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Elimination of the emerging contaminants amitriptyline hydrochloride, methyl salicylate, and 2-phenoxyethanol in ultrapure water and secondary effluents by photolytic and radicalary pathways / Francisco J. Real in Industrial & engineering chemistry research, Vol. 51 N° 50 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp. 16209-16215 Titre : Elimination of the emerging contaminants amitriptyline hydrochloride, methyl salicylate, and 2-phenoxyethanol in ultrapure water and secondary effluents by photolytic and radicalary pathways Type de document : texte imprimé Auteurs : Francisco J. Real, Auteur ; F. Javier Benitez, Auteur ; Juan L. Acero, Auteur Année de publication : 2013 Article en page(s) : pp. 16209-16215 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Ultrapure  water  High  purity  Pollution Résumé : Chemical degradation of the pharmaceuticals and personal care products (PPCPs) amitriptyline hydrochloride, methyl salicylate, and 2-phenoxyethanol by means of several advanced oxidation processes, including 254 nm UV radiation and Fenton's reagent, has been studied in different water matrixes, such as ultrapure (UP) and surface waters and two secondary effluents from wastewater treatment plants. The influence of the operating variables on the elimination of these compounds in UP water was established, and kinetic parameters for their degradation, such as quantum yields along a pH range of 3―11 and second-order rate constants for their oxidation by hydroxyl radicals, were determined. Specifically, for the reactions of oxidation of the three PPCPs with hydroxyl radicals, the use of a competition kinetic model in Fenton's reagent experiments allowed evaluation of their rate constants, whose values were (10.3 ± 0.3) × 109 M―1·s―1 for amitriptyline hydrochloride, (7.1 ± 0.1) × 109 M―1·s―1 for methyl salicylate, and (4.3 ± 0.1) × 109 M―1·s―1 for 2-phenoxyethanol. Furthermore, the simultaneous oxidation of these selected PPCPs in three different water systems (surface water from a reservoir and two secondary effluents) was studied, and the influence of the operating conditions on the removal efficiency was established. Finally, a kinetic model was proposed for the prediction of the elimination of these compounds by UV radiation and a UV/H2O2 system in these water matrixes, with theoretical results that agreed well with the experimental ones. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=2673214 [article] Elimination of the emerging contaminants amitriptyline hydrochloride, methyl salicylate, and 2-phenoxyethanol in ultrapure water and secondary effluents by photolytic and radicalary pathways [texte imprimé] / Francisco J. Real, Auteur ; F. Javier Benitez, Auteur ; Juan L. Acero, Auteur . - 2013 . - pp. 16209-16215. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp. 16209-16215 Mots-clés : Ultrapure  water  High  purity  Pollution Résumé : Chemical degradation of the pharmaceuticals and personal care products (PPCPs) amitriptyline hydrochloride, methyl salicylate, and 2-phenoxyethanol by means of several advanced oxidation processes, including 254 nm UV radiation and Fenton's reagent, has been studied in different water matrixes, such as ultrapure (UP) and surface waters and two secondary effluents from wastewater treatment plants. The influence of the operating variables on the elimination of these compounds in UP water was established, and kinetic parameters for their degradation, such as quantum yields along a pH range of 3―11 and second-order rate constants for their oxidation by hydroxyl radicals, were determined. Specifically, for the reactions of oxidation of the three PPCPs with hydroxyl radicals, the use of a competition kinetic model in Fenton's reagent experiments allowed evaluation of their rate constants, whose values were (10.3 ± 0.3) × 109 M―1·s―1 for amitriptyline hydrochloride, (7.1 ± 0.1) × 109 M―1·s―1 for methyl salicylate, and (4.3 ± 0.1) × 109 M―1·s―1 for 2-phenoxyethanol. Furthermore, the simultaneous oxidation of these selected PPCPs in three different water systems (surface water from a reservoir and two secondary effluents) was studied, and the influence of the operating conditions on the removal efficiency was established. Finally, a kinetic model was proposed for the prediction of the elimination of these compounds by UV radiation and a UV/H2O2 system in these water matrixes, with theoretical results that agreed well with the experimental ones. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=2673214

