Synthesis of novel visible light responding vanadate/TiO₂ heterostructure photocatalysts for application of organic pollutants

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• 作者：YuLin Min^a ;   ; ^b ;   ; ^c ; Kan Zhang^c ;   ; ^d ;   ; ^{zhangkan112255@hotmail.com} ; YouCun Chen^a ;   ; ^b ; YuanGuang Zhang^a ;   ; ^b
• 关键词：Vanadate/TiO₂ heterostructure photocatalysts ; Photocatalytic properties ; Organic dye ; Charge transfer
• 刊名：Chemical Engineering Journal
• 出版年：2011
• 出版时间：15 November 2011
• 年：2011
• 卷：175
• 期：Complete
• 页码：76-83
• 全文大小：1893 K

文摘

A series of vanadate grafted TiO₂ heterostructure photocatalyst were synthesized to enhance the visible light activity of TiO₂ using a rapid and efficient ion impregnate method with simultaneous formation of vanadate combined with TiO₂. Grafted vanadate with narrow band gap can absorb light at significantly lower energies in the visible range (>500 nm), resulting in charge transfer to TiO₂, hence improving the visible light response of TiO₂. Moreover, the BiVO₄ grafted TiO₂ heterostructure photocatalysts revealed highest visible light response for degradation of non-sensitized dye due to especial atom orbit energy of BiVO₄, facilitating charge transfer from BiVO₄ to TiO₂ at the interface. However, the InVO₄/TiO₂ had best photocatalytic performance for photosensitized dye due to the gradient charge transfer for minimizing the energy-wasteful electron¨Chole recombination. The synthesis of vanadate grafted TiO₂ heterostructure photocatalysts described here electron/hole transfer in junction interface of vanadate and TiO₂, leading to sensitization of TiO₂ for absorption in the visible region and provide a systematic study for controlling and understanding the energy levels of conduction band and valence band relevant to charge-transfer phenomena for the photocatalytic and optoelectronic properties of TiO₂.