Two-Dimensional CaIn2S4/g-C3N4 Heterojunction Nanocomposite with Enhanced Visible-Light Photocatalytic Activities: Interfacial Engineering and Mechanism Ins

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• 作者：Deli Jiang ; Jie Li ; Chaosheng Xing ; Zhengyuan Zhang ; Suci Meng ; Min Chen
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 2, 2015
• 年：2015
• 卷：7
• 期：34
• 页码：19234-19242
• 全文大小：570K
• ISSN：1944-8252

文摘

Design and exploitation of efficient visible light photocatalytic systems for water splitting and degradation of organic dyes are of huge interest in the fields of energy conversion and environmental protection. Herein, two-dimensional CaIn₂S₄/g-C₃N₄ heterojunction nanocomposites with intimate interfacial contact have been synthesized by a facile two-step method. Compared with pristine g-C₃N₄ and CaIn₂S₄, the CaIn₂S₄/g-C₃N₄ heterojunction nanocomposites exhibited significantly enhanced H₂ evolution and photocatalytic degradation of methyl orange (MO) activities under visible light irradiation. The optimal CaIn₂S₄/g-C₃N₄ nanocomposite shows a H₂ evolution rate of 102 渭mol g^鈥? h^鈥?, which is more than 3 times that of pristine CaIn₂S₄. The mechanisms for improving the photocatalytic performance of the CaIn₂S₄/g-C₃N₄ nanocomposites were proposed by using the photoluminescence measurement and electrochemical analyses. It was demonstrated that the enhanced photocatalytic performance of CaIn₂S₄/g-C₃N₄ heterojunction nanocomposites mainly stems from the enhanced charge separation efficiency. In addition, a plausible mechanism for the degradation of MO dye over CaIn₂S₄/g-C₃N₄ nanocomposites is also elucidated using active species scavenger鈥檚 studies.