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

Non-steady state kinetics of coupled transport of nitrate (NO3-) ions through liquid membranes (n-hexane 85% + trichloromethane 15%) containing tetraoctyl ammonium chloride as a carrier was examined at temperature range of 273-303 degreesK, In this study, kinetics of nitrate ion transport has been analyzed in the formalism of two consecutive irreversible first order reactions. The influence of temperature on the kinetic parameters (k(1d), k(2m), k(2a), t(max), R-m(max), J(m)(max), J(a)(max)) has been investigated. The membrane entrance (k(1d)) and exit rates (k(2m), k(2a)) have been increased with temperatures. For maximum membrane entrance (J(m)(max)) and exit (J(a)(max)) fluxes the activation energies were calculated from the slopes of the two linear relationships: E-ad=6.99 kcal/mol and E-aa= 6.97 kcal/mol, respectively. The values of the calculated activation energy indicate that the process is diffusionally controlled.