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A Silica-Supported Iron Oxide Catalyst Capable of Activating Hydrogen Peroxide at Neutral pH Values

Open access
Pham, Anh Le-Tuan, Lee, Changha, Doyle, Fiona M., Sedlak, David L.·2009·Environmental Science & Technology

Abstract

Iron oxides catalyze the conversion of hydrogen peroxide (H(2)O(2)) into oxidants capable of transforming recalcitrant contaminants. Unfortunately, the process is relatively inefficient at circumneutral pH values because of competing reactions that decompose H(2)O(2) without producing oxidants. Silica- and alumina-containing iron oxides prepared by sol-gel processing of aqueous solutions containing Fe(ClO(4))(3), AlCl(3), and tetraethyl orthosilicate efficiently catalyzed the decomposition of H(2)O(2) into oxidants capable of transforming phenol at circumneutral pH values. Relative to hematite, goethite, and amorphous FeOOH, the silica-iron oxide catalyst exhibited a stoichiometric efficiency, defined as the number of moles of phenol transformed per mole of H(2)O(2) consumed, which was 10-40 times higher than that of the iron oxides. The silica-alumina-iron oxide catalyst had a stoichiometric efficiency that was 50-80 times higher than that of the iron oxides. The significant enhancement in oxidant production is attributable to the interaction of Fe with Al and Si in the mixed oxides, which alters the surface redox processes, favoring the production of strong oxidants during H(2)O(2) decomposition.

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Metadata

Authors
Pham, A. L.-T., Lee, C., Doyle, F. M., & Sedlak, D. L.
Venue
Environmental Science & Technology
Published
2009-10-30
Volume
43
Issue
23
Pages
8930-8935
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
OpenAlex
W2077452659
Cited by
364
References
1
FWCI
14.59
Type
journal article
Language
en
Open access
green

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