Abstract
The transport of chromate ions (Cr 2O 7 2−) from an aqueous solution into an aqueous receiving solution through a bulk liquid membrane containing p- tert-butyl calix[4]arene 3-morpholino propyl diamide as a carrier was examined. 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 , t max , R m 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 24.83 kJ mol −1 for extraction and 5.14 kJ mol −1 for reextraction. These values indicate that the process is diffusionally controlled by chromate ions. The experiments demonstrated that calix[4]arene diamide derivative is a good carrier for Cr(VI) transport through liquid membranes in this study.
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