The Role of Feed Metal Concentration in the Coupled Transport of Zinc through a Bis-(2-ethylhexyl)phosphoric Acid Solid Supported Liquid Membrane from Aqueous Perchlorate Media

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Abstract
The coupled transport of Zn(II) macroconcentrations (up to 100 mmol/dm3) and H+ through a solid supported liquid membrane (SSLM) consisting of bis-(2-ethylhexyl)phosphoric acid (HDEHP) dissolved in the aliphatic kerosene Isopar-H has been investigated as a function of the hydrodynamic characteristics and chemical composition of the system. The results were analyzed in terms of a model considering the aqueous and organic diffusion as well as chemical reaction rates in order to explain the observed zinc transfer rates. The analysis showed the importance of the carrier saturation phenomenon taking place as the metal concentration is increased and the subsequent minimization of the role of chemical reaction kinetics.