Preparation method of tungsten-oxide photocatalyst for ambient-air purification

Abstract

The invention discloses a preparation method of a tungsten-oxide photocatalyst for ambient-air purification. The preparation method comprises the following steps of: (a) adding chitosan into metal salt solution, and carrying out electromagnetic stirring at a constant temperature to form a complex; (b) dispersing the obtained chitosan and metal-ion complex and citric acid into tungsten-source aqueous solution, heating for reaction to prepare chitosan-loaded tungsten-oxide precursor solution; (c) placing into a photoreaction tube to carry out electron beam irradiation so as to improve the forbidden bandwidth of tungsten oxide; (d) centrifugally separating, washing and drying to obtain the chitosan-loaded tungsten-oxide photocatalyst. The preparation method disclosed by the invention has thefollowing beneficial effects that the electron beams are utilized to change the surface structure of the tungsten oxide, so that the forbidden bandwidth is improved, the utilization rate, the photocatalytic activity and the catalytic efficiency of visible light are improved; by addition of the chitosan, not only is the effect of photocatalytic degradation of organic matters improved, but also thefunction of adsorbing purification is added; simultaneously, the preparation method is simple in preparation process, low in cost and good in environment friendliness, and can be widely used for the field of air purification.

Description

technical field [0001] The invention relates to the field of air purification, in particular to a preparation technology of a photocatalyst, in particular to a preparation method of a tungsten oxide photocatalyst used for ambient air purification. Background technique [0002] As the problem of air pollution is becoming more and more serious, in the air purification technology, photocatalytic air purification technology is an emerging research field developed in recent years. This method can react under normal temperature and pressure, and the reaction rate is fast; No other energy consumption; easy to achieve complete oxidation; photocatalyst can achieve continuous treatment and use. Because of its generally good degradation effect on gas-phase volatile organic compounds, and its oxidative and removal effect on inorganic pollutants in the air, it also has a good killing effect on bacteria and viruses exposed to the air. much attention and wide application. [0003] The ke...

AI Technical Summary

Problems solved by technology

[0008] It can be seen that the tungsten oxide photocatalyst in the prior art has insufficient band gap and low utilization rate of visible light. Due to its fast recombination speed and high recombination rate of photogenerated electrons and holes, its photocatalytic activity is low, and there are serious problems. Photocorrosion phenomenon can easily cause secondary pollution and photocatalytic function reduction or even loss. However, the traditional technology of improving the photocatalytic ability of tungsten oxide by surface modification or compounding with other materials is more complicated, difficult and costly.