Clays and oxide minerals as catalysts and nanocatalysts in Fenton-like reactions - A review

E. G. Garrido-Ramírez, B. K G Theng, M. L. Mora

Research output: Contribution to journalReview articlepeer-review

627 Citations (SciVal)

Abstract

Advanced oxidation processes (AOP), involving the generation of highly oxidizing radical species, have attracted much attention because of their potential in eliminating recalcitrant organic pollutants from different environmental matrices. Among the most investigated AOP is the Fenton reaction in which hydroxyl radicals (HO{radical dot}) are generated through the catalytic reaction of Fe(II)/Fe(III) in the presence of hydrogen peroxide. The use of clays and iron-oxide minerals as catalysts of Fenton-like reactions is a promising alternative for the decontamination of soils, groundwaters, sediments, and industrial effluents. The low cost, abundance, and environmentally friendly nature of clay minerals and iron oxides are an added advantage. Additionally, the introduction of nanoparticles in heterogeneous catalytic processes has led to appreciable improvements in catalytic efficiency. Here we review the application of clays and iron-oxide minerals as supports or active catalysts in Fenton-like reactions, and summarize the latest advances in nanocatalyst development. We also evaluate the potential use of allophane nanoparticles, coated with iron oxides, as catalysts of Fenton-like reactions.

Original languageEnglish
Pages (from-to)182-192
Number of pages11
JournalApplied Clay Science
Volume47
Issue number3-4
DOIs
Publication statusPublished - Feb 2010

Keywords

  • Allophane
  • Catalysts
  • Clays
  • Fenton-like reaction
  • Oxide minerals
  • Zeolites

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geology

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