DC Field | Value | Language |
---|---|---|
dc.contributor.author | Jung, KY | ko |
dc.contributor.author | Park, SeungBin | ko |
dc.contributor.author | Ihm, Son Ki | ko |
dc.date.accessioned | 2009-05-29T09:42:37Z | - |
dc.date.available | 2009-05-29T09:42:37Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 2004-08 | - |
dc.identifier.citation | APPLIED CATALYSIS B-ENVIRONMENTAL, v.51, no.4, pp.239 - 245 | - |
dc.identifier.issn | 0926-3373 | - |
dc.identifier.uri | http://hdl.handle.net/10203/9217 | - |
dc.description.abstract | The local structure and the photoactivity of B2O3-SiO2/TiO2 ternary mixed oxides (SiO2 content was fixed as 30 at.% with respect to TiO2) was investigated by using XRD. FF-IR, BET, UV-vis spectra, and electron paramagnetic resonance (EPR) measurement. In FT-IR analysis, boron was incorporated into the framework of titania matrix with replacing Ti-O-Si with Si-O-B or Ti-O-B bonds. Also, paramagnetic species such as O- and Ti-3 defects were formed by the boron incorporation. In SiO2/TiO2 mixed oxides, a blue shift in the light absorption band was observed due to the quantization of band structure. All B2O3-SiO2/TiO2 samples had pure anatase phase and no rutile phase was formed even though the calcination temperature was over 900degreesC. Incorporating boron oxides of more than 10% enlarges the grain size of anatase phase and causes a red shift of the light absorption spectrum. The surface area was monotonically decreased with increasing the content of boron content. As a result, the photoactivity of B2O3-SiO2/TiO2 ternary mixed oxides was greatly influenced by the content of boron oxide. The highest photoactivity (g moles/min 1) was obtained when the boron content was 5% and seven times higher than that of silica/titania binary mixed oxide. In addition, the specific photoactivity (g moles/m(2)l) was maximum still at 5%. It was concluded that the large reduction of surface area, the change of band structure, and more formation of bulk Ti3+ sites are responsible for the deterioration in the photoactivity of BiO3-SiO2/TiO2 ternary mixed oxides when the content of boron is over 10%, although their crystallinity was enhanced by increasing the calcination temperature with keeping anatase phase. (C) 2004 Elsevier B.V. All rights reserved. | - |
dc.description.sponsorship | Department of Chemical Engineering, KAIST is supported by the Brain Korea 21 project. S.B. Park would like to give special thanks to the Center for Ultramicrochemical Process Systems (CUPS) for supporting part of this research and S.K. Ihm would like to thank for the support of National Research Laboratory (NRL) for Environmental Catalysis. | en |
dc.language | English | - |
dc.language.iso | en_US | en |
dc.publisher | ELSEVIER SCIENCE BV | - |
dc.subject | ELECTRON-PARAMAGNETIC-RES | - |
dc.subject | STOICHIOMETRIC DECOMPOSITION | - |
dc.subject | TITANIA-SILICA | - |
dc.subject | UV-IRRADIATION | - |
dc.subject | CATALYSTS | - |
dc.subject | WATER | - |
dc.subject | BORON | - |
dc.subject | TIO2 | - |
dc.subject | TRICHLOROETHYLENE | - |
dc.subject | PHOTOACTIVITY | - |
dc.title | Local structure and photocatalytic activity of B2O3-SiO2/TiO2 ternary mixed oxides prepared by sol-gel method | - |
dc.type | Article | - |
dc.identifier.wosid | 000222413100003 | - |
dc.identifier.scopusid | 2-s2.0-2942532994 | - |
dc.type.rims | ART | - |
dc.citation.volume | 51 | - |
dc.citation.issue | 4 | - |
dc.citation.beginningpage | 239 | - |
dc.citation.endingpage | 245 | - |
dc.citation.publicationname | APPLIED CATALYSIS B-ENVIRONMENTAL | - |
dc.identifier.doi | 10.1016/j.apcatb.2004.03.010 | - |
dc.embargo.liftdate | 9999-12-31 | - |
dc.embargo.terms | 9999-12-31 | - |
dc.contributor.localauthor | Park, SeungBin | - |
dc.contributor.localauthor | Ihm, Son Ki | - |
dc.contributor.nonIdAuthor | Jung, KY | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | pholocatalyst | - |
dc.subject.keywordAuthor | mixed oxide | - |
dc.subject.keywordAuthor | crystallinity | - |
dc.subject.keywordAuthor | sol-gel | - |
dc.subject.keywordAuthor | titania | - |
dc.subject.keywordPlus | ELECTRON-PARAMAGNETIC-RES | - |
dc.subject.keywordPlus | STOICHIOMETRIC DECOMPOSITION | - |
dc.subject.keywordPlus | TITANIA-SILICA | - |
dc.subject.keywordPlus | UV-IRRADIATION | - |
dc.subject.keywordPlus | CATALYSTS | - |
dc.subject.keywordPlus | WATER | - |
dc.subject.keywordPlus | BORON | - |
dc.subject.keywordPlus | TIO2 | - |
dc.subject.keywordPlus | TRICHLOROETHYLENE | - |
dc.subject.keywordPlus | PHOTOACTIVITY | - |
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