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Use of Supported Liquid Membranes as Biomimetics of Active Transport Processes for Metal Ion Recovery: II. Experimental



Use of Supported Liquid Membranes as Biomimetics of Active Transport Processes for Metal Ion Recovery: II. Experimental



Biomimetics 3(1): 57-66



The major objectives of this work are to demonstrate the biomimetic nature Of supported liquid membrane (SLM) systems and to develop a model describing the overall transport process and mechanisms involved. The concentration and recovery of copper ions from dilute aqueous streams were selected as the demonstration process. The results presented in this two-part series show that a pH differential between the aqueous feed and strip streams, separated by this SLM system, mimics the biological proton motive force (PMF) required for this active transport process. In this part, experimental results are presented that demonstrate the biomimetic nature of an SLM and confirm the applicability of the theoretical approach taken in Part I of this series. Various concentrations of DEHPA, di (2-ethylhexyl) phosphoric acid, as the mobile carrier, in n-dodecane were used as the supported liquid membranes. Commercially available microporous polypropylene (PP) membranes and a proprietary developmental poly(tetrafluoroethylene) ceramic (PTFE/ceramic) membrane were used as supports. Experiments were performed in both the batch and the continuous mode to obtain the basic transport/diffusion data to develop the appropriate design equations. These systems permit operation under hydrodynamic conditions, coupled with surface geometric parameters, that render the aqueous film resistances negligible. This flexibility is imperative for future efforts, such as long-term membrane stability characterization, optimization of carrier concentration, and process systems analysis, design, and control studies.

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Accession: 009702764

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