Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 546, Issue -, Pages 139-151Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.03.028
Keywords
Fe3O4/BiOBr; Regular combination; Photocatalysis; Photosensitization; Degradation mechanism; Wastewater treatment
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Funding
- National Natural Science Foundation of China [21776196, 51778397, 21707098]
- National Key Research and Development Project [2016YFB0600502]
- Innovative Projects for Post-graduate Education of Shanxi Province [2018BY046]
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The magnetic Fe3O4/BiOBr composites with different molar ratios were prepared by a new two-step method. The effect of different Fe3O4 contents on composites' properties was detected through XRD, SEM, TEM, HR-TEM, XPS, Uv-vis DRS, PL and BET. When the molar ratio of Fe3O4 nanospheres and BiOBr nanosheets is 0.5:1, the two are combined regularly to form 3D flower-like hierarchical heterostructure. This phenomenon is firstly found and can provide a reference for synthesizing other regularly combined magnetic heterostructure catalysts. The degradation activity for Rhodamine B (RhB) is much stronger than that of the previous studies under visible-light irradiation. 3D flower-like Fe3O4/BiOBr (0.5:1) heterostructure possesses great advantages including excellent magnetic separation, remarkable reutilization and stability. Through active species detection and liquid chromatography mass spectrometry (LC-MS) analysis, the degradation mechanisms of RhB are summarized (a) RhB photosensitization and (b) RhB moleculs attacked by radicals and a new possible degradation path was to be presented. This study offers a new method to prepare a regularly combined magnetic Fe3O4/BiOBr photocatalytic material and demonstrates its wonderful application for degradation of organic contaminants in aquatic environment. (C) 2019 Published by Elsevier Inc.
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