CN107020081B - Visible light catalytic coating with concrete as matrix and preparation method thereof - Google Patents
Visible light catalytic coating with concrete as matrix and preparation method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 39
- 239000011248 coating agent Substances 0.000 title claims abstract description 17
- 238000000576 coating method Methods 0.000 title claims abstract description 17
- 239000011159 matrix material Substances 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 12
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000006185 dispersion Substances 0.000 claims abstract description 19
- 239000002270 dispersing agent Substances 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 238000002791 soaking Methods 0.000 claims abstract description 4
- 238000004381 surface treatment Methods 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 239000000243 solution Substances 0.000 claims description 30
- 238000002156 mixing Methods 0.000 claims description 18
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 14
- 229910017604 nitric acid Inorganic materials 0.000 claims description 14
- 239000007864 aqueous solution Substances 0.000 claims description 12
- 239000003638 chemical reducing agent Substances 0.000 claims description 12
- RXPAJWPEYBDXOG-UHFFFAOYSA-N hydron;methyl 4-methoxypyridine-2-carboxylate;chloride Chemical compound Cl.COC(=O)C1=CC(OC)=CC=N1 RXPAJWPEYBDXOG-UHFFFAOYSA-N 0.000 claims description 11
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 claims description 8
- 239000011259 mixed solution Substances 0.000 claims description 7
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 239000007795 chemical reaction product Substances 0.000 claims description 4
- 238000007654 immersion Methods 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 239000004566 building material Substances 0.000 claims description 3
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 claims description 2
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 claims description 2
- IIACRCGMVDHOTQ-UHFFFAOYSA-M sulfamate Chemical compound NS([O-])(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-M 0.000 claims description 2
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 claims 1
- 239000002105 nanoparticle Substances 0.000 claims 1
- 230000001699 photocatalysis Effects 0.000 abstract description 18
- 239000011941 photocatalyst Substances 0.000 abstract description 10
- 239000003973 paint Substances 0.000 abstract description 2
- 239000012466 permeate Substances 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 abstract description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 24
- 239000007789 gas Substances 0.000 description 15
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 10
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 10
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 description 9
- 229940043267 rhodamine b Drugs 0.000 description 9
- 239000000203 mixture Substances 0.000 description 8
- 238000013032 photocatalytic reaction Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 6
- 238000007598 dipping method Methods 0.000 description 5
- 229910052797 bismuth Inorganic materials 0.000 description 4
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 4
- 239000004568 cement Substances 0.000 description 4
- 238000007146 photocatalysis Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 description 4
- 238000002386 leaching Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000002835 absorbance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- -1 automobile exhaust Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000000870 ultraviolet spectroscopy Methods 0.000 description 1
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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
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/31—Chromium, molybdenum or tungsten combined with bismuth
-
- 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
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
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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
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/40—Catalysts, in general, characterised by their form or physical properties characterised by dimensions, e.g. grain size
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
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Abstract
The invention discloses a visible light catalytic coating taking concrete as a matrix and a preparation method thereof, wherein the visible light catalytic coating comprises the following steps: curing the concrete matrix formed by pressing for 5-10 days, and then soaking the concrete matrix into the nano TiO2/Bi2WO6And (4) performing surface treatment in the dispersion liquid, taking out the dispersion liquid, and then continuing to maintain the dispersion liquid to obtain the paint. The invention of nano TiO2/Bi2WO6The dispersant can permeate into concrete pores, has larger contact area with polluted gas and liquid, and has high photocatalytic efficiency; with TiO2In contrast, with TiO2/Bi2WO6The photocatalyst can obviously improve the utilization rate of visible light.
Description
Technical Field
The invention relates to the field of photocatalysts, in particular to TiO suitable for building and pavement concrete2/Bi2WO6A visible light catalytic coating and a preparation method thereof.
Background
With the rapid development of economy, the air pollution problem is increasingly serious, and industrial waste gas, automobile exhaust, organic pollutants generated by building decoration and the like all bring threats to human health. The treatment of these pollution is a field of great importance to people. The method has the advantages of low energy consumption, simple and convenient operation, mild reaction conditions and no secondary pollution. The photocatalyst is applied to pavement materials and building materials to prepare the photocatalytic air purification coating, and becomes a technical means with wide application prospect.
