Issue 80, 2023

Advanced electrocatalytic redox processes for environmental remediation of halogenated organic water pollutants

Abstract

Halogenated organic compounds are widespread, and decades of heavy use have resulted in global bioaccumulation and contamination of the environment, including water sources. Here, we introduce the most common halogenated organic water pollutants, their classification by type of halogen (fluorine, chlorine, or bromine), important policies and regulations, main applications, and environmental and human health risks. Remediation techniques are outlined with particular emphasis on carbon–halogen bond strengths. Aqueous advanced redox processes are discussed, highlighting mechanistic details, including electrochemical oxidations and reductions of the water–oxygen system, and thermodynamic potentials, protonation states, and lifetimes of radicals and reactive oxygen species in aqueous electrolytes at different pH conditions. The state of the art of aqueous advanced redox processes for brominated, chlorinated, and fluorinated organic compounds is presented, along with reported mechanisms for aqueous destruction of select PFAS (per- and polyfluoroalkyl substances). Future research directions for aqueous electrocatalytic destruction of organohalogens are identified, emphasizing the crucial need for developing a quantitative mechanistic understanding of degradation pathways, the improvement of analytical detection methods for organohalogens and transient species during advanced redox processes, and the development of new catalysts and processes that are globally scalable.

Graphical abstract: Advanced electrocatalytic redox processes for environmental remediation of halogenated organic water pollutants

Article information

Article type
Highlight
Submitted
30 Jun 2023
Accepted
11 Sep 2023
First published
22 Sep 2023
This article is Open Access
Creative Commons BY license

Chem. Commun., 2023,59, 11895-11922

Advanced electrocatalytic redox processes for environmental remediation of halogenated organic water pollutants

M. K. Wilsey, T. Taseska, Z. Meng, W. Yu and A. M. Müller, Chem. Commun., 2023, 59, 11895 DOI: 10.1039/D3CC03176D

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