Construction of AgCl/Ag/BiOCl with a concave-rhombicuboctahedron core–shell hierarchitecture and enhanced photocatalytic activity
Construction of AgCl/Ag/BiOCl with a concave-rhombicuboctahedron core–shell hierarchitecture and enhanced photocatalytic activity
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DOI：
10.1039/c6ra14170f
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发表时间：
2016-09
期刊：
影响因子：
3.9
通讯作者：
Zhi-Kun Xu;Shuangyan Lin
中科院分区：
文献类型：
--
作者：
Zhi-Kun Xu;Shuangyan Lin
AgCl/Ag/BiOCl具有良好的光催化活性，具有凹-菱形六面体结构。在可见光照射下，AgCl/Ag/BiOCl表现出明显高于纯Ag/AgCl和BiOCl的光催化活性，其中主要活性物质为空穴和Cl原子。提出了增强可见光催化活性的可能的电荷转移机理。水蒸气扩散过程的缓慢反应速率可以产生以立方AgCl为核心，表面为BiOCl纳米片的AgCl/Ag/BiOCl层次化结构。AgCl与BiOCl之间的异质结可以有效地促进界面电荷转移，减少光致电子与空穴的结合，从而产生大量空穴，增强光催化活性。此外，BiOCl纳米片在AgCl/Ag/BiOCl表面的强吸附活性也促进了其光催化活性。最后，AgCl/Ag/BiOCl异质结光催化剂实现了低银消耗和高光催化效率。这种新型光催化剂在消除有机污染物方面具有潜在的应用前景，为设计高效的异质结光催化剂提供了新的思路。
AgCl/Ag/BiOCl with a concave-rhombicuboctahedron hierarchitecture with excellent photocatalytic activity is obtained via a facile vapor diffusion strategy at room temperature without template or any additives. The AgCl/Ag/BiOCl shows considerably higher photocatalytic activity than pure Ag/AgCl and BiOCl under visible light irradiation, in which the main active species are holes and Cl atoms. The possible charge transfer mechanism for the enhanced visible light photocatalytic activity is proposed. The slow reaction rate of the vapor diffusion process could produce the hierarchical structure AgCl/Ag/BiOCl which consists of cubic AgCl as the core and BiOCl nanosheets on the surface. The heterojunction between AgCl and BiOCl could effectively promote the interfacial charge transfer and decrease the combination of photoinduced electrons and holes, thus produce a large number of holes and enhance photocatalytic activity. Furthermore, strong adsorption activity of BiOCl nanosheets on the surface of AgCl/Ag/BiOCl also promotes the photocatalytic activity. Finally, low consumption of Ag and higher photocatalytic efficiency are both achieved in the AgCl/Ag/BiOCl heterojunction photocatalyst. This novel photocatalyst demonstrates potential application for organic pollutant elimination and proposes insight for designing highly efficient heterojunction photocatalysts.