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Issue 6, 2014
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Critical review of electrochemical advanced oxidation processes for water treatment applications

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Abstract

Electrochemical advanced oxidation processes (EAOPs) have emerged as novel water treatment technologies for the elimination of a broad-range of organic contaminants. Considerable validation of this technology has been performed at both the bench-scale and pilot-scale, which has been facilitated by the development of stable electrode materials that efficiently generate high yields of hydroxyl radicals (OH˙) (e.g., boron-doped diamond (BDD), doped-SnO2, PbO2, and substoichiometic- and doped-TiO2). Although a promising new technology, the mechanisms involved in the oxidation of organic compounds during EAOPs and the corresponding environmental impacts of their use have not been fully addressed. In order to unify the state of knowledge, identify research gaps, and stimulate new research in these areas, this review critically analyses published research pertaining to EAOPs. Specific topics covered in this review include (1) EAOP electrode types, (2) oxidation pathways of select classes of contaminants, (3) rate limitations in applied settings, and (4) long-term sustainability. Key challenges facing EAOP technologies are related to toxic byproduct formation (e.g., ClO4 and halogenated organic compounds) and low electro-active surface areas. These challenges must be addressed in future research in order for EAOPs to realize their full potential for water treatment.

Graphical abstract: Critical review of electrochemical advanced oxidation processes for water treatment applications

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Publication details

The article was received on 13 Dec 2013, accepted on 07 Feb 2014 and first published on 10 Feb 2014


Article type: Critical Review
DOI: 10.1039/C3EM00679D
Author version available: Download Author version (PDF)
Citation: Environ. Sci.: Processes Impacts, 2014,16, 1182-1203
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    Critical review of electrochemical advanced oxidation processes for water treatment applications

    B. P. Chaplin, Environ. Sci.: Processes Impacts, 2014, 16, 1182
    DOI: 10.1039/C3EM00679D

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