Preparation method of copper sulfide-zinc oxide composite photocatalytic film

Abstract

The invention belongs to the field of photocatalysis, and relates to a photocatalytic film, in particular to a preparation method of a copper sulphide-zinc oxide composite photocatalytic film, the composite photocatalytic film is composed of a zinc oxide film and a copper sulphide film, and a zinc oxide-copper sulphide composite layer is formed on the connecting surface of the zinc oxide film and the copper sulphide film; the invention also provides the corresponding preparation method. The defects that existing zinc oxide is small in response interval, high in recombination speed and the like are overcome, visible light is converted into an ultraviolet light area through zinc sulfide of the composite layer, corresponding requirements of zinc oxide are met, meanwhile, zinc sulfide rapidly transmits electrons of zinc oxide, combination of holes and the electrons is slowed down, and through electron transfer, copper sulfide and zinc oxide are promoted to form a synergistic effect based on electron transfer.

Description

technical field [0001] The invention belongs to the field of photocatalysis and relates to a photocatalysis film, in particular to a preparation method of a copper sulfide-zinc oxide composite photocatalysis film. Background technique [0002] Zinc oxide is a photocatalytic material with many superior properties, and it is also a new type of environmentally friendly material that has been widely studied. Its semiconductor wide bandgap is about 3.3eV, and it is non-toxic and low-cost, so it can be widely used. Zinc oxide can destroy various organic pollutants through photo-assisted catalysis; finally oxidize refractory organic substances into inorganic substances such as carbon dioxide and water; it can oxidize and remove almost all organic pollutants in water. However, the photocatalytic properties of zinc oxide are limited to the ultraviolet band, resulting in a low efficiency (less than 3%) for photocatalytic decomposition of direct use of sunlight; in addition, due to h ...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems in the prior art, the present invention provides a method for preparing a copper sulfide-zinc oxide composite photocatalytic film, which solves the defects of the existing zinc oxide response range such as small response range and fast composite speed, and utilizes the zinc sulfide of the composite layer to convert visible light It is transformed into the ultraviolet region to meet the corresponding requirements of zinc oxide. At the same time, zinc sulfide quickly transfers the electrons of zinc oxide, slowing down the combination of holes and electrons, and the transfer of electrons promotes the synergy between copper sulfide and zinc oxide based on electron transfer.