The Study Of Preparation Characterization And Photocatalytic Performance Of Nano-TiO₂and SnO₂/TiO₂（Hollow）Compound Nanomaterials

TiO2is one of the most promising environmental friendly photocatalyst. It has been widely used in sensor, photonic crystal and degradation of organic due to its chemical stability and thermal stability. Recently, the mainly attention of the study is focused on expanding the range of light absorption and reducing the recombine rate of hole and electronic. The modification of TiO2with other semiconductor whose energy level matches with TiO2, such as SnO2/TiO2In this paper, different morphology of nano-TiO2has been prepared by different dispersants-assistance hydrothermal crystallization method. The microstructurs were characterized by XRD, SEM and TEM. The microstructural and surface physical properties of SnO2/TiO2(hollow) composite photocatalys prepared by same method were characterized by XRD, SEM, TEM, TG/DTA, IR and BET. The photocatalytic activity of SnO2/TiO2(hollow) prepared with different mol ratio of Ti/Sn was measured by the photocatalytic oxidation of toluene, and compared with pure-TiO2and commercial P25.The surface smooth, uniform dispersity of spherical TiO2particles were synthesized by0.576g PVP as the dispersant and reacted at150℃for4hours.The CTAB was used as the dispersant for synthesis nano TiO2with optimum morphology and dispersity. The smooth spherical TiO2particles with hollow structured was prepared by9mg/ml CTAB, reacting at150℃for4hours. Moreover, nano TiO2particles with hollow structure almostly prepared by adjusted the ratio of ncTAB/nTi4+(ncTAB/nTi4+at0.25).Uniform dispersity of hollow TiO2spherical particles was synthesized by adjusted the ratio of PVP and CTAB, and the optimal proportion of mpvp/mcTAB was1/5.Dispersive of hollow SnO2/TiO2composite photocatalyst was prepared by hydrothermal crystallization method and hydrothermal reaction for12h. It can be seen that rutile SnO2diffraction peaks in the XRD patterns of TiO2/SnO2composite photocatalysts and corresponding planes of rutile SnO2recorded by TEM when the ratio of nTi/nSn were4/1 and2/1. It indicates SnO2has been crystallized on the surface of hollow TiO2sphere and the specific surface area of the sample showed highest (165.4m2/g).The SnO2/TiO2composite catalyst with the best photocatalytic activity was prepared when the ratio of nTi/nSn was4and the degradation rate of toluene was69.1%, with84.3and35.2percentage respectively higer than Degussa P25and TiO2respectively. And the degradation rate of toluene increased by74%after400℃calcinations.