CN111250136A - Composite photocatalyst, photocatalytic splice plate and preparation method - Google Patents
Composite photocatalyst, photocatalytic splice plate and preparation method Download PDFInfo
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- CN111250136A CN111250136A CN202010102144.3A CN202010102144A CN111250136A CN 111250136 A CN111250136 A CN 111250136A CN 202010102144 A CN202010102144 A CN 202010102144A CN 111250136 A CN111250136 A CN 111250136A
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- 239000011941 photocatalyst Substances 0.000 title claims abstract description 60
- 239000002131 composite material Substances 0.000 title claims abstract description 55
- 230000001699 photocatalysis Effects 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- 239000002243 precursor Substances 0.000 claims abstract description 16
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229920000877 Melamine resin Polymers 0.000 claims abstract description 10
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims abstract description 10
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000004202 carbamide Substances 0.000 claims abstract description 4
- 238000013329 compounding Methods 0.000 claims abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical group O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000006185 dispersion Substances 0.000 claims description 18
- 239000000758 substrate Substances 0.000 claims description 17
- 239000003822 epoxy resin Substances 0.000 claims description 16
- 229920000647 polyepoxide Polymers 0.000 claims description 16
- 238000001354 calcination Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 239000004793 Polystyrene Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000005187 foaming Methods 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 229920002223 polystyrene Polymers 0.000 claims description 3
- 230000015556 catabolic process Effects 0.000 abstract description 30
- 238000006731 degradation reaction Methods 0.000 abstract description 30
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 230000008859 change Effects 0.000 description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000007146 photocatalysis Methods 0.000 description 3
- 238000005215 recombination Methods 0.000 description 3
- 230000006798 recombination Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001507 metal halide Inorganic materials 0.000 description 1
- 150000005309 metal halides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010831 paired-sample T-test Methods 0.000 description 1
- 238000013032 photocatalytic reaction Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 238000009423 ventilation 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
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/24—Nitrogen compounds
-
- 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
- B01D53/007—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 by irradiation
-
- 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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
- C08J2325/02—Homopolymers or copolymers of hydrocarbons
- C08J2325/04—Homopolymers or copolymers of styrene
- C08J2325/06—Polystyrene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2463/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
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- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
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Abstract
The invention discloses a composite photocatalyst and a preparation method thereof. The composite photocatalyst consists of g-C3N4Compounding the reaction precursor with nano titanium dioxide; wherein, said g-C3N4The reaction precursor is selected from one or more of melamine and urea. The photocatalyst can improve the degradation rate of NO. The invention also discloses a photocatalytic splice plate and a preparation method thereof. The photocatalytic splicing plate has the advantages of more abundant applicable occasions, convenient carrying and transportation and capability of being correspondingly adjusted according to application requirements.
Description
Technical Field
The invention relates to a composite photocatalystA photocatalytic splice plate and a preparation method thereof, in particular to a g-C3N4/TiO2A composite photocatalyst, a photocatalytic splice plate and a preparation method.
Background
The acceleration of the urbanization process and the improvement of the living standard of people lead the automobile keeping quantity to increase year by year, and the automobile exhaust emission causes a large amount of pollution to cause extremely bad influence on the living environment of people. Especially in closed or semi-closed places such as tunnels and underground parking lots with poor ventilation conditions and frequent vehicle passing, a large amount of automobile exhaust discharged is gathered, and the health of people is seriously harmed. In order to reduce the harm caused by tail gas pollution, various prevention and control methods are proposed at home and abroad, such as developing clean new energy, improving the fuel quality, adopting a ternary tail gas catalytic converter and the like, but the methods have limited degradation capability on pollutants and poor application effect. In recent years, the application of semiconductor photocatalysis technology in the aspect of environmental governance is concerned, and the semiconductor photocatalysis technology becomes a new environment-friendly technology with development potential.
