Study On The Photocatalytic Activity Of BaTiO₃/TiO₂/C Composites

TiO₂ is an advanced functional materials,which has many advantage,such as non-toxic,no secondary pollution,stable structure,strong photocatalytic activity,high working voltage,and inexpensive.It is a hot material in the field of electrochemistry and photocatalysis.However,TiO₂ still mainly suffers from some problems,including low conductivity,narrow spectral absorption range,high photoelectric-hole compound rate,and so on.The combination of TiO₂ and BaTiO₃ semiconductor materials with high dielectric constant and magnetic properties not only can separate light raw carrier current through the internal dipole field of BaTiO₃,but also can form heterostructure to restrain effectively the composite of electronic-hole.The carbon with high conductivity is doped into TiO₂ to reduce the forbidden band width of TiO₂,and then help to improve the photocatalytic performance of the material.BaTiO₃/TiO₂/C composite have been synthesized by ice template method using BaTiO₃ as the core and titanium,sucrose,barium titanate as raw materials in this paper.This work studies the structure and morphology of the material and the photocatalytic properties of the BaTO₃/TiO₂/C composites for methylene blue degradation.The calcination temperature and the preparation method have been optimized according to the photocatalytic performance in the range of 700-900℃.The results showed that the photocatalytic activity of BaTiO₃/TiO₂/C prepared by using sucrose as the carbon source and calcining for 5 h at 900℃ is optimal.The particle size of BaTi03 has an influence on the photocatalytic performance of composite materials,and the BaTiO₃/TiO₂/C composite materials prepared with 1μm BaTiO₃ have the best catalytic activity of methylene blue.In this paper,the degradation effect of BaTiO₃/TiO₂/C prepared by mechanical mixing and BaTiO₃/TiO₂/Cwas core-shell structure for methylene blue degradation was compared.