Studies on Heteromacrocyclic Polyether(Ⅻ)──Liquid Membrane Transport Properties of Metal Cations by Oxa-,Thia-,Selena- or TeIlura-Crown Ether

Abstract

Abstract: The liquid membrane transport rates of the nitrate saIts of Na⁺,K⁺, Ag⁺ andPb²⁺ by 10-tellurabenzo-15-crown-5(TeB15C5)were firstly determined, and compared withthose by the corresponding benzo-15-crown-5(B15C5), 10-thiabenzo-15-crown-5(SB15C5)and 10-selenabenzo-15-crown-5(SeB15C5).At the same time,the effects of the concentrations of SeB15C5 in the membrane phase and K⁺ in the source phase on the transport rates of K⁺were also investigated.The experimental data indicate that the relationship is linear between the transport rates of K⁺ and the concentrations of SeBl5C5 and K⁺ respectively.Thetransport rates of Na⁺,K⁺ and Pb²⁺ by TeB15C5 are larger than those by SB15C5 andSeB15C5,but the transport rates of Ag⁺ by SB15C5 and SeB15C5,especially by SeB15C5,are much larger than those by TeB15C5.SB15C5 and SeB15C5 show a very high transportselectivity for Ag⁺ over Na⁺,K⁺ and Pb²⁺,and can be used to separate and recover noblemetals such as silver.

Key words: Crown ether, Thiacrown ether, Selenacrown ether, Telluracrown ether, Liquidmembrane transport

TrendMD:

LI Wei-Ping, GONG Shu-Ling, LIU Xiu-Fang, LU Xue-Ran, XU Han-Sheng. Studies on Heteromacrocyclic Polyether(Ⅻ)──Liquid Membrane Transport Properties of Metal Cations by Oxa-,Thia-,Selena- or TeIlura-Crown Ether[J]. Chem. J. Chinese Universities, 1996, 17(4): 501.

References

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