At present, the main application form of the photocatalytic technology in the aspect of degrading atmospheric pollutants is a photocatalytic pavement, namely, a method of direct doping, coating or surface spraying is adopted to apply a photocatalyst to a cement concrete pavement or an asphalt pavement, but the two photocatalytic pavements have poor wear resistance, so that the photocatalytic effect is not durable. In addition, the common photocatalyst is nano TiO2The photocatalyst can only absorb ultraviolet light to perform photocatalytic reaction, and the application occasion is limited.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a composite photocatalyst, which has a high NO degradation rate. The invention also aims to provide a preparation method of the composite photocatalyst. It is yet another object of the present invention to provide a photocatalytic splice plate having a high NO degradation rate. Furthermore, the photocatalytic splicing plate is more applicable to various occasions, is convenient to carry and transport, and can be adjusted correspondingly according to application requirements. The invention also aims to provide a preparation method of the photocatalytic splicing plate.
In one aspect, the invention provides a composite photocatalyst consisting of g-C3N4The reaction precursor is compounded with the nano titanium dioxide to obtain the titanium dioxide. g-C3N4The reaction precursor is selected from one or more of melamine and urea. Preferably, g-C3N4The reaction precursor is melamine. This is advantageous for increasing g-C3N4The yield of (a).
The composite photocatalyst according to the present invention is preferably g-C3N4The mass ratio of the reaction precursor to the nano titanium dioxide is 0.1-10: 1. More preferably, g-C3N4The mass ratio of the reaction precursor to the nano titanium dioxide is 3-4: 1. Therefore, the degradation rate of the composite photocatalyst to NO is improved.
On the other hand, the invention provides a preparation method of the composite photocatalyst, which comprises the following steps:
(1) g to C3N4Reacting the precursor, the nano titanium dioxide and the solvent to form a dispersion;
(2) drying the dispersion formed in the step (1), and then grinding into powder;
(3) calcining the powder obtained in the step (2); and cooling the calcined product, and then grinding for the second time to obtain the composite photocatalyst.
In the preparation method of the present invention, g-C3N4The reaction precursor can be selected from one or more of melamine and urea; melamine is preferred. This is advantageous for increasing g-C3N4The yield of (a).
In the preparation method of the present invention, g-C3N4The mass ratio of the reaction precursor to the nano titanium dioxide can be 0.1-10: 1; preferably 3-4: 1. Therefore, the degradation rate of the composite photocatalyst to NO is improved.
According to the preparation method of the present invention, preferably, the solvent is deionized water. More preferably, g-C is sonicated3N4The reaction precursor, the nano titanium dioxide and the deionized water are uniformly mixed to form a dispersion. Thus, the device is provided withCan form uniform and stable dispersion, thereby being beneficial to improving the degradation rate of the composite photocatalyst to NO.
According to the preparation method of the invention, the drying temperature is preferably 40-100 ℃. More preferably, the drying temperature is 50-80 ℃.
In the invention, the calcining temperature is 450-800 ℃; more preferably 500 to 550 ℃. The calcining time is 2-6 h; more preferably 2.5 to 3.5 hours. Therefore, the degradation rate of the composite photocatalyst to NO is improved.
According to the preparation method provided by the invention, preferably, the calcining temperature is 450-800 ℃, and the calcining time is 2-6 h. More preferably, the calcining temperature is 500-600 ℃, and the calcining time is 2.5-3.5 h.
In another aspect, the invention provides a photocatalytic splice plate, which comprises a substrate and a photocatalytic layer covering the surface of the substrate, wherein the photocatalytic layer is formed by the composite photocatalyst. In some embodiments, the photocatalytic splice plate comprises a substrate and a photocatalytic layer coated on the surface of the substrate, wherein the photocatalytic layer is formed by the composite photocatalyst.
