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Anion effect on Cu2+ adsorption on NH2-MCM-41 / Koon Fung Lam in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9376–9383 Titre : Anion effect on Cu2+ adsorption on NH2-MCM-41 Type de document : texte imprimé Auteurs : Koon Fung Lam, Auteur ; Xinqing Chen, Auteur ; Gordon McKay, Auteur Année de publication : 2009 Article en page(s) : p. 9376–9383 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Anion  affect  Cu2+  adsorption  NH2-MCM-41 Résumé : The anion effect was investigated for the copper adsorption on NH2-MCM-41 from Cu(NO3)2 and CuSO4 solutions. The copper adsorption was higher and faster in the presence of SO42− anion compared to NO3−. The MCM-41 possesses well-ordered mesopores that are readily accessible and a uniform surface that is amenable to the attachment of the chemical moieties for creating tailored adsorption sites. The adsorption sites on NH2-MCM-41 were created by grafting aminopropyls on MCM-41, and the random deposition resulted in a site distribution best described by the Freundlich equation. The majority of the adsorption sites (i.e., up to 70%) are readily accessible to Cu2+ adsorption. The remaining sites were only accessible in the presence of SO42−. Evidence showed that the SO42− anion affects the adsorption by interacting with the dissolved copper to form [CuSO4]0 species, coadsorbing with Cu2+ to form stable complexes, and may even indirectly react with the weakly acidic silanol groups to liberate aminopropyls for more Cu2+ adsorption. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701748b [article] Anion effect on Cu2+ adsorption on NH2-MCM-41 [texte imprimé] / Koon Fung Lam, Auteur ; Xinqing Chen, Auteur ; Gordon McKay, Auteur . - 2009 . - p. 9376–9383. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9376–9383 Mots-clés : Anion  affect  Cu2+  adsorption  NH2-MCM-41 Résumé : The anion effect was investigated for the copper adsorption on NH2-MCM-41 from Cu(NO3)2 and CuSO4 solutions. The copper adsorption was higher and faster in the presence of SO42− anion compared to NO3−. The MCM-41 possesses well-ordered mesopores that are readily accessible and a uniform surface that is amenable to the attachment of the chemical moieties for creating tailored adsorption sites. The adsorption sites on NH2-MCM-41 were created by grafting aminopropyls on MCM-41, and the random deposition resulted in a site distribution best described by the Freundlich equation. The majority of the adsorption sites (i.e., up to 70%) are readily accessible to Cu2+ adsorption. The remaining sites were only accessible in the presence of SO42−. Evidence showed that the SO42− anion affects the adsorption by interacting with the dissolved copper to form [CuSO4]0 species, coadsorbing with Cu2+ to form stable complexes, and may even indirectly react with the weakly acidic silanol groups to liberate aminopropyls for more Cu2+ adsorption. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701748b