Macrocycle-Mediated Transport in a Bulk 1.5 M HNO3-CHCI3-0.01 M HNO3Membrane System of Pd2+and Mn+from Pd2+Mn+Mixtures

Abstract

Pd²⁺ has been transported using sulfur substituted macrocycles as carriers and several Mⁿ⁺ (Mⁿ⁺ = Lⁱ⁺, Na⁺, K⁺, Rb⁺, Cs⁺, Mg²⁺, Ca²⁺, Sr²⁺, Ba²⁺, Ag⁺, TL⁺, Cd²⁺, and Pb²⁺) have been transported using 18-crown-6 (18C6) and sulfur substituted macrocycles as carriers in a 1.5M HN0₃/CHCL₃3/0.01M HNO₃ bulk liquid membrane system. Competitive Pd²⁺-Mⁿ⁺ transport studies have also been carried out for the same systems. The cyclic polyether 18C6 transports Mⁿ⁺ selectively over Pd²⁺ for all Mⁿ⁺ except Li⁺, Mg²⁺, and Cd²⁺. In the cases of these three cations, no transport was found for either Pd²⁺ or Mⁿ⁺. Generally, the sulfur substituted macrocycles transport Pd²⁺ selectively over Mⁿ⁺.