Preparation And Properties Of Supported Titanium Dioxide Photocatalyst

At present,TiO₂ photocatalyst shows the disadvantages of difficult recovery,poor choice of adsorption performance and low utilization rate in practical application.In order to overcome these shortcomings,this paper modified TiO₂ photocatalyst and studied the preparation and properties of TiO₂/zeolite L,CdS-TiO₂/zeolite L photocatalyst.With silica sol as raw materials,preparation of zeolite L by hydrothermal synthesis method,using tetrabutyl titanate as raw materials,preparation of TiO₂/zeolite L photocatalyst by sol-gel method.The results showed that zeolite L assumes the circular pie,smooth surface,is about 600 nm in diameter,the thickness of about 200 nm;TiO₂ is successfully wrapped in the surface of zeolite L,and the combination of zeolite L and TiO₂ belongs to chemical bonding by XRD,SEM,EDS,BET,and FTIR characterization analysis.The effects of calcination temperature,loading of TiO₂,radiation time,catalyst quantity,solution of initial concentration,solution pH,different target degradation conditions were studied by degradation of rhodamine B in the Xenon lamp.The results showed that the optimum conditions were as follows:calcination temperature 300?,loading of TiO₂ 15 mmol/g,radiation time 120 min,initial concentration 5 mg/L,catalyst quantity 2 g/L,solution pH=7.In this optimized condition,the degradation rate of TiO₂/zeolite L photocatalyst to rhodamine B solution was 99.86%and higher than that of methyl orange solution under the same conditions.In this paper,the CdS crystal of hexagonal and zinc-zinc ore was prepared by hydrothermal synthesis method with the method of Cd?NO₃?₂·4H₂O as raw material,and the CdS-TiO₂/zeolite L photocatalyst was prepared by sol-gel method with the use of tetrabutyl titanate as raw material.According to the analysis of UV-vis DRS,the doping of CdS makes the catalyst more responsive to visible light and increases its absorption intensity..The effects of doping of CdS,catalyst quantity,solution of initial concentration,solution pH were studied by degradation of rhodamine B in the Xenon lamp.The results showed that the optimum conditions were as follows:doping of Cd S2%,initial concentration 5 mg/L,catalyst quantity 2 g/L,solution pH=6,degradation rate reached 95.60%.The results showed that TiO₂/zeolite L photocatalyst and Cd S-TiO₂/zeolite L photocatalyst were consistent with the first order kinetic equation for degradation of target degradation.At the same time,the results showed that the degradation efficiency of the two catalysts was 96.00%and 90.96%after four repeated experiments.