Enhanced visible-light-driven photocatalytic properties of acceptor dopant Nb5+ modified Bi2WO6 by tailoring the morphology from 3D hierarchical microspheres to 2D nanosheets
Enhanced visible-light-driven photocatalytic properties of acceptor dopant Nb5+ modified Bi2WO6 by tailoring the morphology from 3D hierarchical microspheres to 2D nanosheets
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DOI：
10.1016/j.apsusc.2019.04.065
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发表时间：
2019-08
影响因子：
6.7
通讯作者：
Chaoling Wu;Jian-ming Zhong;Juan Xie;Dan Wang;Yulin Shi;Qiang Chen;Hongjian Yan;Jianguo Zhu
中科院分区：
文献类型：
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作者：
Chaoling Wu;Jian-ming Zhong;Juan Xie;Dan Wang;Yulin Shi;Qiang Chen;Hongjian Yan;Jianguo Zhu
采用水热法合成了Bi 2 W（1−x）NbxO 6 − y可见光催化剂。系统研究了受主掺杂Nb 5+对Bi 2 WO 6（BWO）性能的影响。结果表明，适量的Nb ~（5+）离子可以进入返波管晶格的W位，使返波管的形貌由三维的微球结构向二维的纳米片结构转变。厚度约为7.5 nm的二维纳米片形貌提供了更短的电荷载流子扩散距离，并且由受主掺杂剂Nb 5+产生的氧空位具有分离光生电荷载流子的优势，从而导致增强的光催化性能。x = 0.02的组合物表现出最佳的光催化性能，其可以在60 min内完全降解水溶液中的RhB，表观速率常数k估计为0.0509 min-1，比BWO-SSR（固相反应法制备）样品高约10.2倍，比纯BWO（水热法制备）高约3.9倍。该催化剂具有良好的循环性能，4次循环后，在60 min内可降解水溶液中92%的罗丹明B，是一种很有前景的可见光催化剂。
A novel visible-light-driven photocatalyst with formula of Bi2W(1−x)NbxO6−ywas synthesized by using a facile hydrothermal method. The effects of acceptor dopant Nb5+on the properties of Bi2WO6(BWO) were systematically investigated. Results showed that a moderate amount of acceptor dopant Nb5+ions could enter into the W-sites of BWO lattice and tailor the morphology of BWO from the 3D hierarchical microspheres to 2D nanosheets. The 2D nanosheet morphology with about 7.5 nm in thickness provides shorter diffusion distance of charge carries and the oxygen vacancies produced by the acceptor dopant Nb5+have advantage of separating the photo-induced charge carriers, and thus resulted in enhanced photocatalytic properties. The composition withx= 0.02 showed optimal photocatalytic performance, which could fully degrade RhB in an aqueous solution within 60 min and the apparent rate constant,k, was estimated to be 0.0509 min−1, approximately 10.2 times greater than that of the BWO-SSR (prepared by solid state reaction method) sample and 3.9 times greater than that of the pure BWO (prepared by hydrothermal method). Importantly, this kind of catalyst exhibited good cycling performance, and could degrade 92% of the RhB in an aqueous solution within 60 min after 4 cycles, making it a promising visible-light photocatalyst for the environmental remediation applications.