Visible Light-Induced Efficient Contaminant Removal by Bi5O7I

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• 作者：Songmei Sun ; Wenzhong Wang* ; Ling Zhang ; Lin Zhou ; Wenzong Yin ; Meng Shang
• 刊名：Environmental Science & Technology
• 出版年：2009
• 出版时间：March 15, 2009
• 年：2009
• 卷：43
• 期：6
• 页码：2005-2010
• 全文大小：252K
• 年卷期：v.43,no.6(March 15, 2009)
• ISSN：1520-5851

文摘

A new visible light-driven photocatalyst, Bi₅O₇I, prepared by a hydrothermal method was studied. The as-prepared Bi₅O₇I exhibited efficient photocatalytic activity in the decomposition of a widely used dye, tetraethylated rhodamine (RhB), in water and acetaldehyde (CH₃CHO) in air under visible light irradiation. Besides decoloring, the reduction of chemical oxygen demand concentration was also observed in the degradation of RhB, further demonstrating the photocatalytic performance of Bi₅O₇I. The results of density functional theory calculations indicated that the conduction band bottom of Bi₅O₇I is mainly composed of Bi 6p orbits, and the valence band top primarily consists of I 5p and O 2p orbits. The as-prepared Bi₅O₇I exhibited much higher photocatalytic activity than Bi₂O₃, which may be ascribed to the hybrid states of the valence bands as well as the internal electric fields between Bi₅O₇ and I slabs. According to experimental results, a possible photocatalytic mechanism of Bi₅O₇I was proposed.