Tantalum-tungsten mixed polyoxometallate photocatalyst for generating hydrogen activity and preparation method thereof

Abstract

The invention belongs to the field of inorganic chemistry and photocatalysis, and particularly relates to a preparation method of a tantalum-tungsten mixed polyoxometallate photocatalyst with efficient hydrogen producing activity, and an application thereof to hydrogen production under photocatalysis. A synthetic method of the catalyst comprises the following steps of: enabling K8[Ta6O19] react with Na12[a-P2W15O56] in a stoichiometric ratio at the temperature of 45 DEG C in the presence of hydrogen peroxide to obtain yellow powder; dissolving the powder into an acid solution, and reflowing to obtain a colorless solution; and standing for a week to obtain a crystal product of an expected photocatalyst, wherein the structure and composition of the crystal product are determined through monocrystalline X-ray analysis. The catalyst is water-soluble and is kept stable, and the hydrogen producing rate is kept at 375mu.molh<-1> in 36 hours. In the currently-reported polyacid photocatalyst, the hydrogen producing rate and duration of the catalyst are maximized.

Description

technical field [0001] The invention belongs to the field of inorganic chemistry and photocatalysis, and in particular relates to a preparation method and application of a tantalum-tungsten mixed polyoxometalate photocatalyst with high-efficiency hydrogen production activity. Background technique [0002] Energy crisis and environmental degradation are two major problems facing human society. With the increasing demand of human beings for energy, the development of fossil fuels such as coal, oil, and natural gas has become increasingly exhausted. At the same time, the excessive use of fossil fuels has also caused serious threats to the ecological environment. The thermal efficiency of hydrogen is three times that of ordinary gasoline, and the combustion product is water, which has no pollution to the environment. It is an ideal energy source. Therefore, countries all over the world have studied hydrogen as a strategic energy source and invested a lot of energy. People pay ...

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Problems solved by technology

Therefore, the synthesis of tantalum-containing polyacids has always been a great challenge

Furthermore, the above are based on [Ta 6 o 19 ] 8? The polyacid derivatives are only stable under strong alkaline conditions, and the organic components contained in the molecules are easily oxidized and decomposed by photogenerated holes under photocatalytic conditions, so it is difficult to apply to photocatalytic reactions.

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