The substrate of the present invention may be a plate-like material. More preferably, the substrate is a KT plate. The KT board is prepared by foaming polystyrene particles to prepare a board core and then laminating the surface of the board core by a film. According to the photocatalytic splicing plate disclosed by the invention, preferably, the substrate is prepared by foaming polystyrene particles to prepare a plate core and laminating a surface coating. The photocatalytic splice plate has small density, controllable volume and convenient carrying and transportation; and such photocatalysis splice plate can be connected through modes such as magnet to can adjust its area wantonly, be applied to different occasions.
In the present invention, a water-based epoxy resin layer may be further included between the substrate and the photocatalytic layer covering the surface of the substrate. The thickness of the water-based epoxy resin layer is 0.5-5 mm. Preferably, the thickness of the water-based epoxy resin layer is 0.5-2 mm. This is advantageous for better recombination of the substrate with the photocatalytic layer.
The photocatalytic splice plate according to the present invention is excellentOptionally, the dosage of the composite photocatalyst is 5-20 g/m2. Preferably, the dosage of the composite photocatalyst is 12-16 g/m2. Thus being beneficial to improving the degradation rate of the photocatalytic splice plate to NO.
In another aspect, the present invention provides a method for preparing the photocatalytic splicing plate, comprising the following steps:
(1) forming the composite photocatalyst into composite photocatalyst dispersion liquid;
(2) coating a water-based epoxy resin on the surface of the substrate to form a water-based epoxy resin layer; and spraying the composite photocatalyst dispersion liquid on the surface of the water-based epoxy resin layer to form the photocatalytic splice plate.
In the invention, the composite photocatalyst is dispersed in a liquid medium to form a composite photocatalyst dispersion liquid. The liquid medium may be deionized water. More preferably, the composite photocatalyst and water are uniformly mixed by means of ultrasound to form the composite photocatalyst dispersion liquid. Thus, a uniform and stable composite photocatalyst dispersion liquid can be formed.
The thickness of the water-based epoxy resin layer can be 0.5-5 mm; preferably 0.5 to 2 mm. This is advantageous for better recombination of the substrate with the photocatalytic layer. When the waterborne epoxy resin is in a semi-cured state, the composite photocatalyst dispersion liquid is sprayed on the surface of the waterborne epoxy resin layer. This is advantageous for better recombination of the substrate with the photocatalytic layer. The dosage of the composite photocatalyst is 5-20 g/m2(ii) a More preferably 12 to 16g/m2. Thus being beneficial to improving the degradation rate of the photocatalytic splice plate to NO.
In the invention, g-C3N4The reaction precursor is compounded with the nano titanium dioxide to form the composite photocatalyst, so that the high NO degradation rate can be achieved. The invention also provides a photocatalytic splice plate, which can achieve higher NO degradation rate. In the preferred embodiment of the present invention, the photocatalytic splicing plate has a wide application range and is convenient to carry and transport.
Drawings
FIG. 1 is a graph showing the change of the ratio of the real-time concentration to the initial concentration of NO of the composite photocatalyst in comparative example and examples 2 to 6 with time;
FIG. 2 is a graph showing the change of the ratio of the real-time concentration to the initial concentration of NO of the composite photocatalyst in examples 7 to 10 with time;
FIG. 3 is a graph showing the change of the ratio of the real-time concentration to the initial concentration of NO of the composite photocatalyst in examples 11 to 15 with time;
FIG. 4 is a graph of NO degradation rates of photocatalytic splice plates of examples 16-20;
FIG. 5 is a graph showing the change of NO concentration with time in the experimental examples.
Detailed Description
In the present invention, NO is used to represent nitrogen oxide NOx。
Photocatalytic NO degradation rate (η) or real-time concentration (C) of NO versus initial concentration (C) in the following examples and comparative examples0) The ratio of (A) to (B) is obtained by the following method:
the inside of the reaction chamber (36 cm. times.21 cm. times.11 cm) was a mixed gas of NO and air, and a 250W metal halide lamp was used as a light source. And putting a sample to be detected into a sealed reaction box body, adjusting the flow rate of air and NO by adopting a mass flow meter, and controlling the initial concentration of NO in the reaction box body to be about 550 ppb. In a dark state, recording the real-time initial concentration C of NO displayed in the Thermo nitrogen oxide tester when the concentration of NO reaches the balance0Then, turning on the light source, monitoring the change condition of the NO real-time concentration C and recording, and recording the NO concentration C when the NO concentration is stabilized again1。
The NO degradation rate (η) was calculated using the following formula:
comparative example
The NO degradation rate was tested according to the above method with nano titanium dioxide as the photocatalyst.
