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Effective enhancement of the degradation of oxalic acid by catalytic ozonation with TiO2 by exposure of {001} facets and surface fluorination / Zhiqiao He in Industrial & engineering chemistry research, Vol. 51 N° 16 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 16 (Avril 2012) . - pp. 5662–5668 Titre : Effective enhancement of the degradation of oxalic acid by catalytic ozonation with TiO2 by exposure of {001} facets and surface fluorination Type de document : texte imprimé Auteurs : Zhiqiao He, Auteur ; Qiaolan Cai, Auteur ; Fangyue Hong, Auteur Année de publication : 2012 Article en page(s) : pp. 5662–5668 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Oxidation  Oxalic  acid  Catalytic  ozonation Résumé : Heterogeneous catalytic ozonation is a promising advanced oxidation technology for water treatment. In the present work, the surface fluorination of TiO2 catalysts with a high percentage of exposed {001} facets (F-TiO2) were synthesized through a hydrothermal method using tetrabutyl titanate as the precursor and HF as the shape controlling agent. The structural properties of the catalysts were characterized by X-ray diffraction, the Brunauer–Emmett–Teller method, field-emission scanning electron microscopy, and X-ray photoelectron spectroscopy. The sheetlike TiO2 is pure anatase, with 75% of highly reactive {001} facets. The surface fluoride of the F-TiO2 nanosheets can be removed by washing with dilute NaOH solution (abbreviated here as OH-TiO2), resulting in a decrease of Ti3+ content and an increase of the specific surface area. The catalytic activity of the samples was evaluated by degradation of oxalic acid in aqueous solution in the presence of ozone. It was found that F-TiO2 facilitated the catalytic ozonation process by comparison with OH-TiO2 and pure TiO2 nanoparticles prepared in pure water. We conclude that the high surface energies of {001} facets and the increased concentration of oxygen vacancies contributed to the enhancement of the ozonation activity of fluorinated TiO2 with dominant {001} facets. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202357d [article] Effective enhancement of the degradation of oxalic acid by catalytic ozonation with TiO2 by exposure of {001} facets and surface fluorination [texte imprimé] / Zhiqiao He, Auteur ; Qiaolan Cai, Auteur ; Fangyue Hong, Auteur . - 2012 . - pp. 5662–5668. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 16 (Avril 2012) . - pp. 5662–5668 Mots-clés : Oxidation  Oxalic  acid  Catalytic  ozonation Résumé : Heterogeneous catalytic ozonation is a promising advanced oxidation technology for water treatment. In the present work, the surface fluorination of TiO2 catalysts with a high percentage of exposed {001} facets (F-TiO2) were synthesized through a hydrothermal method using tetrabutyl titanate as the precursor and HF as the shape controlling agent. The structural properties of the catalysts were characterized by X-ray diffraction, the Brunauer–Emmett–Teller method, field-emission scanning electron microscopy, and X-ray photoelectron spectroscopy. The sheetlike TiO2 is pure anatase, with 75% of highly reactive {001} facets. The surface fluoride of the F-TiO2 nanosheets can be removed by washing with dilute NaOH solution (abbreviated here as OH-TiO2), resulting in a decrease of Ti3+ content and an increase of the specific surface area. The catalytic activity of the samples was evaluated by degradation of oxalic acid in aqueous solution in the presence of ozone. It was found that F-TiO2 facilitated the catalytic ozonation process by comparison with OH-TiO2 and pure TiO2 nanoparticles prepared in pure water. We conclude that the high surface energies of {001} facets and the increased concentration of oxygen vacancies contributed to the enhancement of the ozonation activity of fluorinated TiO2 with dominant {001} facets. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202357d