In the present study, TiO2The preparation method has the advantages of high activity, safety, low price, no pollution and the like, and can be widely applied. However, TiO2The photocatalyst responds only to ultraviolet light in all regionsThe sunlight only accounts for about 5 percent, so that the utilization rate of the traditional photocatalytic coating to the sunlight is greatly reduced. There is a need for a new narrow bandgap semiconductor photocatalyst that solves the problem of low visible light utilization.
With conventional TiO2Bismuth tungstate (Bi) compared with photocatalytic material2WO6) Has narrower forbidden band width (2.75-2.9eV), can absorb visible light with the wavelength of more than 400nm, has good chemical stability, and is a research direction with greater prospect in the technology of photocatalytic degradation of pollutants.
Disclosure of Invention
In order to solve the problems of low utilization rate of visible light and low photocatalytic activity of a concrete photocatalytic coating in the prior art, the invention provides a TiO2/Bi2WO6 photocatalytic coating loaded on the surfaces of pavements and buildings and a preparation method thereof.
TiO with concrete as base2/Bi2WO6The preparation method of the visible light catalytic coating comprises the following steps:
curing the concrete matrix formed by pressing for 5-10 days, and then soaking the concrete matrix into the nano TiO2/Bi2WO6And (4) performing surface treatment in the dispersion liquid, taking out the dispersion liquid, and then continuing to maintain the dispersion liquid to obtain the paint.
Immersion in nano TiO2/Bi2WO6Curing the concrete matrix for 5-10 days before dispersion, preferably for 7 days, and continuing curing for 25-30 days after leaching. The curing before and after the immersion is conventional curing, namely: the temperature of a standard curing room is 20 +/-2 ℃, the relative humidity is more than 95%, the concrete test pieces are placed on a curing room support and are separated from each other by 10-20nm, and the surfaces of the test pieces are kept moist.
The concrete matrix is a conventional concrete matrix, and is prepared from the following raw materials: 42.5 grade portland cement; ISO standard sand; naphthalene-based superplasticizers; water;
the nano TiO of the invention2/Bi2WO6The dispersion liquid is prepared from nano titanium dioxide/bismuth tungstate powder, a dispersing agent and water. Preferably, the nano TiO2/Bi2WO6Nano TiO in dispersion2/Bi2WO6The mass concentration of (A) is 2-10%. More preferably 2 to 5%.
Further preferably, the nano TiO2/Bi2WO6The dispersion was prepared by the following method:
metered nano TiO2/Bi2WO6And mass of nano TiO2/Bi2WO6Adding 1-2% of dispersant by mass into water, uniformly stirring, and dispersing for 3-5 h to obtain TiO2/Bi2WO6Nano TiO 2-10 wt% concentration2/Bi2WO6And (3) dispersing the mixture.
The titanium dioxide/bismuth tungstate powder is mainly prepared from the following raw materials: bismuth nitrate; sodium tungstate; nitric acid; nano titanium dioxide, sodium hydroxide; and (3) water.
Preferably, the nano TiO2/Bi2WO6The preparation method comprises the following steps:
(1) dissolving bismuth nitrate in an aqueous solution of nitric acid, and uniformly mixing to obtain a solution A; dissolving sodium tungstate in water, and uniformly mixing to obtain a solution B;
(2) mixing the obtained solution A and solution B in proportion, stirring and uniformly mixing to obtain a mixed solution, adding nano titanium dioxide, and adjusting the pH of the mixed solution to 5 by using an aqueous solution of NaOH to obtain a suspension;
(3) and carrying out hydrothermal reaction on the suspension at 160-200 ℃ for 16-20 hours, washing and drying a hydrothermal reaction product to obtain the catalyst.
Dissolving concentrated nitric acid in water, and preferably, in the nitric acid aqueous solution, the concentration of the nitric acid is 15-25%; still more preferably 20%.
More preferably, when the solution A is prepared, the mass volume ratio of the bismuth nitrate to the nitric acid aqueous solution is (8-10) g; 9 mL; when preparing the solution B, the mass-to-volume ratio of sodium tungstate to water is (2-5) g; 80 mL; the mixing volume ratio of the solution A to the solution B is 1: (8-9); the mass ratio of the bismuth nitrate to the nano titanium dioxide is (30-40): 1.
more preferably, when the solution A is prepared, the mass volume ratio of the bismuth nitrate to the nitric acid is 9.7 g; 9 mL; when preparing the solution B, the mass-to-volume ratio of sodium tungstate to water is 3.29 g; 80 mL; the mixing volume ratio of the solution A to the solution B is 1: 9; the mass ratio of the bismuth nitrate to the nano titanium dioxide is 31: 1.
mixing the solution A and the solution B, and then continuously stirring for 1 hour to uniformly mix; the pH value of the mixed solution in the step (2) is further preferably adjusted to 5; the hydrothermal reaction is carried out in a hydrothermal kettle; the hydrothermal reaction is further preferably carried out at 160 ℃ for 18 hours.
