Abstract
A kinetic study of chromate ions (Cr 2O 7 2−) transport from an aqueous donor phase into an aqueous acceptor phase through a bulk liquid membrane containing p- tert-butylcalix[4]arene dioxaoctylamide derivative as a carrier was studied. The influence of pH on donor and acceptor phase, effect of chromate and carrier concentration, type of solvent, stirring speed and temperature were investigated. The kinetic parameters ( k 1, k 2, R m max , t max, J d max , J a max ) were calculated for the interface reactions assuming two consecutive, irreversible first-order reactions. The activation energy values are calculated as 16.89 and 10.34 kJ mol −1 for extraction and reextraction, respectively. The values of calculated activation energy indicate that the process is diffusionally controlled by chromate ions. The experiments demonstrated that p- tert-butylcalix[4]arene dioxaoctylamide derivative is a good carrier for Cr(VI) transport through liquid membranes in this study.
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