Controllable synthesis and enhanced visible photocatalytic degradation performances of Bi2WO6–carbon nanofibers heteroarchitectures
Controllable synthesis and enhanced visible photocatalytic degradation performances of Bi2WO6–carbon nanofibers heteroarchitectures
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DOI：
10.1007/s10971-014-3284-x
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发表时间：
2014-01
影响因子：
2.5
通讯作者：
Yueting Zhang;C. Shao;Xinghua Li;Na Lu;Mingyi Zhang;Peng Zhang;Xin Zhang;Yichun Liu
中科院分区：
文献类型：
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作者：
Yueting Zhang;C. Shao;Xinghua Li;Na Lu;Mingyi Zhang;Peng Zhang;Xin Zhang;Yichun Liu
采用静电纺丝法制备了Bi 2 WO 6-碳纳米纤维（Bi 2 WO 6-CNFs），并通过乙二醇溶剂热法在CNFs上生长了Bi 2 WO 6纳米纤维。结果表明，在溶剂热法制备Bi 2 WO 6-CNFs异质结构的过程中，可以通过调节前驱体浓度来控制Bi 2 WO 6在CNFs表面的负载量。光催化性能测试结果表明，与溶剂热法合成的纯Bi 2 WO 6相比，Bi 2 WO 6-CNFs异质结构在可见光下对罗丹明B具有更好的光催化降解性能，这是由于光生电子和空穴的分离效率得到了提高。此外，Bi 2 WO 6-CNFs异质结构由于其一维纳米结构的特性，可以容易地通过沉降分离。同时，由于Bi 2 WO 6纳米片与CNFs之间存在较强的相互作用，Bi 2 WO 6-CNFs异质结构的光催化活性在回收过程中保持稳定。捕集实验表明，Bi 2 WO-CNFs异质结构光催化过程中的主要活性物种是OH·，而不是OH·.
Bi2WO6–carbon nanofibers (Bi2WO6–CNFs) heteroarchitectures were fabricated by two steps consisting of the preparation of CNFs by electrospinning and growth of Bi2WO6on the CNFs through ethylene glycol solvothermal processing. The results showed that the loading amounts of Bi2WO6on the surface of CNFs could be controlled by adjusting the precursor concentration for the fabrication of Bi2WO6–CNFs heteroarchitectures during the solvothermal process. The photocatalytic tests revealed that the obtained Bi2WO6–CNFs heteroarchitectures showed higher photocatalytic property under visible light to degrade Rhodamine B than pure Bi2WO6synthesized by solvothermal process in the absence of CNFs owing to improved separation efficiency of photogenerated electrons and holes. Moreover, the Bi2WO6–CNFs heteroarchitectures could be separated easily by sedimentation due to their one-dimensional nanostructural property. Meanwhile, the photocatalytic activity of Bi2WO6–CNFs heteroarchitectures was stable during the recycling due to the strong interactions between Bi2WO6nanosheets and CNFs. Trapping experiment suggested that, instead of OH·, was the main active species during the photocatalytic process of the Bi2WO–CNFs heteroarchitectures.