Most preferably, nano TiO2/Bi2WO6The preparation method comprises the following steps:
(1) 9.702g of bismuth nitrate is dissolved in 9mL of aqueous solution with the nitric acid mass concentration of 20%, 3.298g of sodium tungstate is dissolved in 80mL of water, the two solutions are mixed after being respectively stirred uniformly, and the mixture is stirred for 1 hour at room temperature;
(2) adding nano titanium dioxide, and adjusting the pH value of the mixed solution to 5 by using an aqueous solution of NaOH;
(3) adding the suspension into a 100mL hydrothermal kettle, and reacting at 160 ℃ for 18 h;
(4) washing the reaction product with water and drying.
Preferably, the dispersant is one of a naphthalene water reducer, a carboxylic acid water reducer or a sulfamate water reducer. All are commercially available.
Preferably, the concrete matrix is in nano TiO2/Bi2WO6The immersion time in the dispersion is 1-5 min.
The invention also provides TiO which is prepared by the preparation method and takes concrete as a matrix2/Bi2WO6A visible light catalytic coating.
The invention also provides a method for preparing the TiO2/Bi2WO6A concrete matrix building material of a visible light catalytic coating.
Compared with the prior art, the invention has the following beneficial effects:
(1) the nano TiO2/Bi2WO6 dispersing agent can permeate into concrete pores, has larger contact area with polluted gas and liquid, and has high photocatalytic efficiency;
(2) with TiO2Compared with, adoptTiO2/Bi2WO6The photocatalyst can obviously improve the utilization rate of visible light.
Drawings
FIG. 1 is a schematic diagram of an apparatus for photocatalytic degradation of formaldehyde.
Wherein 1 is an input gas device, 2 is a gas flow controller, 3 is a photocatalytic reaction container, 4 is a sample, 5 is a fluorescent lamp light source, and 6 is an output gas.
Detailed Description
The invention is further illustrated by the following specific examples, which are not intended to be limiting in any way.
The starting materials used in the following examples are all commercially available.
Fig. 1 shows a device for performing a photocatalytic degradation experiment on a sample, which comprises a photocatalytic reaction container 3, wherein one end of the photocatalytic reaction container 3 is connected with an input gas device 1, the input gas device 1 is provided with a gas flow controller 2, output gas 6 is output from the other end of the photocatalytic reaction container, and the photocatalytic reaction container 3 is provided with a fluorescent lamp light source 5. During detection, the sample 4 is placed in a photocatalytic reaction container, gas flows through the sample, and meanwhile, a daylight lamp light source is turned on for irradiation.
EXAMPLE 1 preparation of Nano bismuth tungstate powder
Dissolving 2mL of concentrated nitric acid in 7mL of water to obtain an aqueous solution with the concentration of the nitric acid being about 20%, and taking 9.702g of bismuth nitrate in the aqueous solution; 3.298g of sodium tungstate is dissolved in 80mL of water, the two solutions are mixed after being respectively stirred uniformly, and the mixture is stirred for 1 hour at room temperature; adding 0.32g of nano titanium dioxide, and adjusting the pH value of the mixed solution to 5 by using an aqueous solution of NaOH;
adding the suspension into a 100mL hydrothermal kettle, and reacting at 160 ℃ for 18 h; washing the reaction product with water and drying to obtain the nano TiO2/Bi2WO6And then standby.
Example 2
Adopting 42.5-grade common cement, natural sand with the gradation of 0.15-4.75mm and meeting the national standard requirement, a naphthalene-based high-efficiency water reducing agent and water, and mixing the raw materials according to the proportion of aggregate: cement: water: mixing and stirring a water reducing agent which is 3:1:0.3:0.025 to obtain a common concrete mixture, and mechanically pressing and forming a concrete product with the size of 60 multiplied by 100 multiplied by 200 mm.
