Tungsten Quantum Dot Photocatalyst

Photocatalysis, as a new wastewater treatment technology, has shown broad application prospects in the advanced treatment of organic wastewater. In addition, photocatalysts are also widely used in building decoration markets and indoor cars. Photocatalysis process has almost no selectivity for the degradation of organic matter, and can completely mineralize organic pollutants, without secondary pollution.

It was found that tungsten-based catalysts had good catalytic performance. WO₃ was favored because of its low cost and easy availability. The narrow band gap (2.4eV-2.8eV) of WO₃ could make full use of visible light, but its redox ability was weak. The light response range and photocatalytic performance could be further improved by changing WO₃ structure and loading other metals.

In view of the shortcomings of existing technologies, some scholars have provided a tungsten quantum dot photocatalyst to solve the problems of instability of traditional photocatalyst materials and limited photocatalytic effect. The process includes the following steps:

1.Prepare homogeneous solution compounds containing tungsten and titanium, and add precipitator to form colloidal solution.

2.Surface modification agent was used to induce the formation of one dimensional nano particle modifier, and then the three-dimensional network structure gel was formed by aging treatment.

3.Photosensitization, chemical modification and Photoelectrocatalytic treatment of the three dimensional grid structure gel were carried out.

4.The products obtained in step 3 were refluxed and then treated by ultrasound to form tungsten quantum dots photocatalyst.

The degradation efficiency of organic methylene blue was tested by the tungsten quantum dot photocatalyst. It was found that the tungsten quantum dot photocatalyst decomposed methylene blue completely under the action of ultraviolet light, but methylene blue could not be decomposed under the action of ultraviolet light without treatment.

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