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

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...

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, and they will aggregate and precipitate after a long storage time;

[0009]4) The adhesion of the film is not high and easy to lose;

[0010]5) The catalytic efficiency actually used is low, and there is almost no degradation effect under indoor / weak light conditions;

[0011]6) Cannot effectively degrade formaldehyde gas

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