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Novel polycarboxylated starch-Bbased sorbents for Cu2+ ions / Kalpana Chauhan in Industrial & engineering chemistry research, Vol. 49 N° 6 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2548–2556 Titre : Novel polycarboxylated starch-Bbased sorbents for Cu2+ ions Type de document : texte imprimé Auteurs : Kalpana Chauhan, Auteur ; Ghanshyam S. Chauhan, Auteur ; J. H. Ahn, Auteur Année de publication : 2010 Article en page(s) : pp. 2548–2556 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Sorbents  Polycarboxylated  Starch  Cu2+  Ions Résumé : In this article we report use of novel starch-based functional hydrogels as Cu2+ ions sorbents. Starch was functionalized by acid hydrolysis and/or oxidized by nitrogen oxides to generate carboxylic groups at C-6. Sorption of Cu2+ ions was studied as a function of hydrogel structure and environmental factors. Hydrogels exhibit structure−property relationship in the sorption of Cu2+ ions. The hydrogel that exhibited the maximum ion uptake was used to investigate the effect of contact time, temperature, pH, and Cu2+ ions concentration on the sorption capacity. The maximum sorption capacity of 128.26 mg g−1 was obtained in 2 h at 40 °C, 7.0 pH, and 50 ppm of Cu2+ ions. Sorption data show good match both with Langmuir and Freundlich isotherms and obey pseudo-second-order kinetics. Cu2+ ions bind to sorbents by chelation. Evidence of Cu2+ uptake on hydrogels was obtained from FTIR spectrum of the ions-loaded hydrogel. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9009952 [article] Novel polycarboxylated starch-Bbased sorbents for Cu2+ ions [texte imprimé] / Kalpana Chauhan, Auteur ; Ghanshyam S. Chauhan, Auteur ; J. H. Ahn, Auteur . - 2010 . - pp. 2548–2556. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2548–2556 Mots-clés : Sorbents  Polycarboxylated  Starch  Cu2+  Ions Résumé : In this article we report use of novel starch-based functional hydrogels as Cu2+ ions sorbents. Starch was functionalized by acid hydrolysis and/or oxidized by nitrogen oxides to generate carboxylic groups at C-6. Sorption of Cu2+ ions was studied as a function of hydrogel structure and environmental factors. Hydrogels exhibit structure−property relationship in the sorption of Cu2+ ions. The hydrogel that exhibited the maximum ion uptake was used to investigate the effect of contact time, temperature, pH, and Cu2+ ions concentration on the sorption capacity. The maximum sorption capacity of 128.26 mg g−1 was obtained in 2 h at 40 °C, 7.0 pH, and 50 ppm of Cu2+ ions. Sorption data show good match both with Langmuir and Freundlich isotherms and obey pseudo-second-order kinetics. Cu2+ ions bind to sorbents by chelation. Evidence of Cu2+ uptake on hydrogels was obtained from FTIR spectrum of the ions-loaded hydrogel. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9009952