Nanometer spherical porous weak light photocatalyst for degrading nitrogen oxide, and preparation method and application thereof

Abstract

The invention discloses a nanometer spherical porous weak light photocatalyst for degrading nitrogen oxide, and a preparation method and an application thereof. The photocatalyst comprises 0.2-35wt% of a titanium source, 64-99wt% of an alcohol solvent, 0.005-0.01wt% of a hydrolysis inhibitor, 0.005-0.01wt% of metal ion-containing deionized water, 5-50wt% of hydroxy group-containing mediate strong acid, and 1-5wt% of inorganic dispersant-containing deionized water, and the hydroxy group-containing mediate strong acid contains SiO2 crystal seeds; and the photocatalyst is a transparent sol liquid of nanoparticles, the particle size of the transparent sol liquid is 10-30nm, the surface of the photocatalyst is spherical porous distribution, and the specific surface area of the photocatalyst is large, and is above 300m<2> / g averagely. The photocatalyst has the advantages of mild production preparation conditions, small production safety risk, easy realization of batch production, weak light catalytic purification and high stability, and solves the problems of strict preparation conditions, low sunshine utilization rate, low air purifying and degrading efficiency, large base material apparent influence, construction inconvenience and the like of present mature photocatalyst products.

Description

technical field

[0001] The invention relates to the technical field of photocatalysts, in particular to a nano-spherical porous low-light photocatalyst for degrading nitrogen oxides, a preparation method and an application thereof. Background technique

[0002] At present, the problem of environmental pollution is prominent, especially the large area of ​​smog seriously threatens the living environment of human beings, and the control of ambient air is urgent. Photocatalyst, as an emerging environmental protection material suitable for air purification, has been more and more extensively studied. However, most of the existing technologies are laboratory research and development products, and ultraviolet light or visible light is used as the energy excitation source. Nitrogen oxides are a class of small molecular gases that form smog. Nitrogen oxides include compounds such as nitrous oxide (N 2 O), nitric oxide (NO), nitrogen dioxide (NO 2 ), nitrogen trioxide (N 2 o ...

Examples

preparation example Construction

[0061] see figure 1 A method for preparing a nano-spherical porous weak-light photocatalyst for degrading nitrogen oxides provided by the invention comprises the following steps:

[0062] Step S1, mixing 0.2%-35% titanium source with 64%-99% alcohol solvent to form a mixed solution; in this step, the titanium source is n-butyl titanate, titanium tetrachloride, titanium trichloride, Any one of titanyl sulfate or ethyl titanate, the number of carbons in the alcohol solvent is 1-4, and it is absolute ethanol, n-propanol, isopropanol, n-butanol, sec-butanol or isobutanol any of the alcohols.

[0063] Step S2, adding 0.005%-0.01% hydrolysis inhibitor into the mixed solution, stirring vigorously and synchronously slowly dropping 0.005%-0.01% deionized water containing metal ions to form a sol; in this step, the hydrolysis inhibitor The agent is any one of glacial ester, acetylacetone, and concentrated hydrochloric acid, and the metal ion in deionized water containing metal ions i...

experiment example 1

[0078] 1. Experimental method:

[0079] 1. Spray a certain amount of 0.5% nanoparticle transparent sol solution on a glass plate of 1 square meter, place it in a glass experimental chamber of 1.5 cubic meters, and fill it with a certain amount of standard concentration of nitrogen oxides under darkroom conditions Gas, and start the air circulation pump in the chamber, stop filling the nitrogen oxide standard gas when the concentration of nitrogen oxides in the chamber is stable at 160ppb. After the dark adsorption equilibrium (the process time is generally 0.5-1h, when the gas concentration change in the chamber is less than 4ppb / h, it is regarded as the dark adsorption equilibrium), and then test the NO and NO in three times within the next 1.5h. 2 concentration and record it. After the test, turn on the fluorescent lamp (wavelength range 400-800nm) in the warehouse for irradiation. Record NO and NO in the box every half hour 2 concentration.

