Bi_2Mo_xW_(1-x)O_6 solid solutions with tunable band structure and enhanced visible-light photocatalytic activities

Li Wenqi; Ding Xingeng; Wu Huating; Yang Hui

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Bi_2Mo_xW_(1-x)O_6 solid solutions with tunable band structure and enhanced visible-light photocatalytic activities

机译：具有可调带结构和增强的可见光光催化活性的Bi_2Mo_xW_（1-x）O_6固溶体

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Semiconductor photocatalysis is an effective green way to combat water pollution. For the first time, this study reports a novel method to develop Bi2MoxW1-xO6 solid solution with microsphere structure through anion-exchange method. All Bi2MoxW1-xO6 samples exhibit an Aurivillius-type crystal structure without any secondary phase, confirming that in complete solid solutions as the value of x increases, the band gap energy of Bi2MoxW1-xO6 solid solutions decreases, while the optical absorption edge moves to longer wavelength. The Raman spectra research shows an increase in orthorhombic distortion with progressive replacement of W sites in Bi2WO6 with Mo6+ ions. Compared to Bi2MoO6 and Bi2WO6 samples, Bi2Mo0.4W0.6O6 sample displayed best photocatalytic activity and cycling stability for degradation of RhB dye. The enhanced photocatalytic activity of Bi2Mo0.4W0.6O6 sample can be synergetically linked to hierarchical hollow structure, enhanced light absorbance, and high carrier-separation efficiency. Additionally, the hollow Bi2MoxW1-xO6 microspheres formation can be attributed to the Kirkendall effect. (C) 2018 Elsevier B.V. All rights reserved.

机译：半导体光催化是对抗水污染的有效绿色方法。这项研究首次报道了一种通过阴离子交换方法开发具有微球结构的Bi2MoxW1-xO6固溶体的新方法。所有Bi2MoxW1-xO6样品均表现出Aurivillius型晶体结构，没有任何次级相，这证实了在完全固溶体中，随着x值的增加，Bi2MoxW1-xO6固溶体的带隙能量会减小，而光吸收边缘会变长。波长。拉曼光谱研究表明，随着Mo6 +离子逐步取代Bi2WO6中的W位，正交晶形畸变增加。与Bi2MoO6和Bi2WO6样品相比，Bi2Mo0.4W0.6O6样品对RhB染料的降解表现出最佳的光催化活性和循环稳定性。 Bi2Mo0.4W0.6O6样品增强的光催化活性可以协同作用与分层空心结构，增强的光吸收率和高的载流子分离效率相联系。此外，中空的Bi2MoxW1-xO6微球形成可归因于Kirkendall效应。（C）2018 Elsevier B.V.保留所有权利。

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来源
《Applied Surface Science》 |2018年第31期|636-647|共12页
作者
Li Wenqi; Ding Xingeng; Wu Huating; Yang Hui;
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作者单位

Zhejiang Univ, Sch Mat Sci & Engn, Hangzhou 310027, Zhejiang, Peoples R China;

Zhejiang Univ, Sch Mat Sci & Engn, Hangzhou 310027, Zhejiang, Peoples R China;

Zhejiang Univ, Sch Mat Sci & Engn, Hangzhou 310027, Zhejiang, Peoples R China;

Zhejiang Univ, Sch Mat Sci & Engn, Hangzhou 310027, Zhejiang, Peoples R China;

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正文语种 eng
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关键词
Bi2MoxW1-xO6 solid solutions; Hollow structure; Defects; Photocatalysis;

机译：Bi2MoxW1-xO6固溶体;空心结构;缺陷;光催化;

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Bi_2Mo_xW_(1-x)O_6 solid solutions with tunable band structure and enhanced visible-light photocatalytic activities

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