In recent years, scientists have discovered a series of photoresponsive tungstate photocatalysts, such as bismuth tungstate, zinc tungstate, silver tungstate, etc. Semiconductor materials such as tungstate, because of their unique structure and physical and chemical properties, have been paid more and more attention by people, and the research is very active. Zinc tungstate is usually used as a semiconducting catalyst for the degradation of halogenated phenylenes and water pollutants. The synthesized zinc tungstate nanostructure has good dispersion and identity, high specific surface area, surface permeability and high specific surface area, and can provide more molecular adsorption points. The prepared zinc tungstate nanostructures have potential photocatalytic properties. The valence band of the tungstate semiconductor is hybridized by the outermost s of metal atoms and the 2p orbital of O, which has high oxidation activity and charge mobility.
Different from doped titanium dioxide, tungstate photocatalysts have steeper band absorption edges in the ultraviolet-visible region, indicating that their light absorption is generated by their own interband transitions rather than the role of impurity levels, effectively The recombination center formed by impurities is avoided to reduce the catalytic efficiency. At the same time, most of the tungstate photocatalysts containing WO6 have a unique layered structure, so that the catalytic reaction is mainly carried out in the interlayer space, playing a “two-dimensional” photocatalytic effect, and their photocatalytic activity will also be affected by the interlayer molecules or It is a new type of highly efficient heterogeneous photocatalyst. Therefore, the study of tungstate semiconductor photocatalysts opens up a new avenue for the development of photocatalytic removal and degradation of organic pollutants and water splitting.
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