Journal article

Polymerisation effects in the extraction of Co(II) into polymer inclusion membranes containing Cyanex 272. Structural studies of the Cyanex 272-Co(II) complex

Stephen P Best, Spas D Kolev, June RP Gabriel, Robert W Cattrall

Journal of Membrane Science | ELSEVIER SCIENCE BV | Published : 2016


The instability and poor reproducibility of polymer inclusion membranes (PIMs) containing Cyanex 272 (di(2,4,4-trimethylpentyl)phosphinic acid, HCyanex) for the extraction of cobalt(II) have been investigated using chemical and spectroscopic means. The differing transport properties of the cobalt:Cyanex adducts, and the formation of deep blue oils exuded from the surface of the PIM under particular extraction conditions are explained in terms of oligomerisation of the cobalt centres with the Cyanex anion acting as a bridging ligand, {Co:Cyanex } . Oligomers present within the polymer matrix are not available for back-extraction and if formed on the surface of the membrane are unable to diffu..

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Awarded by Australian Research Council

Funding Acknowledgements

The XAFS experiments were performed at the Australian National Beamline Facility with support from the Australian Synchrotron Research Program, which is funded by the Commonwealth of Australia under the Major National Research Facilities Program. Dr. Garry Foran is thanked for expert assistance with the XAFS experiments. We are grateful to the Australian Research Council for financial support through Discovery grant to SK, DP0557575.