Example 1
(1) The melamine, the nano titanium dioxide and the deionized water are subjected to ultrasonic treatment to form a dispersion, wherein the mass ratio of the melamine to the nano titanium dioxide is 3: 1.
(2) Drying the dispersion formed in step (1) at 60 ℃ and then grinding into a powder; the powder was calcined at 550 ℃ for 3 h.
(3) And cooling the calcined product, and then grinding for the second time to obtain the composite photocatalyst.
Examples 2 to 6
The conditions were the same as in example 1 except for the parameters shown in Table 1. The NO degradation rate of the obtained composite photocatalyst is shown in figure 1. As can be seen from fig. 1, the catalytic efficiency of the nano titanium dioxide photocatalyst in the first five minutes can reach 45%, but the degradation rate of NO over time is significantly lower than that of the composite photocatalyst, which indicates that the composite photocatalyst can actually improve the catalytic efficiency under visible light. When melamine and TiO2When the mass ratio of (A) to (B) is 2-4:1, the NO degradation rate is relatively high. When melamine and TiO2When the mass ratio of (A) to (B) is 3:1, the NO degradation rate is highest, and the NO degradation rate is up to 74% only under 35min visible light irradiation.
TABLE 1
Examples 7 to 10
The conditions were the same as in example 1 except for the parameters shown in Table 2. The NO degradation rate of the obtained composite photocatalyst is shown in fig. 2. As can be seen, the NO degradation rate tends to increase and decrease with temperature. When the calcination temperature is 500-550 ℃, the NO degradation rate is high and can approach 70%.
TABLE 2
Examples 11 to 15
The conditions were the same as in example 1 except for the parameters shown in Table 3. The NO degradation rate of the obtained composite photocatalyst is shown in fig. 3. As can be seen from the figure, the NO degradation rate of the calcination time of 2.5-3.5 h is higher and can reach 70%.
TABLE 3
Examples 16 to 20
(1) Uniformly dispersing the composite photocatalyst prepared in the embodiment 1 in water in an ultrasonic mode to form a composite photocatalyst dispersion liquid;
(2) coating a water-based epoxy resin with the thickness of 1mm on the surface of a KT plate (the length is 20cm, and the width is 15cm) to form a water-based epoxy resin layer; and when the water-based epoxy resin is in a semi-cured state, spraying the composite photocatalyst dispersion liquid on the surface of the water-based epoxy resin layer to form the photocatalytic splice plate. The amounts of the composite photocatalyst used are shown in Table 4. The degradation rate of the photocatalytic splice plate for NO is shown in fig. 4.
TABLE 4
| Serial number | The dosage (g/m) of the composite photocatalyst2) |
| Example 16 | 5 |
| Example 17 | 8 |
| Example 18 | 12 |
| Example 19 | 16 |
| Example 20 | 20 |
As can be seen from the graph, the NO degradation rate shows a trend of increasing and then decreasing with the increase of the dosage of the composite photocatalyst. When the amount is 12-16 g/m2When the amount is small, the NO degradation rate is highest.
Examples of the experiments
The large-scale urban parking lot is taken as an example to illustrate the pollution situation of the parking lot and the application effect of the photocatalytic splicing plate.
And monitoring the NO concentration of the parking lot by adopting a Thermo nitrogen oxide analyzer so as to evaluate the air quality of the parking lot. The area of the parking lot is 23000m2The number of the parking spaces is 445, and the parking amount of the parking spaces from Monday to Friday is about 950. Tests show that the initial average concentration of NO in the parking lot is about 250ppb and is far greater than the daily average concentration limit value of 74.6ppb in GB3095-2012 environmental air quality standard.
