A method for preparing zinc tungstate-cadmium sulfide heterojunction photocatalyst

Abstract

The invention relates to a method for preparing a zinc tungstate-cadmium sulfide heterojunction photocatalyst. The method comprises the following steps: preparing a cadmium nitrate solution; dispersing preformed zinc tungstate nanorods into the cadmium nitrate solution; slowly adding a sodium sulfide solution dropwise; filtering, washing and drying to obtain CdS-ZnWO4 heterojunctions. The method is simple, low in cost and capable of conducting synthesis in a large scale; the prepared CdS-ZnWO4 heterojunction nanorods are about 0.5-1.5 micro meters in length and 10-30 nano meters in diameter, and can be used as a photocatalyst for photocatalytically splitting water into hydrogen, and the good hydrogen production effect can be achieved without adopting a co-catalyst.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a method for preparing a zinc tungstate-cadmium sulfide heterojunction photocatalyst. Background technique [0002] In recent decades, with the continuous growth of global energy demand, research on finding new energy sources has attracted more and more attention. Hydrogen energy, as a secondary energy source, has many advantages such as cleanness, high efficiency, safety, storability, and transportability. Pay attention to. Industrial hydrogen production usually adopts unenvironmentally friendly and economical methods such as natural gas steam reforming process. The technology of hydrogen production by photolysis of water began in 1972, when two professors, Fujishima A and Honda K of the University of Tokyo, Japan first reported the discovery of TiO 2 The phenomenon that single-crystal electrodes photocatalytically decompose water to produce hydro...

AI Technical Summary

Problems solved by technology

However, the separation efficiency of pure CdS photogenerated electrons and hole pairs is low, and photocorrosion effects will occur.

while ZnWO 4 It is a relatively stable wide bandgap, and its energy band position also meets the requirements of photocatalytic water splitting for hydrogen production; but ZnWO 4 The gap band is wide, so it can only absorb the energy of ultraviolet light, accounting for only 3% to 5% of the total energy, which largely limits its wide application in photocatalysis.

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