Nano TiO prepared in example 12/Bi2WO6As a photocatalyst, a naphthalene-based high-efficiency water reducing agent is used as a dispersing agent, and the mixing amount of the dispersing agent is nano TiO2/Bi2WO62.5% by mass of TiO2/Bi2WO6Adding the dispersing agent and the dispersing agent into water, and uniformly stirring to obtain the nano TiO with the mass concentration of 5 percent2/Bi2WO6And (3) dispersing the mixture.
After the concrete product is cured for 1 day, nano TiO with the mass concentration of 5 percent is adopted2/Bi2WO6Dipping the concrete by the dispersion liquid, wherein the dipping height is 10mm, the dipping time is 3min, curing the concrete for 28 days after dipping, cutting the concrete into samples of 30 multiplied by 50 multiplied by 100mm, naturally drying for 24h, and carrying out a photocatalytic degradation experiment by using a 35W fluorescent lamp as a light source and a rhodamine B solution as a photocatalytic degradation object and using the device shown in figure 1.
The test experiment for degrading rhodamine B by photocatalysis comprises the following steps:
(1) preparing 10mg/L rhodamine B solution, respectively diluting to obtain 8mg/L, 6mg/L, 2mg/L and 0 rhodamine B solution, and measuring the linear relation between the rhodamine B concentration and the absorbance at the wavelength of 554nm by using an ultraviolet spectrophotometer to obtain a standard curve.
(2) And (3) putting the concrete product soaked by the photocatalyst dispersion liquid into a container, adding 10mg/L rhodamine B solution, and turning on a fluorescent lamp to perform a photocatalytic experiment.
(3) And measuring the absorbance of the solution by using an ultraviolet-visible spectrophotometer after the photocatalysis is carried out for a certain time, and calculating the concentration of the rhodamine B solution according to a standard curve.
(4) The photocatalytic efficiency of the photocatalyst is characterized according to the concentration change of rhodamine B as follows: (initial concentration-concentration after a certain time of photocatalysis)/initial concentration. The results are shown in Table 1
TABLE 1 photocatalytic degradation efficiency of rhodamine B by concrete products impregnated with TiO2/Bi2WO6 visible light catalytic coating
Example 4
Adopting 42.5-grade common cement, natural sand with the gradation of 0.15-4.75mm and meeting the national standard requirement, a naphthalene-based high-efficiency water reducing agent and water, and mixing the raw materials according to the proportion of aggregate: cement: water: mixing and stirring a water reducing agent which is 3:1:0.3:0.025 to obtain a common concrete mixture, and mechanically pressing and forming a concrete product with the size of 60 multiplied by 100 multiplied by 200 mm.
Nano TiO prepared in example 12/Bi2WO6As a photocatalyst, a naphthalene-based high-efficiency water reducing agent is used as a dispersing agent, and the mixing amount of the dispersing agent is nano TiO2/Bi2WO62.5% by mass of TiO2/Bi2WO6Adding the dispersing agent and the dispersing agent into water, and uniformly stirring to obtain the nano TiO with the mass concentration of 5 percent2/Bi2WO6And (3) dispersing the mixture.
After the concrete product is cured for 1 day, nano TiO with the mass concentration of 5 percent is adopted2/Bi2WO6Dipping the concrete by the dispersion liquid, wherein the leaching height is 10mm, the soaking time is 3min, curing the concrete for 28 days after leaching, and performing a photocatalytic degradation experiment by adopting the photocatalytic device shown in figure 1, a 35W fluorescent lamp as a light source and formaldehyde gas as a photocatalytic degradation object.
The test experiment for photocatalytic degradation of formaldehyde gas comprises the following steps:
(1) dry air and formaldehyde standard gas are mixed according to a proportion to prepare mixed gas, and the formaldehyde concentration (about 100ppm) of the mixed gas is measured by sampling.
(2) The sample was placed in a sealed photocatalytic reactor.
(3) Inputting a certain amount of reaction gas into the reactor, and turning on a light source of the fluorescent lamp;
(4) after a certain time of photocatalytic reaction, the concentration of formaldehyde is recorded according to the data of the formaldehyde detector.
(5) According to the concentration of formaldehyde, the photocatalytic efficiency (initial concentration-concentration after certain time of photocatalysis)/initial concentration can be calculated.
The results are shown in Table 2.
TABLE 2 TiO2/Bi2WO6Efficiency of photocatalytic degradation of formaldehyde by concrete product impregnated with visible light catalytic coating
The results in tables 1 and 2 show that the coating prepared by the method has high photocatalytic efficiency, and the utilization rate of visible light can be obviously improved.
