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Enhanced photocatalytic activity of BiOI under visible light irradiation by the modification of MoS2

机译：MoS 2 的修饰增强BiOI在可见光下的光催化活性

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摘要

3D hierarchical BiOI nanostructures modified with MoS2 were successfully fabricated through a simple solvent thermal process. The prepared heterostructured BiOI–MoS2 nanocomposite exhibited excellent photocatalytic performance in the degradation of methyl orange under visible light irradiation. The photocatalytic activity of BiOI–MoS2 increases with the increase of MoS2 content first, then it decreases when MoS2 content is over 0.5 wt%. The degradation efficiency of methyl orange could achieve 95% within 90 min in the presence of BiOI–0.5 wt% MoS2, which is about two times higher than that of pristine BiOI nanostructures. The obviously improved photocatalytic performance of BiOI–MoS2 could be mainly attributed to the significantly enhanced separation efficiency of photogenerated charge carriers. However, too much MoS2 loading on the surface of BiOI will prevent light from reaching surface of BiOI and limit the efficiency of charge separation. Based on active species trapping experiments, holes (h+) were proved to be the main reactive species in the prepared BiOI–MoS2 system.
机译：MoS 2 修饰的3D分层BiOI纳米结构是通过简单的溶剂热工艺成功制备的。制备的异结构BiOI-MoS 2 纳米复合材料在可见光照射下对甲基橙的降解表现出优异的光催化性能。随着MoS 2 含量的增加，BiOI–MoS 2 的光催化活性先增加，然后在MoS 2 的含量增加时降低。 MoS 2 含量超过0.5 wt％。在存在BiOI–0.5 wt％MoS 2 的情况下，甲基橙的降解效率在90分钟内可达到95％，约为原始BiOI的两倍。纳米结构。 BiOI–MoS 2 的光催化性能明显提高，主要归因于光生载流子的分离效率大大提高。但是，BiOI表面的MoS 2 负载过多会阻止光到达BiOI表面，从而限制了电荷分离的效率。通过活性物种捕获实验，证明空穴（h + ）是制备的BiOI-MoS 2 系统。

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