Polymer structure and metal ion selectivity in silica polyamine composites modified with sodium chloroacetate and nitriloacetic acid (NTA) anhydride / Mark A. Hughes in Industrial & engineering chemistry research, Vol. 47 N°17 (Septembre 2008)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6765–6774 Titre : Polymer structure and metal ion selectivity in silica polyamine composites modified with sodium chloroacetate and nitriloacetic acid (NTA) anhydride Type de document : texte imprimé Auteurs : Mark A. Hughes, Auteur ; Jessica Wood, Auteur ; Edward Rosenberg, Auteur Année de publication : 2008 Article en page(s) : p. 6765–6774 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Silica polyamine composite Amine ligands Résumé : Previously, silica polyamine composite (SPC) materials (BP-1 and WP-1) containing amine chelating groups were prepared using two polyamines, polyallylamine (PAA), and polyethyleneimine (PEI). In this paper the amine ligands of BP-1 and WP-1 were modified with chloroacetate, yielding the new SPC materials BP-2 and WP-2. We have found that the acetate groups were bound to the amine groups to a greater extent on the SPC prepared using PAA (BP-1) relative to the SPC prepared with PEI (WP-1). BP-2 was selective for Cu2+ over other divalent metal ions from polymetallic solutions in the pH range of 1 to 3. In contrast, WP-2 was selective for Cu2+ over other divalent metal ions at pH 1 only and coloaded significant amounts of Ni2+ at pH 2 and pH 3. Thus, polyamine structure impacts the metal selectivity of the resultant SPC materials, BP-2 and WP-2. Two novel SPCs were prepared from nitriloacetic acid (NTA) anhydride using BP-1 and WP-1, yielding BP-NT and WP-NT, respectively. The resultant materials possess a unique chelating ligand, in which an iminodiacetic acid (IDA) group is covalently bonded to the SPC amine groups via an amide bond. The two materials (BP-NT, WP-NT) have similar metal selectivity profiles indicating that polyamine structure is not influential. Increased ligand denticity and the amide linker prevent the polymer from playing a large role in selectivity. The resulting materials have the ability to remove divalent and trivalent metal ions from low pH aqueous solutions. These materials can be regenerated by treatment with acid solution and showed no evidence of amide bond hydrolysis under acidic conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800359k [article] Polymer structure and metal ion selectivity in silica polyamine composites modified with sodium chloroacetate and nitriloacetic acid (NTA) anhydride [texte imprimé] / Mark A. Hughes, Auteur ; Jessica Wood, Auteur ; Edward Rosenberg, Auteur . - 2008 . - p. 6765–6774. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6765–6774 Mots-clés : Silica polyamine composite Amine ligands Résumé : Previously, silica polyamine composite (SPC) materials (BP-1 and WP-1) containing amine chelating groups were prepared using two polyamines, polyallylamine (PAA), and polyethyleneimine (PEI). In this paper the amine ligands of BP-1 and WP-1 were modified with chloroacetate, yielding the new SPC materials BP-2 and WP-2. We have found that the acetate groups were bound to the amine groups to a greater extent on the SPC prepared using PAA (BP-1) relative to the SPC prepared with PEI (WP-1). BP-2 was selective for Cu2+ over other divalent metal ions from polymetallic solutions in the pH range of 1 to 3. In contrast, WP-2 was selective for Cu2+ over other divalent metal ions at pH 1 only and coloaded significant amounts of Ni2+ at pH 2 and pH 3. Thus, polyamine structure impacts the metal selectivity of the resultant SPC materials, BP-2 and WP-2. Two novel SPCs were prepared from nitriloacetic acid (NTA) anhydride using BP-1 and WP-1, yielding BP-NT and WP-NT, respectively. The resultant materials possess a unique chelating ligand, in which an iminodiacetic acid (IDA) group is covalently bonded to the SPC amine groups via an amide bond. The two materials (BP-NT, WP-NT) have similar metal selectivity profiles indicating that polyamine structure is not influential. Increased ligand denticity and the amide linker prevent the polymer from playing a large role in selectivity. The resulting materials have the ability to remove divalent and trivalent metal ions from low pH aqueous solutions. These materials can be regenerated by treatment with acid solution and showed no evidence of amide bond hydrolysis under acidic conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800359k

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