Journal
CHEMOSPHERE
Volume 210, Issue -, Pages 257-266Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2018.07.010
Keywords
Binary composites; alpha-Fe2O3; Bi12O12Cl2; Photocatalytic; Photo-Fenton; Mechanism
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Funding
- National Natural Science Foundation of China [21207089]
- Natural Science Foundation of Shanghai [17ZR1419200]
- science and technology development project of University of Shanghai for Science and Technology [2017KJFZ073]
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A set of binary composites alpha-Fe2O3/Bi12O17Cl2 were established through an in-situ deposition route and these samples were systematically characterized by a collection of analytical techniques. Scanning electron microscopy, UV-vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy proved the coexistence of expected two components. High resolution transmission electron microscopy and selected-area electron diffraction indicated the formation of heterojunction domains with the intimate contact of both semiconductors. The degradation behavior of as-synthesized samples was evaluated under visible-light irradiation and the enhanced outcome was observed over dye methyl orange (MO) and colorless 2,4-dichlorophenol (2,4-DCP), mainly attributing to favorable optical and morphological merits, and a suitable well-aligned band structure in these binary composites with a suitable phase composition as well. In addition, these composites showed an obvious photo-Fenton feature that significantly improved the catalytic degradation efficiency over 2,4-DCP when the reagent H2O2 was introduced, indicating the destruction efficiency was controlled by a synergtic effect from both photocatalytic and photo-Fenton degradation routes. Based upon the detection of reactive radical species, a primary synergistic mechanism was eventually speculated. (C) 2018 Elsevier Ltd. All rights reserved.
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