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Lee, Changha
Advanced Redox Technology (ART) Lab
Research Interests
  • Water Treatment, Advanced Oxidation/Reduction, Water Chemistry, Environmental Catalyst


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

DC Field Value Language Pham, Anh Le-Tuan ko Lee, Changha ko Doyle, Fiona M. ko Sedlak, David L. ko 2014-04-10T01:14:16Z - 2013-06-07 ko 2009-12 -
dc.identifier.citation ENVIRONMENTAL SCIENCE & TECHNOLOGY, v.43, no.23, pp.8930 - 8935 ko
dc.identifier.issn 0013-936X ko
dc.identifier.uri -
dc.identifier.uri ko
dc.description.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. ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher AMER CHEMICAL SOC ko
dc.subject Aqueous solutions ko
dc.subject Iron oxide catalyst ko
dc.subject Mixed oxide ko
dc.subject Neutral pH ko
dc.subject Oxidant production ko
dc.subject pH value ko
dc.subject Silica-alumina ko
dc.subject Sol-Gel processing ko
dc.subject Strong oxidants ko
dc.subject Surface redox process ko
dc.subject Tetra-ethyl-ortho-silicate ko
dc.title A Silica-Supported Iron Oxide Catalyst Capable of Activating Hydrogen Peroxide at Neutral pH Values ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-72249112169 ko
dc.identifier.wosid 000272038900042 ko
dc.type.rims ART ko
dc.description.wostc 84 *
dc.description.scopustc 75 * 2015-02-28 * 2014-08-20 *
dc.identifier.doi 10.1021/es902296k ko
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