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Nano-spherical porous low-light photocatalyst for degrading formaldehyde, preparation method and application thereof

A low-light, spherical technology, applied in the field of photocatalyst, can solve the problems of complex load forming process, difficulty in industrialization, easy pulverization and falling off, etc., to improve the utilization rate of natural visible light, get rid of the restrictions of use occasions, and improve film adhesion Good results

Active Publication Date: 2017-01-25
SHENZHEN TIANDEYI ENVIRONMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009]2) Adopt the "passive contact degradation" mode, which is highly dependent on light intensity, "work with light, stop without light", almost no degradation effect under low light conditions, the overall Low purification effect;
[0010]3) The production equipment and conditions are demanding, the cost is high, the efficiency is low, and industrialization is difficult;
[0011]4) Most of them have undergone high-temperature sintering process, and the form of powdered products greatly limits their application fields and scope;
[0012]5) The loaded molding process is complicated, the film-forming adhesion is not high, it is easy to pulverize and fall off, and the appearance requirements of the substrate cannot be met. There are inevitably organic substances in the ingredients, and there are Risk of Secondary Pollution

Method used

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  • Nano-spherical porous low-light photocatalyst for degrading formaldehyde, preparation method and application thereof
  • Nano-spherical porous low-light photocatalyst for degrading formaldehyde, preparation method and application thereof
  • Nano-spherical porous low-light photocatalyst for degrading formaldehyde, preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0049] see figure 1 , the preparation method of the nano-spherical porous weak light photocatalyst that is used to degrade formaldehyde provided by the invention, comprises the following steps:

[0050] Step S1, mixing 0.2%-30% titanium source with 60%-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.

[0051] 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, concentrated hydrochloric acid, and concentrated nitric acid, and the metal ion in...

experiment example 1

[0066] 1. Experimental method:

[0067] 1. Spray a certain amount of 0.5% nanoparticle transparent sol solution sample on a 1 square meter glass plate, place it in a 1.5 cubic meter glass experimental chamber, and fill it with a certain amount of standard concentration of formaldehyde gas under darkroom conditions , and start the air circulation pump in the warehouse, and stop filling the formaldehyde standard gas when the formaldehyde concentration in the warehouse is stable at 510ppb. After the dark adsorption equilibrium (the process time is generally 0.5-1h, when the gas concentration in the chamber changes less than 10ppb / h, it is regarded as the dark adsorption equilibrium), the internal formaldehyde concentration is measured three times within the next 1.5h, and recorded. After the test, turn on the fluorescent lamp (wavelength range 400-800nm) in the warehouse for irradiation. Record the formaldehyde concentration in the box every half hour.

[0068] 2. Experimental ...

experiment example 2

[0075] 1. Experimental method:

[0076] 1. Spray a certain amount of 0.2% nanoparticle transparent sol solution sample on a 1 square meter glass plate, place it in a 1.5 cubic meter glass experimental chamber, and fill it with a certain amount of standard concentration of formaldehyde gas under darkroom conditions , and start the air circulation pump in the warehouse, and stop filling the formaldehyde standard gas when the formaldehyde concentration in the warehouse is stable at 510ppb. After the dark adsorption equilibrium (the process time is generally 0.5-1h, when the gas concentration in the chamber changes less than 10ppb / h, it is regarded as the dark adsorption equilibrium), the internal formaldehyde concentration is measured three times within the next 1.5h, and recorded. After the test, turn on the fluorescent lamp (wavelength range 400-800nm) in the warehouse for irradiation. Record the formaldehyde concentration in the box every half hour.

[0077] 2. Experimental ...

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Abstract

The invention discloses a nanometer spherical porous weak light photocatalyst for degrading formaldehyde, and a preparation method and an application thereof. The photocatalyst comprises 0.2-30wt% of a titanium source, 60-99wt% of an alcohol solvent, 0.005-0.01wt% of a hydrolysis inhibitor, 0.005-0.01wt% of metal ion-containing deionized water, 10-40wt% 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 weak-light photocatalyst for degrading formaldehyde, 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 use ultraviolet light or visible light as the energy excitation source. In terms of application, the treatment of water body pollutants is the main application. The products actually used for the degradation of formaldehyde pollutants are almost blank. The main hazard of formaldehyde is ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J35/10B01J21/06B01J23/18B01J23/26B01J23/02B01J23/04B01D53/72B01D53/86
Inventor 不公告发明人
Owner SHENZHEN TIANDEYI ENVIRONMENT TECH
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