Kinetic analysis of coupled transport of nitrite ions through liquid membranes at different temperatures

Abstract

Non-steady state kinetics of the coupled transport of nitrite (NO2-) ions through liquid membranes (n-hexane 85% + chloroform 15%) containing tetraoctylammonium chloride as a carrier was examined at temperatures ranging from 273-308 degrees K. In this study, the, influence of temperature on the kinetic parameters (k(1d), k(2m), k(2a), t(max), R-m(max), J(d)(max), J(a)(max)) was investigated. The membrane entrance (k(1d)) and exit rates (k(2m), k(2a)) were increased with temperature. For maximum membranes entrance and exit fluxes, the activation energies were calculated from the slopes of the two linear relationships: E-ad = 6.62 kcal/mol and E-aa = 6.63 kcal/mol, respectively. The values of the calculated activation energy indicate that the process is diffusionally controlled.