Effect of kinetic synergist on transport of copper(II) through a liquid membrane containing P[sub 507] in kerosene

He, Dingsheng; Ma, Ming; Wang, Hui; Zhou, Pandeng
August 2001
Canadian Journal of Chemistry;Aug2001, Vol. 79 Issue 8, p1213
Academic Journal
A new kinetic synergism system for copper(II) transport through a bulk liquid membrane containing mono(2-ethyhexyl)-2-ethyhexyl phosphate and Manoxol OT (OT) was examined. The influence of stripping agent, anion, pH in feed phase, and carrier concentration were investigated. The kinetics of Cu(II) transport could be analyzed in the formalism of two consecutive irreversible first-order reactions, considering both extraction and stripping. The pseudo-first-order apparent rate constants of interfacial reactions in membrane transport are determined by altering the temperature. The activation energy values are 38.1 kJ mol[sup –1] for extraction and 32.8 kJ mol[sup –1] for stripping. The experiments demonstrated that Manoxol OT is a good kinetic synergist for Cu(II) transport through liquid membranes in this study. The kinetic synergism of OT for extraction of Cu[sup 2+] ions is analyzed.Key words: copper ions, kinetic synergist, liquid membrane.On a étudié un nouveau système de synergie cinétique pour le transport du cuivre(II) à travers une membrane formée d'une masse liquide contenant du phosphate de mono(2-éthylhexyle)-2-éthylhexyle ainsi que du Manoxol OT (OT). On a examiné l'influence de l'agent de redissolution, le pH de la phase insérée et la concentration du porteur. On peut analyser la cinétique du transport du Cu(II) dans un formalisme de deux réactions irréversibles et consécutives du premier ordre appliquées à l'extraction et à la redissolution. Les constantes apparentes de pseudo-premier ordre des réactions interfaciales dans le transport à travers la membrane ont été déterminées en modifiant la température. Les valeurs de l'énergie d'activation sont de 38,1 kJ mol[sup –1] pour l'extraction et de 32,8 kJ mol[sup –1] pour la redissolution. Les expériences réalisées au cours de cette étude ont démontré que le Manoxol OT est un bon agent de synergie cinétique pour le transport du Cu(II) à travers des membranes liquides. On a analysé la synergie cinétique du OT pour l'extraction des ions Cu[sup 2+] .Mots clés : ions cuivres, synergie cinétique, membrane liquide.[Traduit par la Rédaction]


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