Review on the application of modified iron oxides as heterogeneous catalysts in Fenton reactions

Heterogeneous Fenton reaction is an advanced oxidation process which has gained wide spread acceptance for higher removal efficiency of recalcitrant organic contaminants under wide range of pH compared to homogeneous reactions. Conventionally, iron oxides are used as heterogeneous catalysts for Fent...

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Bibliographic Details
Published in:Journal of cleaner production 2014-02, Vol.64, p.24-35
Main Authors: Rahim Pouran, Shima, Abdul Raman, Abdul Aziz, Wan Daud, Wan Mohd Ashri
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied ecology
Applied sciences
Biological and medical sciences
Conservation, protection and management of environment and wildlife
Environment and sustainable development
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Heterogeneous catalyst
Oxygen vacancies
Pollution
Redox pairs
Transition metal substituted iron oxide
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Summary:Heterogeneous Fenton reaction is an advanced oxidation process which has gained wide spread acceptance for higher removal efficiency of recalcitrant organic contaminants under wide range of pH compared to homogeneous reactions. Conventionally, iron oxides are used as heterogeneous catalysts for Fenton oxidation system because of their abundance, easy separation and lower cost. This paper reviews the substitution of iron in an iron oxide with other transition metals as a mean to improve the properties of the iron oxide towards higher performance for contaminant degradation. Several studies have reported enhanced performance resulted from this substitution based on two possible mechanisms. First is the conjugation of redox pairs of iron species and imported active ion in hydroxyl radical production cycle. Second: the generation of oxygen vacancies as active sites on the surface of catalyst via adjustments for unequal charge substitutions. This class of catalysts is anticipated to work effectively for treatment of various recalcitrant wastewaters using Fenton oxidation system. Subsequently, the stability of the produced catalyst needs to be examined under various experimental conditions to prevent the adverse effects of transition metals on the receiving environment.
ISSN:0959-6526
1879-1786
DOI:10.1016/j.jclepro.2013.09.013