Affinity membranes for the extraction of Cd²⁺ metal ions by facilitated transport ensured by a new thiacalix[4]arene complexing agent incorporated in supported liquid membranes (SLM)

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• 作者：Zaghbani ; Asma ; Tayeb ; Rafik ; Bonnamour ; Isabelle ; Felix ; Caroline ; Vocanson ; Francis ; Lamartine ; Roger ; et. al.
• 关键词：Affinity membrane ; Carriers ; Thiacalixarenes ; Facilitated transport
• 刊名：Journal of Membrane Science
• 出版年：2005
• 出版时间：August 1, 2005
• 年：2005
• 卷：258
• 期：1-2
• 页码：5-7
• 全文大小：82.1 K

文摘

A thiacalix[4]arene dissolved in NPOE for incorporation in a supported liquid membrane, is shown to ensure a transmembrane transport flux of Cd²⁺ ions with an order of magnitude higher than that obtained with a very lipophilic carrier such as Lasalocide A, according to a mechanism of active facilitated transport (coupled to a pH gradient). Liquid–liquid (water-NPOE) extraction experiments confirmed the good affinity of the thiacalix[4]arene for the Cd²⁺ ions at the interface between an aqueous medium of pH = 8 and NPOE organic phase, as well as its almost complete release in water when the pH of the aqueous phase is changed to acid.