Journal
CATALYSIS TODAY
Volume 278, Issue -, Pages 280-290Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2015.12.028
Keywords
CeO2/Bi2WO6; Composite; Doctor blading; Film; Photocatalytic activity
Funding
- Thailand Graduate Institute of Science and Technology Development Agency (TGIST)
- National Science and Technology Development Agency (NSTDA)
- Thailand Research Fund (TRF)
- National Research University (NRU) Project under the Office of the Higher Education Commission (CHE), Ministry of Education, Thailand
- Materials Science Research Center, Faculty of Science, Chiang Mai University
- Department of Physics and Materials Science, Faculty of Science, Chiang Mai University
- Graduate School, Chiang Mai University
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The CeO2, Bi2WO6 and 0.4CeO(2)/0.6Bi(2)WO(6) photocatalyst films were fabricated by a doctor blading method. The film thickness of the as-prepared samples was varied to one, two and three layers. The physicochemical properties of all sample films were characterization by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), UV-vis spectroscopy, and photoluminescence (PL) techniques. Photocatalytic activities of CeO2, Bi2WO6 and 0.4CeO(2)/0.6Bi(2)WO(6) films were investigated via the degradation of Rhodamine B (RhB) under visible light irradiation. The three-layered films of 0.4CeO(2)/0.6Bi(2)WO(6) composite exhibit the highest photocatlytic activity. It was found that the synergistic effect of CeO2 and Bi2WO6 causes the enhanced photocatalytic activity of 0.4CeO(2)/0.6Bi(2)WO(6) composite by improving efficiency of interfacial charge transfer process. The formation of hydroxyl radicals (OH) on the surface of visible-light illuminated the composite film was detected by the luminescence technique using terephthalic acid as probe molecules. Based on the results of the present study, a reasonable mechanism of photocatalysis on CeO2/Bi2WO6 composite under visible light was proposed. (C) 2016 Elsevier B.V. All rights reserved.
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