Facilitated Transport of CO₂ in Liquid Membrane of CsHCO₃ Aqueous Solution

Abstract

The facilitated transport of CO₂ gas through liquid membranes of aqueous 0-6.27mol/L CsHCO₃ solution was studied. The permeability ratio Pco₂/Po₂ was found to increase at high CsHCO₃ concentration in the liquid membrane. The pressure dependence of the permeability coefficients was also measured. The concentration profiles of CO₂, HCO₃^-, CO₃^2- and H⁺ were calculated by assuming that the concentration of CO₂ and HCO₃^- can be represented as polynomial functions of the position coordinate x in the membrane, and the Fick’s second law holds. The experimental results of the permeability coefficients of CO₂ were explained satisfactory by assuming the linear concentration profiles of CO₂ and HCO₃^- in the membrane.