A1 Journal article (refereed), original research

Insight into Electroreductive Activation Process of Peroxydisulfate for Eliminating Organic Pollution: Essential Role of Atomic Hydrogen


Publication Details
Authors: Zeng Huabin, Lan Huachun, An Xiaoqiang, Repo Eveliina, Park Yuri, Pastushok Olga, Liu Huijuan, Qu Jiuhui
Publisher: Elsevier
Publication year: 2020
Language: English
Related Journal or Series Information: Chemical Engineering Journal
Journal acronym: Chem Eng J
ISSN: 1385-8947
eISSN: 1873-3212
JUFO-Level of this publication: 3
Open Access: Not an Open Access publication

Abstract

Electrochemically activating peroxydisulfate (PDS) can eliminate organic pollution using electron
as activator without the involvement of byproducts. Notwithstanding, the process suffered from
long hydraulic retention time, and the activation regime remained unclear. Herein, using Pd/Al2O3
catalyst as particle electrode for initiating PDS oxidation in the cathodic cell can degrade various
organic pollutants with varying the kinetic constants from 0.0256 min-1 to 0.0645 min-1, which
were at least 5-fold higher than that in previous studies. The reactive oxygen species were
determined to be SO4
•–/•OH. These radicals were readily formed from the single-electron reduction
of PDS by electro-induced atomic hydrogen (indirect reduction mechanism), while direct twoelectron
transfer from electro-generated H2 to PDS consumed its oxidation capacity without
yielding radical due to the higher energy barrier. Revealing the mechanism of electrochemically
unleashing the oxidative power of PDS into SO4
•– can rationalize the design of scalable electrode
for PDS-based water purification.


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Last updated on 2021-05-01 at 13:03