Abstract Designing and developing an efficient photocatalytic system for degrading organic pollutants was a research hotspot in the field of environmental governance. In this study, a novel Bi2WO6/In(OH)3 composite photocatalyst was first fabricated via facile calcination-hydrothermal synthesis method. The 9-Bi2WO6/In(OH)3 composite had superior photocatalytic performance for degrading the 2-Mercaptobenzothiazole (MBT) under visible-light irradiation. The degradation rate constant of 9-Bi2WO6/In(OH)3 was 0.02192 min−1, which was 2.3 times than that of pure Bi2WO6 (0.00948 min−1). The improvement in photocatalytic performance was due to the synergistic effect of the surface heterojunction and the electron-transfer medium. The density functional theory (DFT) showed that the difference in energy levels between the conduction bands and valence bands of Bi2WO6 nanocubes (010) and (001) could build the surface heterojunction, which was in favor to promote the electron-hole pairs separation. And the In(OH)3 not only acted as a supporter to prevent the agglomeration of small size Bi2WO6 nanocubes, but also served as electron-transfer mediator to inhibit the recombination of electrons and holes. This study provided a reference value for the development and utilization of Bi-based photocatalysts. Considering the properties and structural characteristics of Bi-based photocatalysts and hydroxides, Bi2WO6/In(OH)3 composite photocatalysts were design reasonably, which provided a variety of the types of photocatalysts.

中文翻译：

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新型 Bi2WO6 纳米立方体/In(OH)3 光催化剂光催化降解 2-巯基苯并噻唑：合成过程、降解途径和增强的光催化性能机理研究

摘要 设计开发一种高效光催化降解有机污染物的体系是环境治理领域的研究热点。在这项研究中，首先通过简便的煅烧-水热合成方法制备了一种新型的 Bi2WO6/In(OH)3 复合光催化剂。9-Bi2WO6/In(OH)3 复合材料在可见光照射下具有优异的光催化降解 2-巯基苯并噻唑 (MBT) 的性能。9-Bi2WO6/In(OH)3 的降解速率常数为0.02192 min-1，是纯Bi2WO6 (0.00948 min-1) 的2.3 倍。光催化性能的提高是由于表面异质结和电子转移介质的协同作用。密度泛函理论（DFT）表明，Bi2WO6纳米立方体（010）和（001）的导带和价带之间的能级差异可以构建表面异质结，有利于促进电子-空穴对的分离。In(OH)3不仅作为支撑体防止小尺寸Bi2WO6纳米立方体的团聚，而且作为电子转移介质抑制电子和空穴的复合。该研究为铋基光催化剂的开发利用提供了参考价值。综合考虑Bi基光催化剂和氢氧化物的性质和结构特点，合理设计了Bi2WO6/In(OH)3复合光催化剂，提供了多种类型的光催化剂。