The photocatalytic splice plate of example 19 was applied to a wall, with a total area of 8.82m, using a corner of the parking lot with poor air flow2. And recording NO concentration data before and after the lamp is turned on by taking a 250W metal halogen tungsten lamp as a light source. The change in NO concentration before and after lamp-on was compared using paired sample T test, as shown in fig. 5. As shown in table 5, the significance test was 0, indicating a significant change in NO concentration before and after lamp-on. The average value of the difference between the NO concentration after the lamp is turned on and the NO concentration before the lamp is turned on is-24.7 ppb, and the confidence interval of the difference of 95% is-16.9 to-31.7. This indicates that the NO concentration drops by about 24.7ppb under light conditions. The degradation efficiency of the photocatalytic splice plates to NO is about 9.9%. Therefore, the photocatalytic splicing plate can effectively degrade automobile exhaust and improve air quality.
TABLE 5 paired sample test
The present invention is not limited to the above-described embodiments, and any variations, modifications, and substitutions which may occur to those skilled in the art may be made without departing from the spirit of the invention.
Claims (10)
1. The composite photocatalyst is characterized by consisting of g-C3N4Compounding the reaction precursor with nano titanium dioxide; wherein, said g-C3N4The reaction precursor is selected from one or more of melamine and urea.
2. The composite photocatalyst of claim 1, wherein g-C is as defined in claim 13N4The mass ratio of the reaction precursor to the nano titanium dioxide is 0.1-10: 1.
3. The preparation method of the composite photocatalyst as claimed in any one of claims 1-2, characterized by comprising the following steps:
(1) g to C3N4Reacting the precursor, the nano titanium dioxide and the solvent to form a dispersion;
(2) drying the dispersion formed in the step (1), and then grinding into powder;
(3) calcining the powder obtained in the step (2); and cooling the calcined product, and then grinding for the second time to obtain the composite photocatalyst.
4. The method of claim 3, wherein the solvent is deionized water.
5. The method according to claim 3, wherein the drying temperature is 40 to 100 ℃.
6. The preparation method according to claim 3, wherein the calcination temperature is 450-800 ℃ and the calcination time is 2-6 h.
7. A photocatalytic splice plate is characterized by comprising a substrate and a photocatalytic layer covering the surface of the substrate, wherein the photocatalytic layer is formed by the composite photocatalyst as claimed in any one of claims 1 to 2.
8. The photocatalytic splicing plate as set forth in claim 7, wherein the substrate is formed by foaming polystyrene particles to form a core, and laminating the core with a surface coating.
9. The photocatalytic splicing plate as set forth in claim 7 or 8, wherein the amount of the composite photocatalyst is 5-20 g/m2。
10. A method for preparing a photocatalytic splicing plate according to claim 7 or 8, characterized by comprising the following steps:
(1) forming the composite photocatalyst into composite photocatalyst dispersion liquid;
(2) coating a water-based epoxy resin on the surface of the substrate to form a water-based epoxy resin layer; spraying the composite photocatalyst dispersion liquid on the surface of the water-based epoxy resin layer.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112892513A (en) * | 2021-01-25 | 2021-06-04 | 蚌埠学院 | Visible light catalytic air purification catalyst for removing oxynitride and preparation method thereof |
| CN113372044A (en) * | 2021-06-09 | 2021-09-10 | 北京室内桃源新材料科技有限公司 | Green plate and preparation method thereof |
| CN114832803A (en) * | 2022-04-08 | 2022-08-02 | 重庆城市综合交通枢纽（集团）有限公司 | Film-forming composition, preparation method thereof and application of composite photocatalyst |
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| CN114832803A (en) * | 2022-04-08 | 2022-08-02 | 重庆城市综合交通枢纽（集团）有限公司 | Film-forming composition, preparation method thereof and application of composite photocatalyst |
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