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Article: Enhanced photocatalytic activity of Ce3+-TiO2 for 2-mercaptobenzothiazole degradation in aqueous suspension for odour control

TitleEnhanced photocatalytic activity of Ce3+-TiO2 for 2-mercaptobenzothiazole degradation in aqueous suspension for odour control
Authors
Keywords2-Mercaptobenzothiazole
Adsorption
Cerium Ion
Titanium Dioxide
Visible Light
Issue Date2005
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/apcata
Citation
Applied Catalysis A: General, 2005, v. 285 n. 1-2, p. 181-189 How to Cite?
AbstractA series of cerium ion-doped titanium dioxide (Ce3+-TiO 2) catalysts with special 4f electron configuration was prepared by a sol-gel process and characterized by Brunauer-Emmett-Teller method, X-ray diffraction, X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS), and also photoluminescence (PL) emission spectroscopy. The photocatalytic activity of Ce3+-TiO2 catalysts was evaluated in the 2-mercaptobenzothiazole (MBT) degradation in aqueous suspension under UV or visible light illumination. The experimental results demonstrated that the overall photocatalytic activity of Ce3+-TiO2 catalysts in MBT degradation was signigicantly enhanced due to higher adsorption capacity and better separation of electron-hole pairs. The experimental results verified that both the adsorption equilibrium constant (Ka) and the saturated adsorption amount (Γmax) increased with the increase of cerium ion content. The results of XPS analysis showed that the Ti 3+, Ce3+, and Ce4+ ions reside in the Ce 3+-TiO2 catalysts. The results of DRS analysis indicated that the Ce3+-TiO2 catalysts had significant optical absorption in the visible region between 400 and 500 nm because electrons could be excited from the valence band of TiO2 or ground state of cerium oxides to Ce 4f level. In the meantime, the dependence of the electron-hole pair separation on cerium ion content was investigated by the PL analysis. It was found that the separation efficiency of electron-hole pairs increased with the increase of cerium ion content at first and then decreased when the cerium ion content exceeded its optimal value. It is proposed that the formation of two sub-energy levels (defect level and Ce 4f level) in Ce3+-TiO 2 might be a critical reason to eliminate the recombination of electron-hole pairs and to enhance the photocatalytic activity. © 2005 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/155273
ISSN
2015 Impact Factor: 4.012
2015 SCImago Journal Rankings: 1.234
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, FBen_US
dc.contributor.authorLi, XZen_US
dc.contributor.authorHou, MFen_US
dc.contributor.authorCheah, KWen_US
dc.contributor.authorChoy, WCHen_US
dc.date.accessioned2012-08-08T08:32:39Z-
dc.date.available2012-08-08T08:32:39Z-
dc.date.issued2005en_US
dc.identifier.citationApplied Catalysis A: General, 2005, v. 285 n. 1-2, p. 181-189en_US
dc.identifier.issn0926-860Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/155273-
dc.description.abstractA series of cerium ion-doped titanium dioxide (Ce3+-TiO 2) catalysts with special 4f electron configuration was prepared by a sol-gel process and characterized by Brunauer-Emmett-Teller method, X-ray diffraction, X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS), and also photoluminescence (PL) emission spectroscopy. The photocatalytic activity of Ce3+-TiO2 catalysts was evaluated in the 2-mercaptobenzothiazole (MBT) degradation in aqueous suspension under UV or visible light illumination. The experimental results demonstrated that the overall photocatalytic activity of Ce3+-TiO2 catalysts in MBT degradation was signigicantly enhanced due to higher adsorption capacity and better separation of electron-hole pairs. The experimental results verified that both the adsorption equilibrium constant (Ka) and the saturated adsorption amount (Γmax) increased with the increase of cerium ion content. The results of XPS analysis showed that the Ti 3+, Ce3+, and Ce4+ ions reside in the Ce 3+-TiO2 catalysts. The results of DRS analysis indicated that the Ce3+-TiO2 catalysts had significant optical absorption in the visible region between 400 and 500 nm because electrons could be excited from the valence band of TiO2 or ground state of cerium oxides to Ce 4f level. In the meantime, the dependence of the electron-hole pair separation on cerium ion content was investigated by the PL analysis. It was found that the separation efficiency of electron-hole pairs increased with the increase of cerium ion content at first and then decreased when the cerium ion content exceeded its optimal value. It is proposed that the formation of two sub-energy levels (defect level and Ce 4f level) in Ce3+-TiO 2 might be a critical reason to eliminate the recombination of electron-hole pairs and to enhance the photocatalytic activity. © 2005 Elsevier B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/apcataen_US
dc.relation.ispartofApplied Catalysis A: Generalen_US
dc.subject2-Mercaptobenzothiazoleen_US
dc.subjectAdsorptionen_US
dc.subjectCerium Ionen_US
dc.subjectTitanium Dioxideen_US
dc.subjectVisible Lighten_US
dc.titleEnhanced photocatalytic activity of Ce3+-TiO2 for 2-mercaptobenzothiazole degradation in aqueous suspension for odour controlen_US
dc.typeArticleen_US
dc.identifier.emailChoy, WCH:chchoy@eee.hku.hken_US
dc.identifier.authorityChoy, WCH=rp00218en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.apcata.2005.02.025en_US
dc.identifier.scopuseid_2-s2.0-20344389277en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-20344389277&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume285en_US
dc.identifier.issue1-2en_US
dc.identifier.spage181en_US
dc.identifier.epage189en_US
dc.identifier.isiWOS:000229066500019-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridLi, FB=24484830300en_US
dc.identifier.scopusauthoridLi, XZ=8046503000en_US
dc.identifier.scopusauthoridHou, MF=7201437322en_US
dc.identifier.scopusauthoridCheah, KW=7102792922en_US
dc.identifier.scopusauthoridChoy, WCH=7006202371en_US

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