[0080] 2. Experimental env...

experiment example 2

[0087] 1. Experimental method:

[0088] 1. Spray a certain amount of transparent sol solution with a concentration of 0.2% nanoparticles on a glass plate of 1 square meter, place it in a glass experimental chamber of 1.5 cubic meters, and fill it with a certain amount of standard concentration of nitrogen oxides under darkroom conditions Gas, and start the air circulation pump in the chamber, stop filling the nitrogen oxide standard gas when the concentration of nitrogen oxides in the chamber is stable at 160ppb. After the dark adsorption equilibrium (the process time is generally 0.5-1h, when the gas concentration change in the chamber is less than 4ppb / h, it is regarded as the dark adsorption equilibrium), and then test the NO and NO in three times within the next 1.5h. 2 concentration and record it. After the test, turn on the fluorescent lamp (wavelength range 400-800nm) in the warehouse for irradiation. Record NO and NO in the box every half hour 2 concentration.

[0...

technical field

[0001] The invention relates to the technical field of photocatalysts, in particular to a nano-spherical porous low-light photocatalyst for degrading nitrogen oxides, a preparation method and an application thereof. Background technique

[0002] At present, the problem of environmental pollution is prominent, especially the large area of ​​smog seriously threatens the living environment of human beings, and the control of ambient air is urgent. Photocatalyst, as an emerging environmental protection material suitable for air purification, has been more and more extensively studied. However, most of the existing technologies are laboratory research and development products, and ultraviolet light or visible light is used as the energy excitation source. Nitrogen oxides are a class of small molecular gases that form smog. Nitrogen oxides include compounds such as nitrous oxide (N 2 O), nitric oxide (NO), nitrogen dioxide (NO 2 ), nitrogen trioxide (N 2 o ...

Examples

preparation example Construction

[0061] see figure 1 A method for preparing a nano-spherical porous weak-light photocatalyst for degrading nitrogen oxides provided by the invention comprises the following steps:

[0062] Step S1, mixing 0.2%-35% titanium source with 64%-99% alcohol solvent to form a mixed solution; in this step, the titanium source is n-butyl titanate, titanium tetrachloride, titanium trichloride, Any one of titanyl sulfate or ethyl titanate, the number of carbons in the alcohol solvent is 1-4, and it is absolute ethanol, n-propanol, isopropanol, n-butanol, sec-butanol or isobutanol any of the alcohols.

[0063] Step S2, adding 0.005%-0.01% hydrolysis inhibitor into the mixed solution, stirring vigorously and synchronously slowly dropping 0.005%-0.01% deionized water containing metal ions to form a sol; in this step, the hydrolysis inhibitor The agent is any one of glacial ester, acetylacetone, and concentrated hydrochloric acid, and the metal ion in deionized water containing metal ions i...

experiment example 1

[0078] 1. Experimental method:

[0079] 1. Spray a certain amount of 0.5% nanoparticle transparent sol solution on a glass plate of 1 square meter, place it in a glass experimental chamber of 1.5 cubic meters, and fill it with a certain amount of standard concentration of nitrogen oxides under darkroom conditions Gas, and start the air circulation pump in the chamber, stop filling the nitrogen oxide standard gas when the concentration of nitrogen oxides in the chamber is stable at 160ppb. After the dark adsorption equilibrium (the process time is generally 0.5-1h, when the gas concentration change in the chamber is less than 4ppb / h, it is regarded as the dark adsorption equilibrium), and then test the NO and NO in three times within the next 1.5h. 2 concentration and record it. After the test, turn on the fluorescent lamp (wavelength range 400-800nm) in the warehouse for irradiation. Record NO and NO in the box every half hour 2 concentration.

[0080] 2. Experimental env...

experiment example 2

[0087] 1. Experimental method:

[0088] 1. Spray a certain amount of transparent sol solution with a concentration of 0.2% nanoparticles on a glass plate of 1 square meter, place it in a glass experimental chamber of 1.5 cubic meters, and fill it with a certain amount of standard concentration of nitrogen oxides under darkroom conditions Gas, and start the air circulation pump in the chamber, stop filling the nitrogen oxide standard gas when the concentration of nitrogen oxides in the chamber is stable at 160ppb. After the dark adsorption equilibrium (the process time is generally 0.5-1h, when the gas concentration change in the chamber is less than 4ppb / h, it is regarded as the dark adsorption equilibrium), and then test the NO and NO in three times within the next 1.5h. 2 concentration and record it. After the test, turn on the fluorescent lamp (wavelength range 400-800nm) in the warehouse for irradiation. Record NO and NO in the box every half hour 2 concentration.

[0...

Images