Preparation And Performance Study Of Modified Tin Oxide Composite Photocatalyst

With the development of science and technology,environmental pollution has becomes more and more serious,especially water pollution.Therefore,finding green and convenient ways to solve the problem of water pollution has become the main focus of researchers.Photocatalysis technology has been paid more and more attention because of its high efficiency and pollution-free.Sn O₂is a semiconductor material with wide bandgap and exists in nature in the form of cassiterite.Usually,Sn O₂is in the form of white powder.It has attracted much attention from researchers because of its stability and low cost.This paper mainly takes Sn O₂as the research object.Based on the understanding of the preparation method,the modified tin oxide can make full use of visible light to improve the performance of the catalyst and the response range to light.The modification is mainly studied from three aspects:Bi OCl/Zn O/Sn O₂photocatalyst、Zn（IO₃）₂/Bi₂O₃/Sn O₂photocatalyst and Bi₁₂Zn O₂₀/Bi₃O₄Br/Sn O₂photocatalyst.In order to analyze the photocatalytic activity of the produced products,the time,temperature and feed ratio were changed.In order to obtain the degradation rate of catalyst,the experiment chose LED lamp and 10mg/L Rh B as the light source and target degradation.After testing,the degradation rate of Rh B by Bi OCl/Zn O/Sn O₂、Zn（IO₃）₂/Bi₂O₃/Sn O₂and Bi₁₂Zn O₂₀/Bi₃O₄Br/Sn O₂after 7 W LED irradiation for 180min was 96.92%、99.5%、99.29%.The product was characterized by XRD phase analysis,and the morphology of the product was characterized by sem.In order to further explore the main factors affecting the photocatalyst activity,the specific surface area and photoluminescence performance were tested.The results showed that under the best conditions,the sample had the largest specific surface area,the lowest electron hole recombination rate and the highest degradation rate of Rh B.In order to improve the utilization rate of the catalyst,cyclic degradation experiments were carried out on the catalyst.After three cycles,the degradation rate of the catalyst still reached more than 75%.