Novel visible light-induced g-C₃N₄/Bi₂WO₆ composite photocatalysts for efficient degradation of methyl orange

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• 作者：Lei  ; Ge  ; ;   ; ^{gelei08@sina.com} ; Changcun  ; Han ; Jing  ; Liu
• 关键词：g-C₃N₄ ; Bi₂WO₆ ; Photocatalysis ; Functional ; Semiconductors
• 刊名：Applied Catalysis B: Environmental
• 出版年：2011
• 出版时间：2011
• 年：2011
• 卷：108-109
• 期：Complete
• 页码：100-107
• 全文大小：1610 K

文摘

Novel visible light-induced g-C₃N₄/Bi₂WO₆ composite photocatalysts were synthesized by introducing polymeric g-C₃N₄. The obtained g-C₃N₄/Bi₂WO₆ products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, ultraviolet¨Cvisible diffuse reflection spectroscopy (DRS), and photoluminescence spectroscopy. The DRS results revealed that the g-C₃N₄/Bi₂WO₆ samples had a red shift and strong absorption in the visible light region. The photocatalytic oxidation ability of the novel photocatalyst was evaluated using methyl orange as a target pollutant. The photocatalysts exhibited a significantly enhanced photocatalytic performance in degrading methyl orange. The optimal g-C₃N₄ content for the photocatalytic activity of the heterojunction structures was determined. The synergic effect between g-C₃N₄ and Bi₂WO₆ was found to lead to an improved photo-generated carrier separation. Consequently, the photocatalytic performance of the g-C₃N₄/Bi₂WO₆ composites under visible light irradiation (¦Ë > 420 nm) was enhanced. The possible photocatalytic mechanism of the composites was proposed to guide the further improvement of their photocatalytic activity.