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Membrane Water Treatment
  Volume 3, Number 2, April 2012 , pages 123-131
 open access

Selective transport of Cadmium by PVC/Aliquat 336 polymer inclusion membranes (PIMs): the role of membrane composition and solution chemistry
Sandra Adelung, Burkhard Lohrengel and Long Duc Nghiem

    This study investigated the extraction and stripping performance of PIMs consisting of PVC and Aliquat 336. Extraction and stripping of three representative heavy metals - namely Cd2+, Cu2+, and Zn2+ - by the synthesized membranes were evaluated as a function of sodium chloride concentration and under different stripping solutions (0.01 M HNO3, Milli-Q water, 0.01 M HCl and 0.01 M NaOH), respectively. Results reported here indicate that the formation of negatively charged metal chloride complex species was responsible for the extraction of the target metal to PIMs. Experimental results and thermodynamic modeling of the speciation of chloro metal complexes further confirm that the extraction selectivity between Cd2+, Cu2+ and Zn2+ can be controlled by regulating the chloride concentration of the feed solution. An acidic solution without any chloride was the most effective stripping solution, followed by Milli-Q water, and a diluted hydrochloric acid solution. On the other hand, the stripping of metals from PIMs did not occur when a basic stripping solution was used.
Key Words
    polymer inclusion membranes (PIMs); metal extraction; base polymer; PVC; Aliquat 336
Sandra Adelung, Burkhard Lohrengel : Department of Process Engineering and Environmental Technology, Faculty of Engineering 2, Heilbronn University, Heilbonn, Germany
Long Duc Nghiem : Environmental Engineering, University of Wollongong, NSW 2522, Australia

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