Documents disponibles écrits par cet auteur

Photochemical degradation of 2,4,6-trichlorophenol in the brij 35 micellar solution / W. Chu in Industrial & engineering chemistry research, Vol. 48 N° 23 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10211–10216 Titre : Photochemical degradation of 2,4,6-trichlorophenol in the brij 35 micellar solution : pH control on product distribution Type de document : texte imprimé Auteurs : W. Chu, Auteur ; Y. F. Rao, Auteur ; C. Y. Kwan, Auteur Année de publication : 2010 Article en page(s) : pp. 10211–10216 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Photochemical--Degradation--Trichlorophenol--Brij  35  Micellar--Solution--pH  Control--Product  Distribution Résumé : Surfactants have been used for separating organic pollutants from contaminated soils in soil-washing process. The extracted pollutants can be effectively degraded upon UV irradiation in the presence of surfactant micelles. The photodecay rate of 2,4,6-trichlorophenol (2,4,6-TCP) by UV light at 253.7 nm and photonic efficiency of 2,4,6-TCP degradation reaction were investigated at different pH levels with the addition of nonionic surfactant solutions above the critical micelle concentration (cmc). A continual examination on intermediates at all pHs was conducted and photochemical processes induced the dechlorination of TCP to form di- and monochlorinated intermediates and phenol. An additional reaction was observed when the initial pH level was above neutral, at which chlorinated hydroquinones were the resulting intermediates through photohydrolysis process. Two reaction mechanisms, one at acidic and the other at basic conditions, were proposed and verified by the evidence presented in this study. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9003943 [article] Photochemical degradation of 2,4,6-trichlorophenol in the brij 35 micellar solution : pH control on product distribution [texte imprimé] / W. Chu, Auteur ; Y. F. Rao, Auteur ; C. Y. Kwan, Auteur . - 2010 . - pp. 10211–10216. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10211–10216 Mots-clés : Photochemical--Degradation--Trichlorophenol--Brij  35  Micellar--Solution--pH  Control--Product  Distribution Résumé : Surfactants have been used for separating organic pollutants from contaminated soils in soil-washing process. The extracted pollutants can be effectively degraded upon UV irradiation in the presence of surfactant micelles. The photodecay rate of 2,4,6-trichlorophenol (2,4,6-TCP) by UV light at 253.7 nm and photonic efficiency of 2,4,6-TCP degradation reaction were investigated at different pH levels with the addition of nonionic surfactant solutions above the critical micelle concentration (cmc). A continual examination on intermediates at all pHs was conducted and photochemical processes induced the dechlorination of TCP to form di- and monochlorinated intermediates and phenol. An additional reaction was observed when the initial pH level was above neutral, at which chlorinated hydroquinones were the resulting intermediates through photohydrolysis process. Two reaction mechanisms, one at acidic and the other at basic conditions, were proposed and verified by the evidence presented in this study. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9003943