Preparation,Characterization And Photoelectrocatalytic Performance Of ZnTiO₃-TiO₂ Loaded By Organic Pillared Montmorillonite

Photocatalyst is the key factor of Photocatalytic technology.TiO₂ has the advantages of cheap and non-toxic nature,high catalytic activity,strong oxidation ability,good stability and so on.It is also a high efficient and environmental friendly material,and has broad development and application prospect.In this paper,ZnTiO₃-TiO₂ prepared by sol gel method,and the organic montmorillonite by the ion exchange method were composited for a new material.To provide relevant theoretical basis for the comprehensive application of the new materials in the field of photocatalysis,the physical and chemical properties of ZnTiO₃-TiO₂ and Zn TiO₃-TiO₂/pMt composite was studied in data through a variety of modern analytical techniques.Also,the mechanism of its application in photocatalysis was explored.The main conclusions are as follows: 1.ZnTiO₃-TiO₂ was successfully prepared by the sol-gel method,and the physical and chemical properties of the materials were characterized by XRD,Raman,UV-Vis,SEM,TEM,XPS potential and so on.The results showed that the different preparation conditions would influence the surface morphology and crystalline phase composition of ZnTiO₃-TiO₂ samples,which resulted in a change in the photocatalytic performance.In this study,the optimum preparation conditions of ZnTiO₃-TiO₂ were 600 ? in the temperature,3 h the calcination time,and 1:1 in the [Zn+2]/[Ti+4] mole ratio.2.The experimental results of ZnTiO₃-TiO₂ photocatalytic degradation of phenol solution showed that the preparation conditions,dosage,pH value and other factors would affect the catalyst photocatalytic performances;the experiments results of radical scavenging showed that strong oxidation of·OH and O₂·-radicals were involved in the photocatalytic degradation process of phenol solution;the experiments results of cycle showed that the sample ZT-3has good stability.3.By the use of ion exchange,series of alkyl quaternary ammonium ion pillared montmorillonite were successfully prepared,and the organic pillared montmorillonite physical and chemical properties were analyzed by XRD,FT-IR,BET,SEM and Zeta potential characterization methods.The results showed that by alkyl quaternary ammonium ionic pillared modification,specific surface area and pore volume of montmorillonite decreased,but the interlayer space,average size,zeta potential negative increased.Beside,FT-IR spectra of the three new absorption peak and peak intensity increased with the increase of the carbon chain of alkyl quaternary ammonium ion.4.ZnTiO₃-TiO₂/pMt composite was composited by ZnTiO₃-TiO₂ and organic montmorillonite,of which the physical and chemical properties were investigated by various characterization methods.The results show that the successful composite of ZnTiO₃-TiO₂ and montmorillonite was achieve by chemical action.ZnTiO₃-TiO₂/pMt composites exhibited polymorphic mixed crystal structure,which had a very good response to visible irradiation,and a consistent distribution of Zn and Ti elements.The experimental results of photocatalytic degradation of methylene blue solution showed that the ZnTiO₃-TiO₂/pMt composite could exhibit a very high photocatalytic degradation rate under the condition of visible irradiation,but its rate under UV conditions mainly depended on its adsorption performance.Also,only O₂·-free radical and photo-induced hole h+ were involved in the photocatalytic degradation reaction system,and the ·OH radical had no significant effect on the chemical reaction.