Claims (5)
1. TiO with concrete as base2/Bi2WO6The preparation method of the visible light catalytic coating is characterized by comprising the following steps:
curing the concrete matrix formed by pressing for 5-10 days, and then soaking the concrete matrix into the nano TiO2/Bi2WO6Performing surface treatment in the dispersion liquid, taking out and then continuing to maintain to obtain the nano-silver nano-particles; the nano TiO2/Bi2WO6Nano TiO in dispersion2/Bi2WO6The mass concentration of (A) is 2-10%; concrete matrix in nano TiO2/Bi2WO6The immersion time in the dispersion liquid is 1-5 min;
the nano TiO2/Bi2WO6The dispersion was prepared by the following method:
metered nano TiO2/Bi2WO6And mass of nano TiO2/Bi2WO6Adding 1-2% of dispersant by mass into water, uniformly stirring, and dispersing for 3-5 h to obtain TiO2/Bi2WO6Nano TiO 2-10 wt% concentration2/Bi2WO6A dispersion liquid; the dispersing agent is one of a naphthalene water reducing agent, a carboxylic acid water reducing agent or a sulfamate water reducing agent.
2. The method of claim 1, wherein the method comprisesThe nano TiO2/Bi2WO6The preparation method comprises the following steps:
(1) dissolving bismuth nitrate in an aqueous solution of nitric acid, and uniformly mixing to obtain a solution A; dissolving sodium tungstate in water, and uniformly mixing to obtain a solution B;
(2) mixing the obtained solution A and the solution B in proportion, stirring and uniformly mixing to obtain a mixed solution, adding nano titanium dioxide powder, and adjusting the pH of the mixed solution to 4.5-5.5 by using an aqueous solution of NaOH to obtain a suspension;
(3) and carrying out hydrothermal reaction on the suspension at 160-200 ℃ for 16-20 hours, washing and drying a hydrothermal reaction product to obtain the catalyst.
3. The method according to claim 2, wherein the concentration of the nitric acid in the aqueous solution of nitric acid is 15 to 25%.
4. The preparation method according to claim 2, wherein when the solution A is prepared, the mass-to-volume ratio of the bismuth nitrate to the nitric acid is (8-10) g; 9 mL; when preparing the solution B, the mass-to-volume ratio of sodium tungstate to water is (2-5) g; 80 mL; the mixing volume ratio of the solution A to the solution B is 1: (8-9); the mass ratio of the bismuth nitrate to the nano titanium dioxide is (30-40): 1.
5. a concrete-based TiO prepared by the preparation method of any one of claims 1 to 42/Bi2WO6A concrete matrix building material of a visible light catalytic coating.
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| CN1583255A (en) * | 2004-06-15 | 2005-02-23 | 南京大学 | Bismuth contained composite oxide BiMO4 and Bi2NO6 semiconductor photocatalyst, preparation and use |
| CN101757908A (en) * | 2009-12-29 | 2010-06-30 | 南开大学 | Method for preparing Bi2WO6 with high efficiency and visible light photocatalytic activity by adjusting pH |
| CN102335602A (en) * | 2010-07-21 | 2012-02-01 | 中国科学院上海硅酸盐研究所 | Bismuth tungstate composite photocatalyst, preparation method thereof, and application thereof |
| CN103272584A (en) * | 2013-06-18 | 2013-09-04 | 山东大学 | Full spectrum photocatalyst and preparation method thereof |
| CN105597738A (en) * | 2016-01-15 | 2016-05-25 | 武汉工程大学 | Visible-light-induced photocatalyst bismuth tungstate nano-chip and preparation method thereof |
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| CN1583255A (en) * | 2004-06-15 | 2005-02-23 | 南京大学 | Bismuth contained composite oxide BiMO4 and Bi2NO6 semiconductor photocatalyst, preparation and use |
| CN101757908A (en) * | 2009-12-29 | 2010-06-30 | 南开大学 | Method for preparing Bi2WO6 with high efficiency and visible light photocatalytic activity by adjusting pH |
| CN102335602A (en) * | 2010-07-21 | 2012-02-01 | 中国科学院上海硅酸盐研究所 | Bismuth tungstate composite photocatalyst, preparation method thereof, and application thereof |
| CN103272584A (en) * | 2013-06-18 | 2013-09-04 | 山东大学 | Full spectrum photocatalyst and preparation method thereof |
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