title: Efficient activation of peroxymonosulfate by magnetic Mn-MGO for degradation of bisphenol A.
abstract: A heterogeneous manganese/magnetite/graphene oxide (Mn-MGO) hybrid catalyst was fabricated through the reduction of KMnO4by ethylene glycol in the presence of magnetite/GO (MGO) particles. The Mn-MGO catalyst exhibited high efficacy and long-term stability in activating peroxymonosulfate (PMS) to generate sulfate radicals for the removal of bisphenol A (BPA) from water. The results of the batch experiments indicated that an increase in the catalyst dose and solution pH could enhance BPA degradation in the coupled Mn-MGO/PMS system. Regardless of the initial pH, the solution pH significantly dropped after the reaction, which was caused by catalytic PMS activation. The production of sulfate radicals and hydroxyl radicals was validated through radical quenching and electron paramagnetic resonances (EPR) tests. BPA degradation pathways were proposed on the basis of LC-MS and GC-MS analyses. Finally, a possible mechanism of catalytic PMS activation was proposed that involved electron transfer from MnO or Mn2O3to PMS with the generation of sulfate radicals, protons and MnO2, as well as the simultaneous reduction of MnO2by PMS.
authors.affiliation: School of Environmental Studies, China University of Geosciences, Wuhan 430074, P.R. China.
authors.forename: Jiangkun
authors.initials: J
authors.lastname: Du
authors.affiliation: School of Environmental Studies, China University of Geosciences, Wuhan 430074, P.R. China. Electronic address: bjianguo@cug.edu.cn.
authors.forename: Jianguo
authors.initials: J
authors.lastname: Bao
authors.affiliation: School of Environmental Studies, China University of Geosciences, Wuhan 430074, P.R. China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Liu
authors.affiliation: School of Environmental Studies, China University of Geosciences, Wuhan 430074, P.R. China.
authors.forename: Haibo
authors.initials: H
authors.lastname: Ling
authors.affiliation: School of Environmental Studies, China University of Geosciences, Wuhan 430074, P.R. China.
authors.forename: Han
authors.initials: H
authors.lastname: Zheng
authors.affiliation: Center for Materials Architecturing, Korea Institute of Science and Technology, Seoul, 136-791, Republic of Korea. Electronic address: kim_sh@kist.re.kr.
authors.forename: Sang Hoon
authors.initials: SH
authors.lastname: Kim
authors.affiliation: Environmental Engineering and Science Program, Department of Biomedical, Chemical and Environmental Engineering, 705 Engineering Research Center, University of Cincinnati, Cincinnati, OH 45221-0012, United States. Electronic address: dionysios.d.dionysiou@uc.edu.
authors.forename: Dionysios D
authors.initials: DD
authors.lastname: Dionysiou
keywords: Bisphenol A; Degradation; Heterogeneous catalysis; Manganese oxide; Peroxymonosulfate activation