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Effect of bulk temperature and frequency on the sonolytic degradation of 1,4-dioxane with Fe0 / Hyun-Seok Son in Industrial & engineering chemistry research, Vol. 50 N° 9 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5394–5400 Titre : Effect of bulk temperature and frequency on the sonolytic degradation of 1,4-dioxane with Fe0 Type de document : texte imprimé Auteurs : Hyun-Seok Son, Auteur ; Sung-Keun Kim, Auteur ; Jong-Kwon Im, Auteur Année de publication : 2011 Article en page(s) : pp. 5394–5400 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Sonolytic  degradation Résumé : The sonolysis of 1,4-dioxane in the absence and the presence of zero-valent iron (Fe0) was investigated by altering bulk temperature and ultrasonic frequency conditions. In the absence of Fe0, the sonolytic degradation efficiency of 1,4-dioxane was higher at 170 kHz as compared to that at 35 kHz. As bulk temperature increased, sononlytic degradation efficiency of 1,4-dioxane decreased at both frequencies; however, the rate decrease by the increase in temperature was smaller at 170 kHz than at 35 kHz. Adding methanol as a radical scavenger remarkably decreased the sonolytic degradation rate at 170 kHz within 60 min in all bulk temperatures. In contrast, the decrease in the degradation rate by adding methanol at 35 kHz was observed after 60 min only at 10 °C, but not at 20 and 30 °C. These results indicate that both bulk temperature and sonication frequency should be considered to optimize the sonolytic degradation. The degradation efficiency was significantly enhanced in the presence of Fe0 especially at 170 kHz, indicating that Fe0 can facilitate hydroxyl radical production by Fenton-type reaction mechanism during sonication. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101849p [article] Effect of bulk temperature and frequency on the sonolytic degradation of 1,4-dioxane with Fe0 [texte imprimé] / Hyun-Seok Son, Auteur ; Sung-Keun Kim, Auteur ; Jong-Kwon Im, Auteur . - 2011 . - pp. 5394–5400. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5394–5400 Mots-clés : Sonolytic  degradation Résumé : The sonolysis of 1,4-dioxane in the absence and the presence of zero-valent iron (Fe0) was investigated by altering bulk temperature and ultrasonic frequency conditions. In the absence of Fe0, the sonolytic degradation efficiency of 1,4-dioxane was higher at 170 kHz as compared to that at 35 kHz. As bulk temperature increased, sononlytic degradation efficiency of 1,4-dioxane decreased at both frequencies; however, the rate decrease by the increase in temperature was smaller at 170 kHz than at 35 kHz. Adding methanol as a radical scavenger remarkably decreased the sonolytic degradation rate at 170 kHz within 60 min in all bulk temperatures. In contrast, the decrease in the degradation rate by adding methanol at 35 kHz was observed after 60 min only at 10 °C, but not at 20 and 30 °C. These results indicate that both bulk temperature and sonication frequency should be considered to optimize the sonolytic degradation. The degradation efficiency was significantly enhanced in the presence of Fe0 especially at 170 kHz, indicating that Fe0 can facilitate hydroxyl radical production by Fenton-type reaction mechanism during sonication. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101849p

Effects of methanol and carbon tetrachloride on sonolysis of 1,4 - dioxane in relation to temperature / Hyun-Seok Son in Industrial & engineering chemistry research, Vol. 51 N° 26 (Juillet 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 26 (Juillet 2012) . - pp. 8939-8944 Titre : Effects of methanol and carbon tetrachloride on sonolysis of 1,4 - dioxane in relation to temperature Type de document : texte imprimé Auteurs : Hyun-Seok Son, Auteur ; Kyung-Duk Zoh, Auteur Année de publication : 2012 Article en page(s) : pp. 8939-8944 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Sonolysis Résumé : The effects of methanol and carbon tetrachloride (CT) on the degradation of 1,4-dioxane via ultrasound irradiation were investigated by estimating the production rate of H2O2 and the degradation efficiency of the substrates. At 5 and 20 °C, the production rate of H2O2 significantly decreased as methanol concentration in pure water increased and during sonolysis of 1,4-dixoane. The sonolytic efficiency of 1,4-dioxane with methanol greatly decreased over 60 min at 5 °C and 90 min at 20 °C. Production of H2O2 increased during CT sonolysis at 5 °C but decreased at 20 and 40 °C, with efficiency greatest at 5 °C. Sonolysis of 1,4-dioxane with CT was enhanced from the beginning reaction at 5 °C and 40 min at 20 °C compared to the reactions without CT but was slightly lower at 40 °C. The results elucidate sonolytic mechanisms, such as pyrolysis and redox, in relation to reaction temperature, as well as suggest sonolytic conditions for the effective degradation of CT and 1,4-dioxane. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26107449 [article] Effects of methanol and carbon tetrachloride on sonolysis of 1,4 - dioxane in relation to temperature [texte imprimé] / Hyun-Seok Son, Auteur ; Kyung-Duk Zoh, Auteur . - 2012 . - pp. 8939-8944. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 26 (Juillet 2012) . - pp. 8939-8944 Mots-clés : Sonolysis Résumé : The effects of methanol and carbon tetrachloride (CT) on the degradation of 1,4-dioxane via ultrasound irradiation were investigated by estimating the production rate of H2O2 and the degradation efficiency of the substrates. At 5 and 20 °C, the production rate of H2O2 significantly decreased as methanol concentration in pure water increased and during sonolysis of 1,4-dixoane. The sonolytic efficiency of 1,4-dioxane with methanol greatly decreased over 60 min at 5 °C and 90 min at 20 °C. Production of H2O2 increased during CT sonolysis at 5 °C but decreased at 20 and 40 °C, with efficiency greatest at 5 °C. Sonolysis of 1,4-dioxane with CT was enhanced from the beginning reaction at 5 °C and 40 min at 20 °C compared to the reactions without CT but was slightly lower at 40 °C. The results elucidate sonolytic mechanisms, such as pyrolysis and redox, in relation to reaction temperature, as well as suggest sonolytic conditions for the effective degradation of CT and 1,4-dioxane. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26107449