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Anion-exchange reactions of layered double hydroxides / S. V. Prasanna in Industrial & engineering chemistry research, Vol. 48 N° 13 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6315–6320 Titre : Anion-exchange reactions of layered double hydroxides : interplay between coulombic and H-bonding interactions Type de document : texte imprimé Auteurs : S. V. Prasanna, Auteur ; P. Vishnu Kamath, Auteur Année de publication : 2009 Article en page(s) : pp. 6315–6320 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Layered  double  hydroxides  Anions  Nonequilibrated  conditions  Cl−  NO3−  ions Résumé : The NO3−- and Cl−-containing layered double hydroxides (LDHs) of Mg with Al interact weakly with anions in solution under equilibrated conditions and yield a type V isotherm. The uptake of anions under nonequilibrated conditions varies monotonically with the layer charge when the outgoing anion is NO3−, whereas it goes through a maximum when the outgoing anion is Cl−. These observations suggest that Coulombic interactions play a dominant role in Cl−-LDHs, whereas weak interactions governing the mode of intercalation of NO3− ions influence the exchange reactions of NO3−-LDHs. These studies have significant implications for the remediation of insidious anions by LDHs. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9004332 [article] Anion-exchange reactions of layered double hydroxides : interplay between coulombic and H-bonding interactions [texte imprimé] / S. V. Prasanna, Auteur ; P. Vishnu Kamath, Auteur . - 2009 . - pp. 6315–6320. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6315–6320 Mots-clés : Layered  double  hydroxides  Anions  Nonequilibrated  conditions  Cl−  NO3−  ions Résumé : The NO3−- and Cl−-containing layered double hydroxides (LDHs) of Mg with Al interact weakly with anions in solution under equilibrated conditions and yield a type V isotherm. The uptake of anions under nonequilibrated conditions varies monotonically with the layer charge when the outgoing anion is NO3−, whereas it goes through a maximum when the outgoing anion is Cl−. These observations suggest that Coulombic interactions play a dominant role in Cl−-LDHs, whereas weak interactions governing the mode of intercalation of NO3− ions influence the exchange reactions of NO3−-LDHs. These studies have significant implications for the remediation of insidious anions by LDHs. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9004332