DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kim, S | - |
dc.contributor.author | Choi, W | - |
dc.date.accessioned | 2016-04-01T02:14:02Z | - |
dc.date.available | 2016-04-01T02:14:02Z | - |
dc.date.created | 2009-02-28 | - |
dc.date.issued | 2005-03-24 | - |
dc.identifier.issn | 1520-6106 | - |
dc.identifier.other | 2005-OAK-0000004951 | - |
dc.identifier.uri | https://oasis.postech.ac.kr/handle/2014.oak/24715 | - |
dc.description.abstract | The visible-light-induced degradation reaction of 4-chlorophenol (4-CP) was investigated in aqueous suspension of pure TiO2. Contrary to common expectations, 4-CP could be degraded under visible illumination (lambda > 420 nm), generating chlorides and CO2 concomitantly. The observed visible reactivity was not due to the presence of trace UV light since the visible-light-induced reactions exhibited behaviors distinguished from those of UV-induced reactions. Dichloroacetate could not be degraded under visible light, whereas it degraded with a much faster rate than 4-CP under UV irradiation. The addition of tert-butyl alcohol, a common OH radical scavenger, did not affect the visible reactivity of 4-CP, which indicates that OH radicals are not involved. Other phenolic compounds such as phenol and 2,4-dichlorophenol were similarly degraded under visible light. The surface complexation between phenolic compounds and TiO2 appears to be responsible for the visible light reactivity. Diffuse reflectance UV-vis spectra showed that 4-CP adsorbed on TiO2 powder induced visible light absorption. The visible light reactivity among several TiO2 samples was apparently correlated with the surface area of TiO2. The visible-light-induced photocurrents on a TiO2 electrode could be obtained only in the presence of 4-CP. It is proposed that a direct electron transfer from surface-complexed phenol to the conduction band of TiO2 upon absorbing visible light (through ligand-to-metal charge transfer) initiates the oxidative degradation of phenolic compounds. When the surface complex formation was hindered by surface fluorination, surface platinization, and high pH, the visible-light-induced degradation of 4-CP was inhibited. The evidence of visible-light-induced reactions and the experimental conditions affecting the visible reactivity were discussed in detail. | - |
dc.description.statementofresponsibility | X | - |
dc.language | English | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.relation.isPartOf | JOURNAL OF PHYSICAL CHEMISTRY B | - |
dc.subject | CHARGE-TRANSFER COMPLEXES | - |
dc.subject | DIOXIDE-FLUORIDE SYSTEM | - |
dc.subject | INDUCED WATER CLEAVAGE | - |
dc.subject | TIO2 SURFACE | - |
dc.subject | ORGANIC-COMPOUNDS | - |
dc.subject | SENSITIZED TIO2 | - |
dc.subject | AZO-DYE | - |
dc.subject | PARTICLES | - |
dc.subject | PHOTODEGRADATION | - |
dc.subject | TRANSFORMATION | - |
dc.title | Visible-light-induced photocatalytic degradation of 4-chlorophenol and phenolic compounds in aqueous suspension of pure titania: Demonstrating the existence of a surface-complex-mediated path | - |
dc.type | Article | - |
dc.contributor.college | 환경공학부 | - |
dc.identifier.doi | 10.1021/JP045806Q | - |
dc.author.google | Kim, S | - |
dc.author.google | Choi, W | - |
dc.relation.volume | 109 | - |
dc.relation.issue | 11 | - |
dc.relation.startpage | 5143 | - |
dc.relation.lastpage | 5149 | - |
dc.contributor.id | 10105056 | - |
dc.relation.journal | JOURNAL OF PHYSICAL CHEMISTRY B | - |
dc.relation.index | SCI급, SCOPUS 등재논문 | - |
dc.relation.sci | SCI | - |
dc.collections.name | Journal Papers | - |
dc.type.rims | ART | - |
dc.identifier.bibliographicCitation | JOURNAL OF PHYSICAL CHEMISTRY B, v.109, no.11, pp.5143 - 5149 | - |
dc.identifier.wosid | 000227734500047 | - |
dc.date.tcdate | 2019-02-01 | - |
dc.citation.endPage | 5149 | - |
dc.citation.number | 11 | - |
dc.citation.startPage | 5143 | - |
dc.citation.title | JOURNAL OF PHYSICAL CHEMISTRY B | - |
dc.citation.volume | 109 | - |
dc.contributor.affiliatedAuthor | Choi, W | - |
dc.identifier.scopusid | 2-s2.0-15744389431 | - |
dc.description.journalClass | 1 | - |
dc.description.journalClass | 1 | - |
dc.description.wostc | 209 | - |
dc.description.scptc | 202 | * |
dc.date.scptcdate | 2018-05-121 | * |
dc.type.docType | Article | - |
dc.subject.keywordPlus | INDUCED WATER CLEAVAGE | - |
dc.subject.keywordPlus | ORGANIC-COMPOUNDS | - |
dc.subject.keywordPlus | TIO2 PARTICLES | - |
dc.subject.keywordPlus | AZO-DYE | - |
dc.subject.keywordPlus | DIOXIDE | - |
dc.subject.keywordPlus | TRANSFORMATION | - |
dc.subject.keywordPlus | OXIDATION | - |
dc.subject.keywordPlus | PHOTODEGRADATION | - |
dc.subject.keywordPlus | HYDROCARBONS | - |
dc.subject.keywordPlus | FLUORINATION | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Physical | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Chemistry | - |
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