Preparation And Properties Of Photocatalytic Materials Based On High Stability And Selectivity

With the advancement of science and technology and the rapid development of human society,environmental issues and energy crises have become the focus of attention.Semiconductor photocatalytic materials can convert solar energy into chemical energy,and can purify the environment through reactions such as oxidation of sulfides.Photocatalytic technology plays an important role in solving energy shortages and environmental pollution.Therefore,the research and development and application of photocatalytic technology have attracted widespread attention from researchers all over the world.However,photocatalysts still have problems such as low photon absorption efficiency and carrier separation efficiency so far.Therefore,the preparation of stable,efficient,and green photocatalytic materials has become the key technology to improve photocatalytic performance.Around these problems,researchers have carried out different modification studies on photocatalysts.For example:doping,constructing a heterojunction structure to improve the activity of photocatalysts can better improve the problem of low performance of photocatalytic materials.This study uses the reduction and oxidation capabilities of catalysts to produce hydrogen in photocatalysis（energy catalysis）and oxidation sulfide（environmental catalysis）are studied and explored,combined with a series of characterization methods such as Diffraction of X-Rays,X-Ray Photoelectron Spectroscopy,etc.To test the structure and photocatalytic performance of the synthesized photocatalytic materials.Research in the field of photocatalysis provides research and development ideas.The inorganic non-noble metal ReS₂ was used as a co-catalyst to be supported on the Zn_xCd_1-xS nanorods by the secondary hydrothermal method to achieve efficient and stable H₂ release.The composite ReS₂/Zn_xCd_1-xS photocatalytic material has higher photocurrent response intensity and longer fluorescence lifetime.The best photocatalytic hydrogen production rate of ReS₂/Zn_0.3Cd_0.7S is 92.45 mmol g^-1·h^-1,and the best quantum efficiency at 400 nm is 23.24%.Moreover,after 30 h of photocatalytic reaction,the photocatalytic activity did not decrease significantly,and the catalyst prepared by this method can be released again after recovery.The reason for the improvement of catalytic performance is that when Zn element is added to Cd S,photocorrosion can be suppressed,and they can act synergistically with surface ReS₂ to show better photocatalytic performance.The Bi₄O₅Br₂ bismuth-rich photocatalytic material was synthesized by hydrothermal method,and the Bi₄O₅Br₂ bismuth-rich catalyst was used as the photocatalytic material for photo-oxidation in oxygen-containing water.A photocatalytic system that efficiently and selectively oxidizes sulfide to sulfoxide under blue irradiation is realized.At the same time,high yields of different types of sulfoxide products were obtained in a relatively short time.Moreover,after the catalyst is recycled for many times,it still maintains high-efficiency catalytic activity after recycling.The research of this work provides a simple,reliable,green and sustainable candidate photocatalytic material for the practical application of sulfide oxidation.