Enhanced photocatalytic performance in Bi₂WO₆/SnS heterostructures: Facile synthesis, influencing factors and mechanism of the photocatalytic process

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• 作者：Rongfeng Tang ; Huaifen Su ; Yuanwei Sun ; Xianxi Zhang ; Lei Li ; Caihua Liu ; Suyuan Zeng ; ^{drzengsy@163.com" class="auth_mail" title="E-mail the corresponding author} ; Dezhi Sun ; ^{sundezhi@lcu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Narrow band semiconductor coupling ; Bi2WO6/SnS heterostructures ; Visible-light-driven photocatalysis ; pH-dependent
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：15 March 2016
• 年：2016
• 卷：466
• 期：Complete
• 页码：388-399
• 全文大小：3383 K

文摘

Highly-efficient photocatalyst based on Bi₂WO₆/SnS heterostructure was prepared via a surface functionalization method using 3-mercaptopropionic (MPA) as the surface functionalizing agent. Compared to bare Bi₂WO₆ and SnS nanoparticles, the as-formed Bi₂WO₆/SnS heterostructure exhibits enhanced photocatalytic activity for the degradation of Rhodamine B (Rh B). Photoluminescence and photocurrent measurements demonstrate that the enhanced photocatalytic activity during the photocatalytic process is closely related to the enhanced electron–hole separation efficiency. The photocatalytic activity of the as-formed Bi₂WO₆/SnS heterostructure can be perfectly remained even after being used for five times, showing excellent durability during the photocatalytic process. The influence of pH and inorganic ions are systematically investigated. And the optimum pH for the photocatalytic process is determined to be 6. The addition of chloride ion will exert negative effect on the photodegradation process of Rh B. The mechanism of photodegradation process was investigated by exploring the quenching effects of different scavengers and the results suggest that the reactive holes play the major role in the photodegradation process of Rh B.