Journal
JOURNAL OF MATERIALS RESEARCH
Volume 33, Issue 21, Pages 3549-3558Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/jmr.2018.246
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Funding
- state supported project funds for research and demonstration on the Key Technology for Clean Production in Textile Printing and Dyeing [2014BAC13B02]
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Activation of persulfate (PS) by ultraviolet light or transition metal catalysts has been extensively studied. However, little is known about the activation of PS by iron oxychloride (FeOCl) in the presence of visible light irradiation. Herein, the catalytic activity of FeOCl was developed for oxidative degradation of rhodamine B (RhB) with the FeOCl/PS/Vis process. The characterization of FeOCl for reaction kinetics, degradation mechanism, and catalyst stability was investigated. It is found that the redox cycle of iron species and photoinduced electrons formed on the FeOCl catalyst surface can effectively activate PS, to generate radicals. Based on quenching experiments and electron paramagnetic resonance, the photogenerated holes (h(+) ) and sulfate radicals (SO4-center dot) are the predominant reactive oxidants for RhB decolorization, while superoxide radicals (center dot O-2(-)) and hydroxyl radicals (center dot OH) are also involved. Moreover, FeOCl shows good catalytic performance in a wide range of pH values (pH = 3-10) and excellent reusability and stability, as well.
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