Hierarchical Nanostructured 3D Flowerlike BiOClxBr1鈥?i>x Semiconductors with Exceptional Visible Light Photocatalytic Activity

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• 作者：Hani Gnayem ; Yoel Sasson
• 刊名：ACS Catalysis
• 出版年：2013
• 出版时间：February 1, 2013
• 年：2013
• 卷：3
• 期：2
• 页码：186-191
• 全文大小：315K
• 年卷期：v.3,no.2(February 1, 2013)
• ISSN：2155-5435

文摘

With careful rational optimization and substantial simplification of the syntheses of the recently reported alloys BiO(Cl_xBr_1鈥?i>x), we fabricated, via a very simple procedure and at room temperature, a unique visible-light-driven photocatalyst with excellent activity. The alloy BiOCl_0.875Br_0.125 totally decomposed 15 mg/L aqueous Rhodamine B solution within 120 s upon irradiation with visible light (位 > 422 nm). The transparent substrate acetophenone was also swiftly destroyed under the above conditions. The catalyst maintained partial activity even after switching off the light source. Initial mechanistic studies clearly suggest that the mode of action of these materials is fundamentally different from previously reported photocatalytic mechanisms. Evidently, the putative molecular mechanism does not engage dye photosensitization or oxygen radicals.

Keywords:

bismuth mixed oxyhalides; visible light photocatalyst; Rhodamine B decomposition; acetophenone decomposition