Volume 20, Issue 6 pp. 554-559
Article
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Transport of Ca2+ Ion through a Bubbling Pseudo-emulsion Liquid Membrane with Calixarenes and Calixcrowns as Carriers

Li Wang

Li Wang

Department of Chemistry, Tongji University, Shanghai 200092, China

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Qi-Yu Zheng

Qi-Yu Zheng

Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China

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Yan-Yan Cao

Yan-Yan Cao

Department of Chemistry, Tongji University, Shanghai 200092, China

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Yu Liu

Yu Liu

Department of Chemistry, Tongji University, Shanghai 200092, China

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Zhong-Liang Jiang

Zhong-Liang Jiang

Department of Chemistry, Tongji University, Shanghai 200092, China

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Xian-Fa Shi

Xian-Fa Shi

Department of Chemistry, Tongji University, Shanghai 200092, China

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First published: 26 August 2010
Citations: 1

Abstract

Several new calixcrowns were synthesized and characterized. The transport of Ca2+ ion was investigated through a bubbling pseudo-emulsion liquid membrane with these calixcrowns, the parent calix[n]arenes (n = 4, 6, 8) and the ester, acid derivatives of calix[4]arene as mobile carriers. The effects of the initial concentrations of Ca2+ ion in the source phase and the initial pH difference (ΔpH) between the receiving phase and the source phase were studied. The results suggest that there are two different transport mechanisms. The transports using calixarenes and their ester, acid derivatives as carriers represent a proton-coupled co-transport with a flow of protons in the opposite direction, while the transports using the calixcrowns as carriers exhibit the characteristics of an anion-coupled co-transport with a flow of anion in the same direction.

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