Preparation of tungsten/titanium oxide photocatalytic material based on SiO2 with large specific surface area

Abstract

The invention discloses a method for degrading organic pollutants in water by using a WO3-TiO2 photocatalytic material based on SiO2 aerosol. The photocatalytic material can effectively utilize solarlight to degrade petroleum contaminants in surface water bodies, can be used for surface water pollution control, and belongs to the field of water pollution control. The method mainly utilizes the very-large specific surface area of the SiO2 aerosol and the higher visible light utilization efficiency of WO3 and efficiently utilizes sunlight to generate free radicals to degrade the petroleum contaminants in the water bodies. The method has the following advantages that (1) the prepared material has the very-large specific surface area which is larger than 400 m<2>/g, and a large number of exposed active sites can achieve efficient free radical generation and pollutant degradation; (2) the combination of the SiO2 aerosol and the TiO2 can effectively reduce the recombination (energy loss) ofphotogenerated electron-hole during catalysis, while doping of a small amount of WO3 can achieve efficient solar light utilization efficiency, and the organic pollutants in the water bodies are efficiently removed under energy-saving and environment-friendly conditions; (3) the material has high stability in water, is easy to recycle, and reduces the generation of secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis and relates to the synthesis of a SiO 2 Aerosol-based WO 3 -TiO 2 Photocatalytic materials, and use them to catalytically degrade organic pollutants in surface water under sunlight. Background technique [0002] With the development of society, a large number of natural or synthetic organic pollutants have entered natural water bodies, posing a major threat to the health of the ecological environment. At present, there are many types of organic pollutants with complex components, and some organic pollutants are carcinogenic, teratogenic and mutagenic, which pose a serious threat to aquatic organisms and human health. At present, traditional treatment methods, such as electrolysis, membrane, Fenton reaction, activated carbon adsorption and other methods, have exposed various defects in the removal of organic pollutants in natural water bodies, such as high energy consumption, high cost of...

AI Technical Summary

Problems solved by technology

However, the natural photodegradation of pollutants is very slow. Therefore, it is of great significance to develop photocatalysts with high solar photoactivity to enhance the degradation of pollutants in natural water bodies.

Traditional TiO 2 Photocatalytic materials can only use the ultraviolet part of sunlight, and ultraviolet light only accounts for about 5% of the total energy of sunlight

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