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Effect of Fe(III) / citrate concentrations and ratio on the photoproduction of hydroxyl radicals / Xiaonan Feng in Industrial & engineering chemistry research, Vol. 51 N° 20 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 20 (Mai 2012) . - pp. 7007–7012 Titre : Effect of Fe(III) / citrate concentrations and ratio on the photoproduction of hydroxyl radicals : Application on the degradation of diphenhydramine Type de document : texte imprimé Auteurs : Xiaonan Feng, Auteur ; Zongping Wang, Auteur ; Chen, Yong, Auteur Année de publication : 2012 Article en page(s) : pp. 7007–7012 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Hydroxyl  radicals  Diphenhydramine Résumé : Fe(III)-citrate complexes are photoreactive and ubiquitous in natural waters. In this study, the effect of Fe(III)/citrate concentrations and ratio on the photoproduction of •OH as a function of pH (3–9) was systematically investigated. The •OH formation mechanism was elucidated according to the pH-dependent formation rate of •OH and the speciation distribution analysis of Fe(III) species. At high Fe(III)-to-citrate ratio (10:50), the •OH photoproduction increased with decreasing pH. In contrast, the •OH photoproduction increased in the order of pH 9.0 < 3.0 < 7.0 < 6.0 < 5.0 at low Fe(III)-to-citrate ratios (10:100–10:300). At identical Fe(III)-to-citrate ratio (1:10), high concentration of Fe(III)-citrate complexes rendered a downward trend for •OH production with increasing pH. FeOHcit– is the predominant reactive species responsible for the •OH formation at high pH. The optimal pH for •OH production was governed by the amount of O2• – and the stability of Fe(II) species in the Fe(III)-cit solution. The Fe(III)-cit-induced photodegradation of diphenhydramine verified the pH-dependent trend for •OH production. By GC-MS and LC-ESI-MS analyses, the photoproducts of diphenhydramine were identified and the degradation pathway was proposed. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300360p [article] Effect of Fe(III) / citrate concentrations and ratio on the photoproduction of hydroxyl radicals : Application on the degradation of diphenhydramine [texte imprimé] / Xiaonan Feng, Auteur ; Zongping Wang, Auteur ; Chen, Yong, Auteur . - 2012 . - pp. 7007–7012. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 20 (Mai 2012) . - pp. 7007–7012 Mots-clés : Hydroxyl  radicals  Diphenhydramine Résumé : Fe(III)-citrate complexes are photoreactive and ubiquitous in natural waters. In this study, the effect of Fe(III)/citrate concentrations and ratio on the photoproduction of •OH as a function of pH (3–9) was systematically investigated. The •OH formation mechanism was elucidated according to the pH-dependent formation rate of •OH and the speciation distribution analysis of Fe(III) species. At high Fe(III)-to-citrate ratio (10:50), the •OH photoproduction increased with decreasing pH. In contrast, the •OH photoproduction increased in the order of pH 9.0 < 3.0 < 7.0 < 6.0 < 5.0 at low Fe(III)-to-citrate ratios (10:100–10:300). At identical Fe(III)-to-citrate ratio (1:10), high concentration of Fe(III)-citrate complexes rendered a downward trend for •OH production with increasing pH. FeOHcit– is the predominant reactive species responsible for the •OH formation at high pH. The optimal pH for •OH production was governed by the amount of O2• – and the stability of Fe(II) species in the Fe(III)-cit solution. The Fe(III)-cit-induced photodegradation of diphenhydramine verified the pH-dependent trend for •OH production. By GC-MS and LC-ESI-MS analyses, the photoproducts of diphenhydramine were identified and the degradation pathway was proposed. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300360p