Deterioration of Liquid Membrane and Its Improvement in Permeation Transport of Zn(II) Ion through a Supported Liquid Membrane Containing a Bathocuproine

Abstract

Abstract Investigations were made on the deterioration of liquid membrane in the permeation transport of zinc ion through a supported liquid membrane (SLM) as well as on its improvement. An SLM made of a porous polypropylene membrane impregnated with a dibenzyl ether solution of bathocuproine (4,7-diphenyl-2,9-dimethyl-1,10-phenanthroline) as the carrier and a composite membrane (SLM-DM) made of the said SLM sandwiched between two dialysis membranes were prepared to make zinc ion permeation tests on both membranes. The permeation velocities of zinc ions increased with increasing temperature with both membranes. With the SLM every 1°C increase in temperature brought an increase in the permeation velocity of a zinc ion of 4.90 × 10−11 mol/cm2s and with the SLM-DM 1.21 × 10−11 mol/cm2s. For the SLM, a deterioration of the liquid membrane with time took place and resulted in a loss of its ability to function as a membrane in 60, 50, and 20 h at 25, 40, and 50°C, respectively. On the other hand, for the SLM-DM...