Preparation,Characterization And Catalytic Properties Study Of Lamellar Tetraitanate Potassium Composites

In the recent few years,the global environmental problems have attracted much attention with the theme of sustainable development.The semiconductor oxide,as catalysts in heterogeneous photocatalytic reactions has become an ideal technology for pollution abatement with the advantages of mild reaction conditions,depth of mineralization and purification,as well as the direct usage of clean and green sunlight.Furthermore,K₂Ti₄O₉ has been considered as one of the most promising nanocomposite in catalysis and widely used in photocatalysis because of its unique layered structure,swelling layer board property and easy ion exchange between the layers.Finally,in this article,we have designed and synthesized a series of composites,such as graphene supporting,semiconductor composites coupling and so on.In addition,we evaluated rheir photocatalytic performances under the visible light irradiation.?1?Preparation and photocatalytic performance study of N-K₂Ti₄O₉/G composites.The N-K₂Ti₄O₉/G was synthesized by calcination in air using and then hydrothermal treatment using urea as N source and graphene as support material.The results show that N-K1Ti4U9/G composites displayed a dramatic performance for degradation of MB and RhB under the visible light irradiation.The significant enhancement in photoactivity can be ascribed to doping nitrogen and introducing the graphene.?2?Preparation and photocatalytic performance study of Ag3PO₄-TiO₂/K₂Ti₄O₉ composites.The TiO₂/K₂Ti₄O₉ photocatalyst was prepared by facile calcination and precipitation method and characterized by XRD,XPS,FT-IR,TEM and other ways.The results show that K₂Ti₄O₉ nanosheets were decorated with TiO₂ and Ag3PO₄ nanoparticles with average diameter of 20 nm and 3nm respectively.When the ratio of AgNO₃ and TiO₂/K₂Ti₄O₉ was 2:1,the Ag3PO₄-TiO₂/K₂Ti₄O₉ composites showed excellent photocatalytic performance for degradation of MB,RhB and MO under visible light irradiation.?3?Preparation and photocatalytic performance study of Ag₃PO₄/H₂Ti₄O₉.First,the layered H₂Ti₄O₉ nanosheets were exfoliated in tetrabutylammonium hydroxide?TBAOH?and then Ag3PO₄ nanoparticles were precipited on the surface of H₂Ti₄O₉ nanosheets.The XRD,XPS,FT-IR,TEM were employed to characterize the structure and morphology of Ag₃PO₄/H₂Ti₄O₉.The experimental results show that the Ag₃PO₄/H₂Ti₄O₉ composites gave excellent photocatalytic performance for degradation of MB and RhB under the visible light irradiation due to large specific surface and the remarkable synergistic effect between small size Ag₃PO₄ and H₂Ti₄O₉ nanosheets.