Kinetics of the chemical oxidation of the pharmaceuticals primidone, ketoprofen, and diatrizoate in ultrapure and natural waters / Francisco J. Real in Industrial & engineering chemistry research, Vol. 48 N° 7 (Avril 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3380–3388 Titre : Kinetics of the chemical oxidation of the pharmaceuticals primidone, ketoprofen, and diatrizoate in ultrapure and natural waters Type de document : texte imprimé Auteurs : Francisco J. Real, Auteur ; F. Javier Benitez, Auteur ; Juan L. Acero, Auteur Année de publication : 2009 Article en page(s) : pp. 3380–3388 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Oxidation  processes  Oxidation  systems  Kinetic  model  Natural  water  systems Résumé : Oxidation of three pharmaceuticals (primidone, ketoprofen, and diatrizoate sodium) by means of several advanced oxidation processes including such as ozonation, UV radiation, and Fenton’s reagent has been studied. The influence of operating variables was established, and first-order rate constants were determined in most of the oxidation systems. Specifically, for the reactions with ozone, the following rate constants were obtained by means of a competition kinetic model: 1.0 ± 0.1, 0.40 ± 0.07, and 0.05 ± 0.01 M−1·s−1, for primidone, ketoprofen, and diatrizoate, respectively. The results showed that reaction with OH radicals was the major pathway for the oxidative transformation of these compounds. In the photodegradation experiments by 254 nm radiation, the quantum yields were also determined for every compound at different pH and temperatures. Additionally, the competition kinetic model, which was also used in Fenton’s reagent experiments, allowed to evaluate the rate constants for the reaction with hydroxyl radicals whose values were the following: (6.7 ± 0.2) × 109 M−1·s−1 for primidone, (8.4 ± 0.3) × 109 M−1·s−1 for ketoprofen, and (5.4 ± 0.3) × 108 M−1·s−1 for diatrizoate. Furthermore, the simultaneous oxidation of these selected pharmaceuticals in some natural water systems (a commercial mineral water, a groundwater, and surface water from a reservoir) was studied. The influence of the operating conditions on the removal efficiency was established. Finally, a kinetic model was proposed for the prediction of the elimination of the selected pharmaceuticals by ozone in these natural waters, with theoretical results that agreed well with the experimental ones. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801762p [article] Kinetics of the chemical oxidation of the pharmaceuticals primidone, ketoprofen, and diatrizoate in ultrapure and natural waters [texte imprimé] / Francisco J. Real, Auteur ; F. Javier Benitez, Auteur ; Juan L. Acero, Auteur . - 2009 . - pp. 3380–3388. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3380–3388 Mots-clés : Oxidation  processes  Oxidation  systems  Kinetic  model  Natural  water  systems Résumé : Oxidation of three pharmaceuticals (primidone, ketoprofen, and diatrizoate sodium) by means of several advanced oxidation processes including such as ozonation, UV radiation, and Fenton’s reagent has been studied. The influence of operating variables was established, and first-order rate constants were determined in most of the oxidation systems. Specifically, for the reactions with ozone, the following rate constants were obtained by means of a competition kinetic model: 1.0 ± 0.1, 0.40 ± 0.07, and 0.05 ± 0.01 M−1·s−1, for primidone, ketoprofen, and diatrizoate, respectively. The results showed that reaction with OH radicals was the major pathway for the oxidative transformation of these compounds. In the photodegradation experiments by 254 nm radiation, the quantum yields were also determined for every compound at different pH and temperatures. Additionally, the competition kinetic model, which was also used in Fenton’s reagent experiments, allowed to evaluate the rate constants for the reaction with hydroxyl radicals whose values were the following: (6.7 ± 0.2) × 109 M−1·s−1 for primidone, (8.4 ± 0.3) × 109 M−1·s−1 for ketoprofen, and (5.4 ± 0.3) × 108 M−1·s−1 for diatrizoate. Furthermore, the simultaneous oxidation of these selected pharmaceuticals in some natural water systems (a commercial mineral water, a groundwater, and surface water from a reservoir) was studied. The influence of the operating conditions on the removal efficiency was established. Finally, a kinetic model was proposed for the prediction of the elimination of the selected pharmaceuticals by ozone in these natural waters, with theoretical results that agreed well with the experimental ones. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801762p