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Membranes 2015, 5(2), 168-179; doi:10.3390/membranes5020168

A New Emulsion Liquid Membrane Based on a Palm Oil for the Extraction of Heavy Metals

Applied Surface Chemistry, Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
Department of Chemical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
Author to whom correspondence should be addressed.
Academic Editor: Kyriakos D. Papadopoulos
Received: 18 March 2015 / Revised: 21 March 2015 / Accepted: 13 April 2015 / Published: 23 April 2015
(This article belongs to the Special Issue Advances in Liquid Membranes)
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The extraction efficiency of hexavalent chromium, Cr(VI), from water has been investigated using a vegetable oil based emulsion liquid membrane (ELM) technique. The main purpose of this study was to create a novel ELM formulation by choosing a more environmentally friendly and non-toxic diluent such as palm oil. The membrane phase so formulated includes the mobile carrier tri-n-octylmethylammonium chloride (TOMAC), to facilitate the metal transport, and the hydrophilic surfactant Tween 80 to facilitate the dispersion of the ELM phase in the aqueous solution. Span 80 is used as surfactant and butanol as co-surfactant. Our results demonstrate that this novel ELM formulation, using the vegetable palm oil as diluent, is useful for the removal of hexavalent chromium with an efficiency of over 99% and is thus competitive with the already existing, yet less environmentally friendly, ELM formulations. This result was achieved with an optimal concentration of 0.1 M NaOH as stripping agent and an external phase pH of 0.5. Different water qualities have also been investigated showing that the type of water (deionized, distilled, or tap water) does not significantly influence the extraction rate. View Full-Text
Keywords: emulsion liquid membrane (ELM); palm oil; hexavalent chromium; ionic liquid; green chemistry emulsion liquid membrane (ELM); palm oil; hexavalent chromium; ionic liquid; green chemistry

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Björkegren, S.; Karimi, R.F.; Martinelli, A.; Jayakumar, N.S.; Hashim, M.A. A New Emulsion Liquid Membrane Based on a Palm Oil for the Extraction of Heavy Metals. Membranes 2015, 5, 168-179.

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