than
150m2/g。
2. a kind of a kind of preparation method of high-specific area nano optically catalytic TiO 2 coating as described in claim 1,
It is characterized in that this method step includes:
(1) by TiO2Powder is placed in deionized water, sequentially adds binder, dispersion stabilizer, and the dispersion 6~10 of high speed ball milling is small
When, it is configured to stable suspended nitride；
(2) suspended nitride for obtaining previous step obtains reunion powder by high speed centrifugation mist projection granulating；
(3) matrix is cleaned and is decontaminated, be installed to the sample holder of vacuum cavity, be evacuated to 0.5mbar, then backfill argon gas extremely
Then 40mbar starts high power plasma gun, then vacuum is gradually evacuated to 1.5mbar, keep Ar-He plasma jet swollen
It is swollen；
(4) N is used2The reunion powder of step (2) is sent into high power plasma gun by carrier gas, makes it in high temperature, high-speed jet
It is gasified totally, then being formed in matrix has plumage-column micro-nano structure nanometer titanium dioxide coating.
3. method according to claim 2, it is characterised in that the TiO2The average grain diameter of powder is 50nm, maximum particle diameter
No more than 100nm.
4. method according to claim 2, it is characterised in that the component and mass ratio of the suspended nitride are as follows: TiO2Powder 5
~20%, binder 0.1-10%, dispersion stabilizer 0.1-5%, surplus are deionized water.
5. method according to claim 2, it is characterised in that the reunion powder is loosely organized, and partial size is 15~40 μm.
6. method according to claim 2, it is characterized in that the parameter of the prepares coating are as follows: the function of high power plasma gun
Rate is 100~180kW, and argon flow is 60~100slpm, and helium gas flow is 30~100slpm, powder feeding carrier gas N2For 16L/
Min, matrix are 950~2000mm at a distance from spray gun.
7. application of the coating described in claim 1 in photocatalysis.
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