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Adsorption of copper acetate onto pretreated activated carbons over a wide concentration range / Amjad Farooq in Industrial & engineering chemistry research, Vol. 48 N° 22 (Novembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 9804–9808 Titre : Adsorption of copper acetate onto pretreated activated carbons over a wide concentration range Type de document : texte imprimé Auteurs : Amjad Farooq, Auteur ; Philippe Westreich, Auteur ; Naseem Irfan, Auteur Année de publication : 2010 Article en page(s) : pp. 9804–9808 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Copper  acetate  Microporous  activated  carbon Résumé : The commercially available microporous activated carbon Kuraray GC was pretreated in two different ways: one was heated to 950 °C in 5% hydrogen and the other boiled in nitric acid for 5 h. BET surface area measurements and Boehm titrations were done to find the surface area and the numbers of surface functional groups for each carbon. A large range of linearly varying concentrations of aqueous copper acetate solutions was made and stirred with each sample of pretreated carbon. Atomic absorption spectroscopy, titrations, and weight measurements were employed to measure the amount of copper acetate actually adsorbed onto the respective carbon samples. The number of acidic functional groups on the carbon surface as determined by Boehm titrations in the case of the hydrogen treated sample and the nitric acid treated sample do not match with the usual Langmuir parameters both at low and high concentrations. Two distinct isotherm fittings have been obtained for both carbons; double Langmuir isotherms for the hydrogen-treated sample, and a low concentration Langmuir isotherm combined with a high concentration Freundlich isotherm for the nitric acid treated sample. The results have also been compared with the results for untreated Kuraray GC. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900492f [article] Adsorption of copper acetate onto pretreated activated carbons over a wide concentration range [texte imprimé] / Amjad Farooq, Auteur ; Philippe Westreich, Auteur ; Naseem Irfan, Auteur . - 2010 . - pp. 9804–9808. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 9804–9808 Mots-clés : Copper  acetate  Microporous  activated  carbon Résumé : The commercially available microporous activated carbon Kuraray GC was pretreated in two different ways: one was heated to 950 °C in 5% hydrogen and the other boiled in nitric acid for 5 h. BET surface area measurements and Boehm titrations were done to find the surface area and the numbers of surface functional groups for each carbon. A large range of linearly varying concentrations of aqueous copper acetate solutions was made and stirred with each sample of pretreated carbon. Atomic absorption spectroscopy, titrations, and weight measurements were employed to measure the amount of copper acetate actually adsorbed onto the respective carbon samples. The number of acidic functional groups on the carbon surface as determined by Boehm titrations in the case of the hydrogen treated sample and the nitric acid treated sample do not match with the usual Langmuir parameters both at low and high concentrations. Two distinct isotherm fittings have been obtained for both carbons; double Langmuir isotherms for the hydrogen-treated sample, and a low concentration Langmuir isotherm combined with a high concentration Freundlich isotherm for the nitric acid treated sample. The results have also been compared with the results for untreated Kuraray GC. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900492f