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Review of iron-free Fenton-like systems for activating H2O2 in advanced oxidation processes SCIE SCOPUS

Title
Review of iron-free Fenton-like systems for activating H2O2 in advanced oxidation processes
Authors
Alok D. BokareChoi, W
Date Issued
2014-06-30
Publisher
ELSEVIER SCIENCE BV
Abstract
Iron-catalyzed hydrogen peroxide decomposition for in situ generation of hydroxyl radicals (HO center dot) has been extensively developed as advanced oxidation processes (AOPs) for environmental applications. A variety of catalytic iron species constituting metal salts (in Fe2+ or Fe3+ form), metal oxides (e.g., Fe2O3, Fe3O4), and zero-valent metal (Fe-0) have been exploited for chemical (classical Fenton), photochemical (photo-Fenton) and electrochemical (electro-Fenton) degradation pathways. However, the requirement of strict acidic conditions to prevent iron precipitation still remains the bottleneck for iron-based AOPs. In this article, we present a thorough review of alternative non-iron Fenton catalysts and their reactivity towards hydrogen peroxide activation. Elements with multiple redox states (like chromium, cerium, copper, cobalt, manganese and ruthenium) all directly decompose H2O2 into HO center dot through conventional Fenton-like pathways. The in situ formation of H2O2 and decomposition into HO center dot can be also achieved using electron tranSfer mechanism in zero-valent aluminum/O-2 system. Although these Fenton systems (except aluminum) work efficiently even at neutral pH, the H2O2 activation mechanism is very specific to the nature of the catalyst and critically depends on its composition. This review describes in detail the complex mechanisms and emphasizes on practical limitations influencing their environmental applications. (C) 2014 Elsevier B.V. All rights reserved.
Keywords
Advanced oxidation processes (AOPs); Hydrogen peroxide; Fenton; Hydroxyl radical; Water treatment; WASTE-WATER TREATMENT; DYE ORANGE-II; NANOSIZED MN3O4/SBA-15 CATALYST; HYDROGEN-PEROXIDE OXIDATION; RADICAL-GENERATING SYSTEMS; TURQUOISE BLUE G-133; AQUEOUS-SOLUTION; PHOTO-FENTON; AZO-DYE; SYNTHETIC DYES
URI
https://oasis.postech.ac.kr/handle/2014.oak/14490
DOI
10.1016/J.JHAZMAT.2014.04.054
ISSN
0304-3894
Article Type
Article
Citation
JOURNAL OF HAZARDOUS MATERIALS, vol. 275, page. 121 - 135, 2014-06-30
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최원용CHOI, WONYONG
Div of Environmental Science & Enginrg
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