A new emulsion liquid membrane based on a palm oil for the extraction of heavy metals
Artikel i vetenskaplig tidskrift, 2015

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.

ionic liquid

palm oil

Emulsion liquid membrane (ELM)

hexavalent chromium

green chemistry

Författare

Anna Martinelli

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Sanna Björkegren

Chalmers, Kemi och kemiteknik

Anna Martinelli

Chalmers, Kemi och kemiteknik

Natesan Subramanian Jayakumar

University of Malaya

Mohd Ali Hashim

University of Malaya

Membranes

2077-0375 (ISSN)

Vol. 5 2 168-179

Drivkrafter

Hållbar utveckling

Ämneskategorier

Fysikalisk kemi

Kemi

Organisk kemi

Styrkeområden

Materialvetenskap

DOI

10.3390/membranes5020168