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Kinetic studies on black light photocatalytic ozonation of diclofenac and sulfamethoxazole in water / Fernando J. Beltran in Industrial & engineering chemistry research, Vol. 51 N° 12 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 12 (Mars 2012) . - pp. 4533–4544 Titre : Kinetic studies on black light photocatalytic ozonation of diclofenac and sulfamethoxazole in water Type de document : texte imprimé Auteurs : Fernando J. Beltran, Auteur ; Almudena Aguinaco, Auteur ; Ana Rey, Auteur Année de publication : 2012 Article en page(s) : pp. 4533–4544 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Kinetic  Photocatalytic  ozonation Résumé : Black light photocatalytic ozonation of two pharmaceutical compounds, sulfamethoxazole (SMX) and diclofenac (DCF), and the resulting total organic carbon (TOC) are studied. DCF and SMX removals from some mg·L–1 to 100 μg·L–1 are achieved in approximately 7 and 15 min ozonation, respectively, regardless of the ozone process, while the resulting TOC is eliminated via hydroxyl radical reactions. For initial concentrations lower than 50 μg·L–1, competition between direct ozonation and hydroxyl radical oxidation to eliminate SMX and DCF takes place. The initial reaction period for cases of high and low concentration is simulated through fast-moderate and slow gas–liquid second order reaction kinetics, respectively. For high starting concentrations the calculated results suggest the presence of ozone fast reacting intermediates. For low starting concentration, calculated results indicate the importance of hydroxyl radical oxidation and the synergic effect of ozone and photocatalytic oxidation. Kinetic data of TOC ozonation, photocatalytic oxidation, and photocatalytic ozonation are also presented. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202525f [article] Kinetic studies on black light photocatalytic ozonation of diclofenac and sulfamethoxazole in water [texte imprimé] / Fernando J. Beltran, Auteur ; Almudena Aguinaco, Auteur ; Ana Rey, Auteur . - 2012 . - pp. 4533–4544. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 12 (Mars 2012) . - pp. 4533–4544 Mots-clés : Kinetic  Photocatalytic  ozonation Résumé : Black light photocatalytic ozonation of two pharmaceutical compounds, sulfamethoxazole (SMX) and diclofenac (DCF), and the resulting total organic carbon (TOC) are studied. DCF and SMX removals from some mg·L–1 to 100 μg·L–1 are achieved in approximately 7 and 15 min ozonation, respectively, regardless of the ozone process, while the resulting TOC is eliminated via hydroxyl radical reactions. For initial concentrations lower than 50 μg·L–1, competition between direct ozonation and hydroxyl radical oxidation to eliminate SMX and DCF takes place. The initial reaction period for cases of high and low concentration is simulated through fast-moderate and slow gas–liquid second order reaction kinetics, respectively. For high starting concentrations the calculated results suggest the presence of ozone fast reacting intermediates. For low starting concentration, calculated results indicate the importance of hydroxyl radical oxidation and the synergic effect of ozone and photocatalytic oxidation. Kinetic data of TOC ozonation, photocatalytic oxidation, and photocatalytic ozonation are also presented. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202525f

Role of the Activated Carbon Surface on Catalytic Wet Peroxide Oxidation / Ana Rey in Industrial & engineering chemistry research, Vol. 47 n°21 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8166–8174 Titre : Role of the Activated Carbon Surface on Catalytic Wet Peroxide Oxidation Type de document : texte imprimé Auteurs : Ana Rey, Auteur ; Marisol Faraldos, Auteur ; Ana Bahamonde, Auteur Année de publication : 2008 Article en page(s) : p. 8166–8174 Note générale : chemical engineering Langues : Anglais (eng) Mots-clés : Activated  carbonsCatalytst  characterization Résumé : Three activated carbons with fairly different characteristics have been checked in catalytic wet peroxide oxidation (CWPO) using phenol as a model compound for the purpose of learning the role of these materials which can be used as supports for the preparation of Fe or other metallic catalysts. A complex contribution of mixed effects is involved making difficult to predict the behavior of a given activated carbon. The surface of these materials promotes the undesirable decomposition of H2O2 to unreactive O2 instead of •OH radicals in an extent depending on the nature and accessibility of the oxygen groups. A frankly basic surface including groups such as pyrone with an egg-shell type distribution on the carbon particle seems to be beneficial for a more effective decomposition of H2O2 leading to a higher oxidation activity. The presence of iron in the activated carbon ashes is also an important factor which may hide in part other effects derived from the structure and surface composition of the carbon. However, that factor cannot explain by itself the differences found in the behavior of the activated carbons since two of them with a similar Fe content showed markedly different activities in CWPO of phenol. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800538t [article] Role of the Activated Carbon Surface on Catalytic Wet Peroxide Oxidation [texte imprimé] / Ana Rey, Auteur ; Marisol Faraldos, Auteur ; Ana Bahamonde, Auteur . - 2008 . - p. 8166–8174. chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8166–8174 Mots-clés : Activated  carbonsCatalytst  characterization Résumé : Three activated carbons with fairly different characteristics have been checked in catalytic wet peroxide oxidation (CWPO) using phenol as a model compound for the purpose of learning the role of these materials which can be used as supports for the preparation of Fe or other metallic catalysts. A complex contribution of mixed effects is involved making difficult to predict the behavior of a given activated carbon. The surface of these materials promotes the undesirable decomposition of H2O2 to unreactive O2 instead of •OH radicals in an extent depending on the nature and accessibility of the oxygen groups. A frankly basic surface including groups such as pyrone with an egg-shell type distribution on the carbon particle seems to be beneficial for a more effective decomposition of H2O2 leading to a higher oxidation activity. The presence of iron in the activated carbon ashes is also an important factor which may hide in part other effects derived from the structure and surface composition of the carbon. However, that factor cannot explain by itself the differences found in the behavior of the activated carbons since two of them with a similar Fe content showed markedly different activities in CWPO of phenol. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800538t