Abstract In this paper, novel two dimensional (2D) Bi 2 MoO 6 @Ag 2 MoO 4 core-shell composites have been successfully prepared by two-step hydrothermal and in-situ generating process. The sheet-structured composites can not only shorten the distance between the charge carriers and active sites, but provide more active sites for photocatalytic performance. Coated Ag 2 MoO 4 nanoparticles on the surface of Bi 2 MoO 6 nanosheets at room temperature has been verified to be an effective approach to prepare 2D core-shell composites, which benefits the formation of large-area heterojunction and boosts the separation of charge carriers. Bi 2 MoO 6 @Ag 2 MoO 4 composites show excellent visible light photocatalytic performance and high stability. The apparent pseudo-first-order rate constant k app for Bi 2 MoO 6 @Ag 2 MoO 4 2:1 is 0.07255 min −1 , which is 7.2 and 10.4 times higher than that of Bi 2 MoO 6 (0.01010 min −1 ) and Ag 2 MoO 4 (0.00698 min −1 ), respectively. Furthermore, by trapping experiment for reactive species, we demonstrate that holes play a vital role in the process of photocatalytic degradation. Eventually, a reasonable photocatalytic mechanism is proposed.

中文翻译：

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具有增强的可见光光催化活性的二维Bi 2 MoO 6 @Ag 2 MoO 4 核壳复合材料的简便制备

摘要 本文通过两步水热原位生成工艺成功制备了新型二维(2D) Bi 2 MoO 6 @Ag 2 MoO 4 核壳复合材料。片状结构的复合材料不仅可以缩短电荷载流子与活性位点之间的距离，而且可以为光催化性能提供更多的活性位点。室温下在Bi 2 MoO 6 纳米片表面涂覆Ag 2 MoO 4 纳米颗粒已被证实是制备二维核壳复合材料的有效方法，有利于大面积异质结的形成并促进电荷载流子的分离. Bi 2 MoO 6 @Ag 2 MoO 4 复合材料显示出优异的可见光光催化性能和高稳定性。Bi 2 MoO 6 @Ag 2 MoO 4 2:1 的表观伪一级速率常数 k app 为 0.07255 min -1 ，分别是Bi 2 MoO 6 (0.01010 min -1 )和Ag 2 MoO 4 (0.00698 min -1 )的7.2倍和10.4倍。此外，通过对活性物种的捕获实验，我们证明了空穴在光催化降解过程中起着至关重要的作用。最终提出了合理的光催化机理。