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Investigation of physicochemical parameters that influence photocatalytic degradation of methyl orange over TiO2 nanotubes / York R. Smith in Industrial & engineering chemistry research, Vol. 48 N° 23 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10268–10276 Titre : Investigation of physicochemical parameters that influence photocatalytic degradation of methyl orange over TiO2 nanotubes Type de document : texte imprimé Auteurs : York R. Smith, Auteur ; Archana Kar, Auteur ; Vaidyanathan (Ravi) Subramanian, Auteur Année de publication : 2010 Article en page(s) : pp. 10268–10276 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Investigation--Physicochemical--Parameters--Influence--Photocatalytic--Degradation--Methyl--Orange--TiO2  Nanotubes Résumé : The photocatalytic degradation of a model textile dye, methyl orange (MO), using anodized titanium dioxide (TiO2) nanotubes has been investigated. The effects of light intensity, dye concentration, external bias, pH, and nanotube dimensions (length, diameter, and wall thickness) on MO photodegradation have been examined. The application of a minimal bias of +0.0 versus saturated calomel electrode (SCE) can enhance the dye degradation at least 10 times compared to unbiased conditions for dye concentrations between 20 and 100 μM. The overall initial dye degradation rate demonstrates three types of dependence on dye concentration over a range from 2.5−100 μM. For lower dye concentrations (2.5−40 μM) and natural pH (∼6.0) conditions, Langmuir−Hinshelwood (LH) kinetics was observed. The nanotubes diameter, calcination condition, and the anatase-to-rutile ratio in the crystalline TiO2 nanotubes together influence the photocatalytic and photoelectrochemical properties of the TiO2 nanotubes. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801851p [article] Investigation of physicochemical parameters that influence photocatalytic degradation of methyl orange over TiO2 nanotubes [texte imprimé] / York R. Smith, Auteur ; Archana Kar, Auteur ; Vaidyanathan (Ravi) Subramanian, Auteur . - 2010 . - pp. 10268–10276. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10268–10276 Mots-clés : Investigation--Physicochemical--Parameters--Influence--Photocatalytic--Degradation--Methyl--Orange--TiO2  Nanotubes Résumé : The photocatalytic degradation of a model textile dye, methyl orange (MO), using anodized titanium dioxide (TiO2) nanotubes has been investigated. The effects of light intensity, dye concentration, external bias, pH, and nanotube dimensions (length, diameter, and wall thickness) on MO photodegradation have been examined. The application of a minimal bias of +0.0 versus saturated calomel electrode (SCE) can enhance the dye degradation at least 10 times compared to unbiased conditions for dye concentrations between 20 and 100 μM. The overall initial dye degradation rate demonstrates three types of dependence on dye concentration over a range from 2.5−100 μM. For lower dye concentrations (2.5−40 μM) and natural pH (∼6.0) conditions, Langmuir−Hinshelwood (LH) kinetics was observed. The nanotubes diameter, calcination condition, and the anatase-to-rutile ratio in the crystalline TiO2 nanotubes together influence the photocatalytic and photoelectrochemical properties of the TiO2 nanotubes. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801851p