Photocatalyst solution for formaldehyde degradation under visible light, and preparation method thereof

Abstract

The present invention discloses a photocatalyst solution for formaldehyde degradation under visible light, and a preparation method thereof. The raw materials comprise, by mass, 0.05-1% of nanometer titanium oxynitride, 1-5% of a silane coupling agent, 1-5% of an anionic or cationic surfactant, 1-5% of an anchor chain polymer dispersant, and 84-96.95% of deionized water. According to the present invention, based on the difficult dispersion of the nanometer titanium oxynitride in the deionized water, the nanometer powder is subjected to surface modification; the coupling agent is adopted to organically modify the nanometer titanium oxynitride, such that the nanometer powder surface is wrapped with a layer of the organic molecular film so as to increase the steric hindrance effect of the nanometer titanium oxynitride during the dispersion; the anionic or cationic surfactant is added to the nanometer titanium oxynitride solution, and the surfactant compounding is adopted to make the nanometer powder can be uniformly dispersed in the solution so as to reduce the sedimentation of the nanometer powder in the water; the photocatalyst solution of the present invention can lastingly and efficiently degrade the formaldehyde under the visible light, and the formaldehyde removal rate can achieve 87%; and the nanometer technology is adopted to degrade the formaldehyde, such that characteristics of stability, no toxicity and no harm on the environment are provided.

Description

technical field [0001] The invention relates to a photocatalyst solution and a preparation method thereof, in particular to a photocatalyst solution capable of continuously and efficiently degrading formaldehyde under visible light and a preparation method thereof, belonging to the fine chemical industry field. Background technique [0002] Photocatalyst (photocatalyst) is a compound word of light (photo=light) + catalyst (catalyst). Photocatalyst is usually the full name of photo-semiconductor materials with photocatalytic function of small particles of micron or even nanometer scale. It is the most ideal material for domestic and international control of indoor environmental pollution and formaldehyde pollution. [0003] Under the irradiation of sunlight or light, the photocatalyst will produce the same photoreaction as photosynthesis, and produce free H with strong oxidation ability. - and reactive oxygen species 2- , has a strong photoredox function, can oxidize and de...

AI Technical Summary

Problems solved by technology

Due to the wide band gap of titanium dioxide (Eg=3.2ev), only ultraviolet rays with wavelengths less than 387.5nm can be absorbed and utilized, and this part of ultraviolet rays (300-400nm) in sunlight only accounts for 4% of the sunlight reaching the ground. -6%, so the utilization of solar energy is very low

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