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Frontiers of Environmental Science & Engineering

Front. Environ. Sci. Eng.    2019, Vol. 13 Issue (5) : 65
Oxidant or catalyst for oxidation? The role of manganese oxides in the activation of peroxymonosulfate (PMS)
Jianzhi Huang, Huichun Zhang()
Department of Civil Engineering, Case Western Reserve University, Cleveland, OH 44106 , USA
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Manganese oxides (MnOx) have been demonstrated to be effective materials to activate Oxone (i.e., PMS) to degrade various contaminants. However, the contribution of direct oxidation by MnOx to the total contaminant degradation under acidic conditions was often neglected in the published work, which has resulted in different and even conflicting interpretations of the reaction mechanisms. Here, the role of MnOx (as both oxidants and catalysts) in the activation of Oxone was briefly discussed. The findings offered new insights into the reaction mechanisms in PMS-MnOx and provided a more accurate approach to examine contaminant degradation for water/wastewater treatment.

Keywords Peroxymonosulfate      Manganese oxides      Catalyst, Oxidant     
Corresponding Author(s): Huichun Zhang   
Issue Date: 23 August 2019
 Cite this article:   
Jianzhi Huang,Huichun Zhang. Oxidant or catalyst for oxidation? The role of manganese oxides in the activation of peroxymonosulfate (PMS)[J]. Front. Environ. Sci. Eng., 2019, 13(5): 65.
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Jianzhi Huang
Huichun Zhang
Fig.1  (a) Pseudo-first-order reaction rate constants of bisphenol A (BPA) degradation by Oxone-MnO2 (total reactivity: ktr) and MnO2 (direct oxidative reactivity: kor) at pH 3.07; (b) XRD patterns of different structures of MnO2 (Huang et al., 2019).
Fig.2  Scheme 1 Reaction mechanisms in the degradation of contaminants by PMS-MnOx.
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