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Photodegradation of estrone in solar irradiation / Rajib Roy Chowdhury in Industrial & engineering chemistry research, Vol. 49 N° 15 (Août 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 6923–6930 Titre : Photodegradation of estrone in solar irradiation Type de document : texte imprimé Auteurs : Rajib Roy Chowdhury, Auteur ; Paul Charpentier, Auteur ; Madhumita B. Ray, Auteur Année de publication : 2010 Article en page(s) : pp 6923–6930 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Photodegradation  Solar  Irradiation. Résumé : The photodegradation of the steroid estrone (E1), an endocrine disrupting hormone which is commonly released into aquatic environments, was investigated in aqueous solution using natural sunlight (290−700 nm) produced using a solar simulator. The degradation of E1 was found to follow pseudo-first-order kinetics, with the rate constant decreasing slightly with increasing initial concentration and varying linearly with solar intensity in the region of 25−100 mW cm−2. The half-life of E1 using 1 Sun (100 mW cm−2) was measured to be 52.50 min in natural conditions. The rate of mineralization based on total organic carbon (TOC) reduction was lower than E1 degradation, while the TOC of the solution decreased steadily with increased irradiation time. In the presence of humic acid, the photodegradation rate increased significantly, attributed to photosensitization by the reactive species. The solution pH also had a considerable effect on the rate with maximum degradation occurring around neutral pH of 7. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901796x [article] Photodegradation of estrone in solar irradiation [texte imprimé] / Rajib Roy Chowdhury, Auteur ; Paul Charpentier, Auteur ; Madhumita B. Ray, Auteur . - 2010 . - pp 6923–6930. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 6923–6930 Mots-clés : Photodegradation  Solar  Irradiation. Résumé : The photodegradation of the steroid estrone (E1), an endocrine disrupting hormone which is commonly released into aquatic environments, was investigated in aqueous solution using natural sunlight (290−700 nm) produced using a solar simulator. The degradation of E1 was found to follow pseudo-first-order kinetics, with the rate constant decreasing slightly with increasing initial concentration and varying linearly with solar intensity in the region of 25−100 mW cm−2. The half-life of E1 using 1 Sun (100 mW cm−2) was measured to be 52.50 min in natural conditions. The rate of mineralization based on total organic carbon (TOC) reduction was lower than E1 degradation, while the TOC of the solution decreased steadily with increased irradiation time. In the presence of humic acid, the photodegradation rate increased significantly, attributed to photosensitization by the reactive species. The solution pH also had a considerable effect on the rate with maximum degradation occurring around neutral pH of 7. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901796x