DC Field | Value | Language |
---|---|---|
dc.contributor.author | CHOI, YEOSEON | - |
dc.contributor.author | Min Seok Koo | - |
dc.contributor.author | Alok D. Bokare | - |
dc.contributor.author | Dong-hyo Kim | - |
dc.contributor.author | Detlef W. Bahnemann | - |
dc.contributor.author | CHOI, WONYONG | - |
dc.date.accessioned | 2018-05-04T02:36:35Z | - |
dc.date.available | 2018-05-04T02:36:35Z | - |
dc.date.created | 2018-03-05 | - |
dc.date.issued | 2017-03 | - |
dc.identifier.issn | 0013-936X | - |
dc.identifier.uri | https://oasis.postech.ac.kr/handle/2014.oak/41253 | - |
dc.description.abstract | We investigated a sequential photocatalysis-dark reaction, wherein organic pollutants were degraded on Ag/TiO2 under UV irradiation and the dark reduction of hexavalent chromium (Cr(VI)) was subsequently followed. The photocatalytic oxidation of 4-chlorophenol (4-CP), a test organic substrate, induced the generation of degradation intermediates and the storage of electrons in Ag/TiO2 which were then utilized for reducing Cr(VI) in the postirradiation period. The dark reduction efficiency of Cr(VI) was much higher with Ag/TiO2 (87%), compared with bare TiO2 (27%) and Pt/TiO2 (22%). The Cr(VI) removal by Ag/TiO2 (87%) was contributed by adsorption (31%), chemical reduction by intermediates of 4-CP degradation (26%), and reduction by electrons stored in Ag (30%). When formic acid, humic acid or ethanol was used as an alternative organic substrate, the electron storage effect was also observed. The postirradiation removal of Cr(VI) on Ag/TiO2 continued for hours, which is consistent with the observation that a residual potential persisted on the Ag/TiO2 electrode in the dark whereas little residual potential was observed on bare TiO2 and Pt/TiO2 electrodes. The stored electrons in Ag/TiO2 and their transfer to Cr(VI) were also indicated by the UV–visible absorption spectral change. Moreover, the electrons stored in the preirradiated Ag/TiO2 reacted with O2 with showing a sign of low-level OH radical generation in the dark period. | - |
dc.language | English | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.relation.isPartOf | ENVIRONMENTAL SCIENCE & TECHNOLOGY | - |
dc.title | Sequential Process Combination of Photocatalytic Oxidation and Dark Reduction for the Removal of Organic Pollutants and Cr(VI) using Ag/TiO2 | - |
dc.type | Article | - |
dc.identifier.doi | 10.1021/acs.est.6b06303 | - |
dc.type.rims | ART | - |
dc.identifier.bibliographicCitation | ENVIRONMENTAL SCIENCE & TECHNOLOGY, v.51, no.7, pp.3973 - 3981 | - |
dc.identifier.wosid | 000398646500043 | - |
dc.date.tcdate | 2019-02-01 | - |
dc.citation.endPage | 3981 | - |
dc.citation.number | 7 | - |
dc.citation.startPage | 3973 | - |
dc.citation.title | ENVIRONMENTAL SCIENCE & TECHNOLOGY | - |
dc.citation.volume | 51 | - |
dc.contributor.affiliatedAuthor | CHOI, YEOSEON | - |
dc.contributor.affiliatedAuthor | CHOI, WONYONG | - |
dc.identifier.scopusid | 2-s2.0-85020025015 | - |
dc.description.journalClass | 1 | - |
dc.description.journalClass | 1 | - |
dc.description.wostc | 38 | - |
dc.type.docType | Article | - |
dc.subject.keywordPlus | VISIBLE-LIGHT | - |
dc.subject.keywordPlus | TIO2 PHOTOCATALYSIS | - |
dc.subject.keywordPlus | CATALYTIC-ACTIVITY | - |
dc.subject.keywordPlus | OXIDE COMPOSITE | - |
dc.subject.keywordPlus | STOPPED-FLOW | - |
dc.subject.keywordPlus | FERMI-LEVEL | - |
dc.subject.keywordPlus | NANOPARTICLES | - |
dc.subject.keywordPlus | DEGRADATION | - |
dc.subject.keywordPlus | SURFACE | - |
dc.subject.keywordPlus | 4-CHLOROPHENOL | - |
dc.relation.journalWebOfScienceCategory | Engineering, Environmental | - |
dc.relation.journalWebOfScienceCategory | Environmental Sciences | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Engineering | - |
dc.relation.journalResearchArea | Environmental Sciences & Ecology | - |
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