期刊
CERAMICS INTERNATIONAL
卷 40, 期 8, 页码 11671-11679出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2014.03.176
关键词
Cu-modified Bi2WO6; Microwave-hydrothermal; RhB; Conduction band control; Photocatalytic activity
资金
- National Natural Science Foundation of China [51172135]
- Research and Special Project of the Education Department of Shaanxi Province [12JK0445]
- Graduate Innovation Fund of Shaanxi University of Science and Technology [SUST-A04]
- Green Manufacturing of Ceramic Materials with Novel Functional Application Innovation Team Assistance Fund of Shaanxi University of Science and Technology [TD12-05]
- Academic Leaders Funding Scheme of Shaanxi University of Science Technology [2013XSD06]
- State-Level College Students' Innovation and Entrepreneurship Training Program for Local Colleges and Universities [201310708003]
The Cu-modified Bi2WO6 crystallites have been synthesized by a simple one-step microwave-hydrothermal route. The prepared samples were characterized by an X-ray diffraction technique (XRD), energy-dispersive X-ray analysis, BET surface area analysis, UV-vis diffuse reflectance spectrum (DRS), field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL). Visible-light-driven photodegradation of rhodamine B (RhB) was carried out to evaluate the photocatalytic activity of the products. The results indicated that the addition of proper Cu ions could evidently improve the activity of pure Bi2WO6. On the basis of experimental result and band structure analysis, an enhanced photocatalytic mechanism is proposed; namely, Cu ions possibly reduce oxygen via a multi-electron transfer mechanism and the formation of oxygen vacancies facilitates the reduction of O-2 by the trapped electrons to generate superoxide radicals. These two aspects play key roles in the photodegradation of RhB. This study provides a research foundation to photocatalytic mechanism of metal-modified new composite photocatalyst. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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