Bismuth oxybromide/silver silicate composite photocatalytic material and application

Abstract

The invention discloses a bismuth oxybromide / silver silicate composite photocatalytic material and application. The composite photocatalytic material is of a composite structure of n-type silver silicate supported on the surface of a p-type bismuth oxybromide substrate, and is prepared by a simple precipitation method. The novel photocatalytic material is relatively high in photocatalytic activityand photocatalytic efficiency. Experiments show that the degradation properties of the photocatalytic composite material to organic matters are significant. In the irradiation of visible light, the composite photocatalytic material can be applied to the degradation of the organic matters in organic waste water, such as the treatment of the organic waste water containing phenol, methyl orange, rhodamine B and other organic pollutants.

Description

technical field [0001] The invention belongs to the technical field of environmental chemical photocatalytic water treatment, and in particular relates to a bismuth oxybromide / silver silicate composite photocatalytic material and its application. Background technique [0002] At present, energy shortage and environmental pollution worldwide are two major threats to the sustainable development of human society. Finding sustainable and clean energy alternatives to fossil fuels is key to addressing both threats. The newly developed semiconductor photocatalyst technology can use sunlight as energy to split water, generate clean energy hydrogen and oxygen, and can also degrade and remove organic pollutants and inorganic heavy metals. However, the current research on photocatalytic materials still faces three important problems that limit their practical applications. [0003] First, the photoresponse range is narrow, and traditional semiconductor photocatalytic materials with h...

AI Technical Summary

Problems solved by technology

However, the current research on photocatalytic materials still faces three important problems that limit their practical applications.

[0003] First, the photoresponse range is narrow, and traditional semiconductor photocatalytic materials with high activity, such as titanium dioxide, have a wide energy band (3.2eV) and can only absorb ultraviolet light, which accounts for about 4% of the total energy of the solar spectrum, and cannot utilize solar energy. Most of the visible light, resulting in low solar energy efficiency

[0004] Second, the quantum efficiency is low. The photogenerated electrons and holes generated by the semiconductor under light recombine rapidly inside or on the surface of the semiconductor, which cannot effectively participate in the photocatalytic process, which greatly reduces the quantum efficiency of the photocatalytic reaction.

[0005] Third, nano-scale catalytic materials have better photocatalytic performance, but may cause secondary pollution during the reaction process

Images