Preparation And Photocatalytic Degradation Of TiO₂ Composites

Environmental pollution,especially water pollution,has become a common concern all over the world.The potential of semiconductor photocatalytic materials in the treatment of environmental pollution makes the preparation and modification of semiconductor photocatalytic materials become the focus of researchers.TiO₂ semiconductor material has the advantages of stable chemical properties,non-toxicity,no photocorrosion under light,excellent acid and alkaline resistance,abundant sources and cheap price,etc.which is very necessary for research.It has been of great significance to study the doping modification of pure TiO₂,the adjustment of crystal and morphology,and the construction of semiconductor heterojunction.The specific research content is as follows:（1）Using tetra-n-butyl titanate as precursor,the binary composites Ag₃PO₄-WO₃,WO₃-TiO₂ and Ag₃PO₄-TiO₂ were prepared by sol-gel method and hydrothermal method,and the ternary composites Ag₃PO₄-WO₃-TiO₂ was prepared by hydrothermal method,and characterized by SEM、XRD、FT-IR、BET and other characterization methods.The photocatalytic degradation performance of rhodamine B was compared with that of rhodamine B under ultraviolet light.The effects of optimal preparation conditions,pH and catalytic cycle times on the degradation performance of WO₃ and Ag₃PO₄were also investigated.（2）In order to further improve the photocatalytic activity,the structure of the mesoporous TiO₂-mesoporous carbon ball for the modification of compound semiconductor WO₃,liquid glucose solution as the precursor,preparation of carbon spheres,with carbon spheres as template,four are butyl titanate（TBOT）as the source of titanium,tungsten source of ammonium tungstate,using solvent hot method,preparation of the WO₃ is about 310 nm in diameter/mesoporous TiO₂-mesoporous carbon composite spheres,using SEM、XRD、FT-IR、BET etc.Characterization methods were characterized.Rhodamine B was used as the degradation target pollutant to investigate the effects of different WO₃ compounds on photocatalytic activity under ultraviolet light.（3）In situ precipitation method,mesoporous TiO₂-mesoporous carbon ball particles were covered on the surface of Ag₃PO₄ particles,forming a new core-shell structure composite material.XRD、SEM、FT-IR、BET and other methods were used to characterize mesoporous carbon spheres/Ag₃PO₄ photocatalysts with different mole ratios.Under visible light,the photocatalytic degradation of rhodamine B was studied.