Oxidant or catalyst for oxidation? The role of manganese oxides in the activation of peroxymonosulfate (PMS)

doi:10.1007/s11783-019-1158-8

Front. Environ. Sci. Eng.

2019, Vol. 13

Issue (5) : 65 https://doi.org/10.1007/s11783-019-1158-8

VIEWS & COMMENTS

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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Abstract

Manganese oxides (MnO_x) have been demonstrated to be effective materials to activate Oxone (i.e., PMS) to degrade various contaminants. However, the contribution of direct oxidation by MnO_x 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 MnO_x (as both oxidants and catalysts) in the activation of Oxone was briefly discussed. The findings offered new insights into the reaction mechanisms in PMS-MnO_x 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.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-019-1158-8
https://academic.hep.com.cn/fese/EN/Y2019/V13/I5/65

Fig.1 (a) Pseudo-first-order reaction rate constants of bisphenol A (BPA) degradation by Oxone-MnO₂ (total reactivity: k_tr) and MnO₂ (direct oxidative reactivity: k_or) 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-MnO_x.

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