Photocatalyst for degrading formaldehyde based on complexing stable dispersion, and preparation method and application thereof

A photocatalyst and complexing technology, applied in the field of photocatalyst, can solve the problems of low film-forming adhesion, agglomeration and precipitation, and low dispersion level, and achieve the effects of improving adhesion and uniformity, mild preparation conditions and stable dispersion effect.

Active Publication Date: 2014-12-17
SHENZHEN TIANDEYI ENVIRONMENT TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Disadvantages of existing nano-titanium dioxide dispersions:
[0006]1) The preparation conditions are relatively high, generally requiring high temperature and high pressure (hydrothermal, solvent thermal bonding, etc.), and the production cost is high;
[0007]2) Most of the dispersion level is not high, an

Method used

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  • Photocatalyst for degrading formaldehyde based on complexing stable dispersion, and preparation method and application thereof
  • Photocatalyst for degrading formaldehyde based on complexing stable dispersion, and preparation method and application thereof
  • Photocatalyst for degrading formaldehyde based on complexing stable dispersion, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0048] see figure 1 , the preparation method of the photocatalyst that is used for degrading formaldehyde based on the stable dispersion of complexation provided by the invention, comprises the following steps:

[0049] Step S1, adding 0.005%-1% hydrolysis inhibitor to 0.2%-50% titanium source; the titanium source in this step is butyl titanate, titanium tetrachloride, titanium trichloride or ethyl titanate Any one of them may also be tetraisopropanone titanate, etc.; the hydrolysis inhibitor is any one of glacial esters, acetylacetone, and concentrated hydrochloric acid.

[0050] Step S2, slowly drop the titanium source added with a hydrolysis inhibitor into 48%-98% deionized water to obtain an acidic solution; the conductivity of the deionized water is less than or equal to 1-1.5μS / cm .

[0051] Step S3, adding lye to the solution, and adjusting the pH value of the solution until it is neutral, and the neutralization reaction produces titanic acid precipitation; the lye is...

experiment example 1

[0063] 1. Experimental method:

[0064] 1. Spray a certain amount of nano-titanium dioxide transparent hydrosol sample with a concentration of 0.5% 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 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 warehouse changes less than 10ppb / h, it is regarded as the dark adsorption equilibrium), and 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 to irradiate, and record the formaldehyde concentration in the chamb...

experiment example 2

[0072] 1. Experimental method:

[0073] 1. Spray a certain amount of nano-titanium dioxide transparent hydrosol sample with a concentration of 0.2% 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 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 warehouse changes less than 10ppb / h, it is regarded as the dark adsorption equilibrium), and 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 e...

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Abstract

The invention discloses a photocatalyst for degrading formaldehyde based on complexing stable dispersion, and a preparation method and an application thereof. The photocatalyst comprises 0.2-50wt% of a titanium source, 0.005-1wt% of a hydrolysis inhibitor, 48-98wt% of deionized water, 0.1-25wt% of a crystal form control agent and 2-25wt% of a titanium ion complexing agent; and the photocatalyst is a transparent hydrosol of nanometer titanium dioxide, the pH value of the photocatalyst is 7-8, the particle size of the photocatalyst is 10-30nm, and the crystal form of the photocatalyst is anatase. The combination of the titanium ion complexing agent and the crystal form control agent makes no agglomeration appear among nanoparticles and also makes the nanoparticles not affected by high and low temperature impact; and the complexing agent obviously improves the film formation adhesion and uniformity in the film forming process to make a colorless transparent nanometer titanium dioxide film, and the formed film has good film forming adhesion and no efflorescence shedding phenomenon. The above obtained product in the invention has the advantages of all inorganic components and no secondary pollution, and has a very good catalytic degradation effect on formaldehyde under ultraviolet light even indoor weak light conditions.

Description

technical field [0001] The invention relates to the technical field of photocatalysts, in particular to a photocatalyst based on complexation stable dispersion for degrading formaldehyde, a preparation method and an application thereof. Background technique [0002] As the environmental pollution problem in the current society is gradually highlighted, especially the large area of ​​smog seriously threatens the living environment of human beings. The main hazard of formaldehyde is the irritation to the skin and mucous membranes. When formaldehyde reaches a certain concentration indoors, people will feel uncomfortable. Formaldehyde concentrations greater than 0.08m3 can cause red eyes, itchy eyes, throat discomfort or pain, hoarseness, sneezing, Chest tightness, asthma, dermatitis, etc. The newly decorated room has a high formaldehyde content, which is the main cause of many diseases. Therefore, the control of formaldehyde in the environment is urgent. [0003] Nano-titaniu...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01D53/86B01D53/72
Inventor 不公告发明人
Owner SHENZHEN TIANDEYI ENVIRONMENT TECH
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