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Download fileGeneration of Active Mn(III)aq by a Novel Heterogeneous Electro-permanganate Process with Manganese(II) as Promoter and Stabilizer
journal contribution
posted on 2019-06-26, 00:00 authored by Yunhua Zhu, Xuxu Wang, Jing Zhang, Lei Ding, Junfeng Li, Huaili Zheng, Chun ZhaoOur
study on the synergetic effect of electrolysis and permanganate
(E-PM) revealed a novel alternative method for generating active Mn(III)aq heterogeneously by electrochemically activating PM with
Mn2+ as promoter and stabilizer. We systematically explored
the generation mechanism of Mn(III)aq. It indicated that
all three components (electrolysis + PM + Mn2+) were necessary
to facilitate the generation of active Mn(III) in the E-PM-Mn2+ process. It was worth noting that Mn2+, as essential
promoter and Mn(III)aq stabilizer, could considerably enhance
the concentration of Mn(III) in the E-PM-Mn2+ process.
Further study revealed that the active Mn(III) was mainly produced
on cathode rather than in aqueous solution or on anode. In addition,
the soluble Mn(III)aq generated in the E-PM-Mn2+ process was demonstrated to be very efficient for the degradation
and mineralization of diclofenac (DCF) as well as methyl blue, carbamazepine,
phenol, sulfamethoxazole, and nitrobenzene. Moreover, the effects
of the main operating parameters (Mn2+ dosage, PM dosage,
applied current density, pH of solution, and contaminant concentration)
and different water matrices on the E-PM-Mn2+ process were
investigated systematically. Possible degradation pathways of DCF
in the E-PM-Mn2+ process were also proposed. The results
demonstrated that the E-PM-Mn2+ system based on active
Mn(III)aq could create a more efficient, sustainable, and
less energy costing technology for water treatment.
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