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Article: Solar photocatalytic degradation of gaseous formaldehyde by sol-gel TiO2 thin film for enhancement of indoor air quality

TitleSolar photocatalytic degradation of gaseous formaldehyde by sol-gel TiO2 thin film for enhancement of indoor air quality
Authors
KeywordsPhotocatalytic
Photoreactor
Sol-gel
Solar
Issue Date2004
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/solener
Citation
Solar Energy, 2004, v. 77 n. 2, p. 129-135 How to Cite?
AbstractSolar photocatalytic degradation of formaldehyde in the gaseous phase has been investigated. The tested photoreactor is made of a borosilicate glass tube with the inner surface coated with a sol-gel TiO2 thin film. In a pseudo-first-order Langmuir-Hinshelwood (L-H) model, the maximum reaction rate constant obtained is 0.148 min-1 under an exposure to sunlight with solar UVA irradiance of 1.56 mW/cm2. The solar photolysis effect is found to be negligible. It is also found that the sol-gel TiO2 thin film has a lower apparent photonic efficiency of solar photocatalysis than a Degussa P25 TiO2 coating. However, for the photonic efficiency taking into account the absorbed and scattered photons only and, in other words, excluding the transmitted photons, the thin film has a higher value. Based on a total of 28 measured data, an empirical-correlation equation has been developed to express the reactant residue with respect to the solar UVA irradiance and exposure time. A reasonable agreement between the correlation and experimental data is obtained. The findings of this investigation can be applied to design optimization of a honeycomb photoreactor made up of TiO2-coated glass tubes or polygonal cells. © 2004 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/156814
ISSN
2015 Impact Factor: 3.685
2015 SCImago Journal Rankings: 2.063
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChing, WHen_HK
dc.contributor.authorLeung, Men_HK
dc.contributor.authorLeung, DYCen_HK
dc.date.accessioned2012-08-08T08:44:05Z-
dc.date.available2012-08-08T08:44:05Z-
dc.date.issued2004en_HK
dc.identifier.citationSolar Energy, 2004, v. 77 n. 2, p. 129-135en_HK
dc.identifier.issn0038-092Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/156814-
dc.description.abstractSolar photocatalytic degradation of formaldehyde in the gaseous phase has been investigated. The tested photoreactor is made of a borosilicate glass tube with the inner surface coated with a sol-gel TiO2 thin film. In a pseudo-first-order Langmuir-Hinshelwood (L-H) model, the maximum reaction rate constant obtained is 0.148 min-1 under an exposure to sunlight with solar UVA irradiance of 1.56 mW/cm2. The solar photolysis effect is found to be negligible. It is also found that the sol-gel TiO2 thin film has a lower apparent photonic efficiency of solar photocatalysis than a Degussa P25 TiO2 coating. However, for the photonic efficiency taking into account the absorbed and scattered photons only and, in other words, excluding the transmitted photons, the thin film has a higher value. Based on a total of 28 measured data, an empirical-correlation equation has been developed to express the reactant residue with respect to the solar UVA irradiance and exposure time. A reasonable agreement between the correlation and experimental data is obtained. The findings of this investigation can be applied to design optimization of a honeycomb photoreactor made up of TiO2-coated glass tubes or polygonal cells. © 2004 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/soleneren_HK
dc.relation.ispartofSolar Energyen_HK
dc.subjectPhotocatalyticen_HK
dc.subjectPhotoreactoren_HK
dc.subjectSol-gelen_HK
dc.subjectSolaren_HK
dc.titleSolar photocatalytic degradation of gaseous formaldehyde by sol-gel TiO2 thin film for enhancement of indoor air qualityen_HK
dc.typeArticleen_HK
dc.identifier.emailLeung, MKH: mkhleung@hkucc.hku.hken_HK
dc.identifier.emailLeung, DYC: ycleung@hku.hken_HK
dc.identifier.authorityLeung, M=rp00148en_HK
dc.identifier.authorityLeung, DYC=rp00149en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.solener.2004.05.012en_HK
dc.identifier.scopuseid_2-s2.0-3142766914en_HK
dc.identifier.hkuros91355-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-3142766914&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume77en_HK
dc.identifier.issue2en_HK
dc.identifier.spage129en_HK
dc.identifier.epage135en_HK
dc.identifier.isiWOS:000223477100001-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridChing, WH=36889478500en_HK
dc.identifier.scopusauthoridLeung, M=8862966600en_HK
dc.identifier.scopusauthoridLeung, DYC=7203002484en_HK

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