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Recovery of germanium from aqueous solutions by ion - exchange extraction of its catechol complex / Fátima Arroyo Torralvo in Industrial & engineering chemistry research, Vol. 49 N° 10 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4817–4823 Titre : Recovery of germanium from aqueous solutions by ion - exchange extraction of its catechol complex Type de document : texte imprimé Auteurs : Fátima Arroyo Torralvo, Auteur ; Constantino Fernández-Pereira, Auteur ; Maria C. Campanario, Auteur Année de publication : 2010 Article en page(s) : pp. 4817–4823 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Ion  exchange  Aqueous  solution Résumé : The paper is concerned with the recovery of germanium from dilute aqueous solutions. The method is based on the sorption of the selective complex formed by catechol with germanium onto low-cost anionic resins. Experimental investigations were undertaken using conventional quaternary ammonium macroporous resins: Amberlite IRA-900 and IRA-958. The influence of pH, metal concentration, and amounts of resin and catechol on the sorption capacity were investigated. For a proper set of experiments, a statistical technique such as a response surface methodology (RSM) has been used. For the investigation of the exchange equilibrium, the experimental data were analyzed using the Langmuir, Freundlich and Dubinin−Radushkevich equations, the Freundlich isotherm in general constituting a better fit. The uptake of the germanium complex by the ion-exchange resins was reversed by acid and neutral solutions. The results obtained showed better performance for IRA-900 than IRA-958, measured in terms of global recovery yields (retention and elution). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=22797476 [article] Recovery of germanium from aqueous solutions by ion - exchange extraction of its catechol complex [texte imprimé] / Fátima Arroyo Torralvo, Auteur ; Constantino Fernández-Pereira, Auteur ; Maria C. Campanario, Auteur . - 2010 . - pp. 4817–4823. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4817–4823 Mots-clés : Ion  exchange  Aqueous  solution Résumé : The paper is concerned with the recovery of germanium from dilute aqueous solutions. The method is based on the sorption of the selective complex formed by catechol with germanium onto low-cost anionic resins. Experimental investigations were undertaken using conventional quaternary ammonium macroporous resins: Amberlite IRA-900 and IRA-958. The influence of pH, metal concentration, and amounts of resin and catechol on the sorption capacity were investigated. For a proper set of experiments, a statistical technique such as a response surface methodology (RSM) has been used. For the investigation of the exchange equilibrium, the experimental data were analyzed using the Langmuir, Freundlich and Dubinin−Radushkevich equations, the Freundlich isotherm in general constituting a better fit. The uptake of the germanium complex by the ion-exchange resins was reversed by acid and neutral solutions. The results obtained showed better performance for IRA-900 than IRA-958, measured in terms of global recovery yields (retention and elution). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=22797476