Issue 3, 2021

A tale of two metal ions: contrasting behaviors of high oxidation states of Cu and Mn in a bicarbonate–H2O2 system

Abstract

In this study, the contrasting activities and pathways of Mn2+/Cu2+–HCO3 systems for Congo red (CR) dye degradation are presented. The Mn2+–HCO3 system (with the well-known MnIV[double bond, length as m-dash]O as the reactive species) did not degrade CR, while the Cu2+–HCO3 system (with high-valent Cu proposed as the reactive species) had a good oxidizing ability for CR. Further, HO radicals in the classic Fenton-like system made no contribution to CR degradation with both Cu and Fe ions as catalysts. The results indicate that reactive species in metal–HCO3 AOPs need prudent examination and better understanding of the underlying mechanism would benefit the development of more efficient AOPs.

Graphical abstract: A tale of two metal ions: contrasting behaviors of high oxidation states of Cu and Mn in a bicarbonate–H2O2 system

Supplementary files

Article information

Article type
Paper
Submitted
07 Oct 2020
Accepted
29 Dec 2020
First published
31 Dec 2020

Environ. Sci.: Water Res. Technol., 2021,7, 479-486

A tale of two metal ions: contrasting behaviors of high oxidation states of Cu and Mn in a bicarbonate–H2O2 system

Z. Yang, X. Tan, D. Tang, J. Li and J. Ma, Environ. Sci.: Water Res. Technol., 2021, 7, 479 DOI: 10.1039/D0EW00910E

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