Plasmonic Bi Metal Deposition and g-C3N4 Coating on Bi2WO6 Microspheres for Efficient Visible-Light Photocatalysis

详细信息    查看全文

• 作者：Jiajia Wang ; Lin TangGuangming Zeng ; Yani Liu ; Yaoyu Zhou ; Yaocheng Deng ; Jingjing Wang ; Bo Peng
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2017
• 出版时间：January 3, 2017
• 年：2017
• 卷：5
• 期：1
• 页码：1062-1072
• 全文大小：789K
• ISSN：2168-0485

文摘

A low-cost semiconductor-based photocatalyst using visible light energy has attracted increasing interest for energy generation and environmental remediation. Herein, plasmonic Bi metal was deposited in situ in g-C₃N₄@Bi₂WO₆ microspheres via a hydrothermal method. As an electron-conduction bridge, metallic Bi was inserted as the interlayer between g-C₃N₄ and the surface of Bi₂WO₆ microspheres to enhance visible light absorption due to the surface plasmon resonance (SPR) effect and facilitate efficient electron-carrier separation. Different characterization techniques, including XRD, SEM, TEM, UV–vis, XPS, photoluminescence, and photocurrent generation, were employed to investigate the morphology and optical properties of the as-prepared samples. The results indicated that the g-C₃N₄(20%)@Bi@Bi₂WO₆ microsphere sample exhibited an extraordinary enhanced photocatalytic activity, higher than those of the g-C₃N₄, Bi₂WO₆, and g-C₃N₄(20%)@Bi₂WO₆ samples. It implies that the heterostructured combination of g-C₃N₄, metallic Bi, and Bi₂WO₆ microspheres provided synergistic photocatalytic activity via an efficient electron transfer process. On the basis of the results, a possible photocatalytic mechanism of the as-prepared samples was proposed. The present study demonstrated the feasibility of utilizing low-cost metallic Bi as a substitute for noble metals to design a doped photocatalysis composite with enhanced photocatalytic performance.