Highly selective and efficient membrane transport of zinc as its thiocyanate complex <span style="font-size:12.0pt;font-family:"Calibri","sans-serif";mso-ascii-theme-font: minor-latin;mso-fareast-font-family:Calibri;mso-fareast-theme-font:minor-latin; mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;color:#222222;mso-ansi-language:EN-IN; mso-fareast-language:EN-US;mso-bidi-language:AR-SA">anion <span style="font-size:12.0pt;font-family:"Calibri","sans-serif";mso-ascii-theme-font: minor-latin;mso-fareast-font-family:Calibri;mso-fareast-theme-font:minor-latin; mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;mso-ansi-language:EN-IN;mso-fareast-language: EN-US;mso-bidi-language:AR-SA">using K⁺-dibenzo-18-crown-6 as a carrier</span></span>

Abstract

A simple, selective and efficient liquid membrane system for the transport of Zn²⁺ ion has been designed. In this system, potassium-dibenzo-18-crown-6 is used as a carrier for the uphill transport of zinc as Zn(SCN)₄^2- complex ion through a chloroform membrane, using

cysteine as a suitable stripping agent in the aqueous receiving phase. Under the optimal experimental conditions, the amount of zinc transported through the liquid membrane after 90 min is found to be 97 ± 1 percent. The selectivity and efficiency of zinc transported from

aqueous solutions containing Ag⁺, Sr²⁺, Mn²⁺, CO²⁺, Ni²⁺, Cu²⁺, Cd²⁺, Pb²⁺, Hg²⁺, Pd²⁺, Fe³⁺, Bi³⁺ and Cr³⁺ ions have been studied.