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

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Effects of inorganic oxidants on kinetics and mechanisms of WO3-mediated photocatalytic degradation

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dc.contributor.author Kim, Heechan ko
dc.contributor.author Yoo, Ha-Young ko
dc.contributor.author Hong, Seokwon ko
dc.contributor.author Lee, Sanghyeop ko
dc.contributor.author Lee, Seunghak ko
dc.contributor.author Park, Baek-Soo ko
dc.contributor.author Park, Hyunwoong ko
dc.contributor.author Lee, Changha ko
dc.contributor.author Lee, Jaesang ko
dc.date.available 2014-09-11T07:00:48Z -
dc.date.created 2014-09-04 ko
dc.date.issued 2015-01 ko
dc.identifier.citation APPLIED CATALYSIS B-ENVIRONMENTAL, v.162, pp.515 - 523 ko
dc.identifier.issn 0926-3373 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/5848 -
dc.description.abstract This study evaluates the capacity of various inorganic oxidants (IO4 -, HSO5 -, S2O8 2-, H2O2, and BrO3 -) to act as alternative electron acceptors for WO3-mediated photocatalytic oxidation. Combination with IO4 - drastically increased the rate of photocatalytic degradation of 4-chlorophenol by WO3, while the other oxyanions only negligibly improved the photocatalytic activity. The extent of the photocatalytic performance enhancement in the presence of inorganic oxidants correlated well with the efficiencies for: (1) hydroxylation of benzoic acid as an OH probe, (2) dechlorination of dichloroaceate as a hole scavenger, and (3) water oxidation with O2 evolution. The results suggest that the promoted charge separation primarily causes kinetic enhancement in photocatalytic degradation using the WO3/IO4 - system. In marked contrast to the substrate-dependent activity of the photochemically activated IO4 - (generating selective IO3), the efficiency of the WO3/IO4 - system for photocatalytic degradation did not sensitively depend on the type of target organic compound, which implies the existence of a minor contribution of the photocatalytic reduction pathway associated with the production of IO3 as a secondary oxidant. On the other hand, the insignificant inhibitory effect of methanol as an OH quencher may reveal the possible involvement of SO4 - in the improved photocatalytic activity of the WO3/HSO5 - system. The alternative use of platinized WO3, where the interfacial electron transfer occurs in a concerted step, achieved a highly accelerated photocatalytic oxidation in the presence of HSO5 - and polyoxometalates as electron scavengers. In particular, the surface loading of nanoscale platinum appeared to retard the reaction route for SO4 - generation associated with a one-electron transfer. ko
dc.description.statementofresponsibility close -
dc.language 영어 ko
dc.publisher ELSEVIER SCIENCE BV ko
dc.title Effects of inorganic oxidants on kinetics and mechanisms of WO3-mediated photocatalytic degradation ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84905245216 ko
dc.identifier.wosid 000343686900060 ko
dc.type.rims ART ko
dc.description.wostc 0 *
dc.description.scopustc 0 *
dc.date.tcdate 2015-05-06 *
dc.date.scptcdate 2014-09-04 *
dc.identifier.doi 10.1016/j.apcatb.2014.07.019 ko
dc.identifier.url http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84905245216 ko
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