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Batch removal of aqueous Cu2+ ions using nanoparticles of zero-valent iron / Duygu Karabelli in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4758–4764 Titre : Batch removal of aqueous Cu2+ ions using nanoparticles of zero-valent iron : a study of the capacity and mechanism of uptake Type de document : texte imprimé Auteurs : Duygu Karabelli, Auteur ; Çagri Üzüm, Auteur ; Talal Shahwan, Auteur ; Ahmet E. Eroglu, Auteur Année de publication : 2008 Article en page(s) : p. 4758–4764 Langues : Anglais (eng) Mots-clés : Cu2+  ions;  Zero-valent  iron;  X-ray  photoelectron  spectroscopy;  X-ray  diffraction Résumé : In this study, nZVI prepared by borohydride reduction was applied for the removal of Cu2+ ions under a variety of experimental conditions. The uptake experiments investigated the effects of initial concentration, contact time, pH, and repetitive loading on the extent of retardation of Cu2+ ions. Within the applied conditions, the sorbent demonstrated fast uptake kinetics and outstanding fixation abilities up to an initial Cu2+ concentration of 200.0 mg/L. Partitioning of Cu2+ ions between liquid and solid phases demonstrated an isotherm of L-type. Within the studied conditions, the capacity of uptake was found to be 250 mg of Cu2+ per g of nZVI. According to X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) results, Cu2+ ions were sorbed primarily via a redox mechanism that resulted in the formation of Cu2O and Cu0. The contact of iron nanoparticles with aqueous media caused extensive formation of iron oxide. However, the material did not completely lose its removal capacity and was repeatedly applied at low concentrations for further uptake trials. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800081s [article] Batch removal of aqueous Cu2+ ions using nanoparticles of zero-valent iron : a study of the capacity and mechanism of uptake [texte imprimé] / Duygu Karabelli, Auteur ; Çagri Üzüm, Auteur ; Talal Shahwan, Auteur ; Ahmet E. Eroglu, Auteur . - 2008 . - p. 4758–4764. Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4758–4764 Mots-clés : Cu2+  ions;  Zero-valent  iron;  X-ray  photoelectron  spectroscopy;  X-ray  diffraction Résumé : In this study, nZVI prepared by borohydride reduction was applied for the removal of Cu2+ ions under a variety of experimental conditions. The uptake experiments investigated the effects of initial concentration, contact time, pH, and repetitive loading on the extent of retardation of Cu2+ ions. Within the applied conditions, the sorbent demonstrated fast uptake kinetics and outstanding fixation abilities up to an initial Cu2+ concentration of 200.0 mg/L. Partitioning of Cu2+ ions between liquid and solid phases demonstrated an isotherm of L-type. Within the studied conditions, the capacity of uptake was found to be 250 mg of Cu2+ per g of nZVI. According to X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) results, Cu2+ ions were sorbed primarily via a redox mechanism that resulted in the formation of Cu2O and Cu0. The contact of iron nanoparticles with aqueous media caused extensive formation of iron oxide. However, the material did not completely lose its removal capacity and was repeatedly applied at low concentrations for further uptake trials. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800081s