Activation of peroxymonosulfate by α-MnO 2 for Orange Ⅰ removal in water

Developing high-efficiency catalysts for peroxymonosulfate (PMS)-based advanced oxidation processes is important for eliminating pollutants in water. Herein, α-MnO with major exposed {110} and {100} facets prepared via a hydrothermal method were used as catalysts to activate PMS for the degradation...

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Bibliographic Details
Published in:Environmental research 2022-07, Vol.210, p.112919
Main Authors: Yang, Yusong, Zhao, Ying, Zong, Yuan, Wu, Ruiqi, Zhang, Mingyi, Feng, Jing, Wei, Tong, Ren, Yueming, Ma, Jun
Format: Article
Language:English
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Summary:Developing high-efficiency catalysts for peroxymonosulfate (PMS)-based advanced oxidation processes is important for eliminating pollutants in water. Herein, α-MnO with major exposed {110} and {100} facets prepared via a hydrothermal method were used as catalysts to activate PMS for the degradation of Orange Ⅰ (OⅠ). α-MnO -100, with more abundant surface hydroxyl groups and greater reductive ability, performed remarkably better than α-MnO -110 for degrading OⅠ. OⅠ removal of 86.20% was obtained in the α-MnO -100/PMS system. The apparent rate constant of OⅠ removal over α-MnO -100 was 2.11 times higher than that of α-MnO -110. The effects of PMS concentration, catalyst dosage, OⅠ concentration, initial pH, anions and humic acid (HA) on OⅠ degradation in the α-MnO -100/PMS system were systematically investigated. Quenching experiments and electron paramagnetic resonance (EPR) demonstrated that SO , •OH, O and O were the reactive oxygen species (ROS) in the α-MnO -100/PMS system. Moreover, the possible degradation pathway of OⅠ in the α-MnO -100/PMS system was proposed. This work provides an ideal metal oxide catalyst for sewage remediation.
ISSN:1096-0953