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A new emulsion liquid membrane based on a palm oil for the extraction of heavy metals.

Björkegren S, Karimi RF, Martinelli A, Jayakumar NS, Hashim MA - Membranes (Basel) (2015)

Bottom Line: Span 80 is used as surfactant and butanol as co-surfactant.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 Article: PubMed Central - PubMed

Affiliation: Applied Surface Chemistry, Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden. sanna.bjorkegren@chalmers.se.

ABSTRACT
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.

No MeSH data available.


Chromium removal efficiency without TOMAC as carrier. Filled square (■) contains 3 wt% Span 80, 1 wt% Tween 80, 1 wt% butanol and 0.35 wt% TOMAC. Open square (□) contains 2.5 wt% Span 80, 1 wt% Tween 80, 0.35 wt% TOMAC.
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membranes-05-00168-f007: Chromium removal efficiency without TOMAC as carrier. Filled square (■) contains 3 wt% Span 80, 1 wt% Tween 80, 1 wt% butanol and 0.35 wt% TOMAC. Open square (□) contains 2.5 wt% Span 80, 1 wt% Tween 80, 0.35 wt% TOMAC.

Mentions: The effect of TOMAC as carrier. To verify the influence and the function of TOMAC as a carrier in the palm oil based ELM, experiments were carried out with and without TOMAC in the membrane phase. Figure 7 clearly shows that the presence of TOMAC is crucial to achieve a high removal efficiency: the extraction rate observed for systems without TOMAC is decreased by a factor of five to ten compared to systems having the carrier incorporated. These results are comparable to kerosene based systems [5].


A new emulsion liquid membrane based on a palm oil for the extraction of heavy metals.

Björkegren S, Karimi RF, Martinelli A, Jayakumar NS, Hashim MA - Membranes (Basel) (2015)

Chromium removal efficiency without TOMAC as carrier. Filled square (■) contains 3 wt% Span 80, 1 wt% Tween 80, 1 wt% butanol and 0.35 wt% TOMAC. Open square (□) contains 2.5 wt% Span 80, 1 wt% Tween 80, 0.35 wt% TOMAC.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4496638&req=5

membranes-05-00168-f007: Chromium removal efficiency without TOMAC as carrier. Filled square (■) contains 3 wt% Span 80, 1 wt% Tween 80, 1 wt% butanol and 0.35 wt% TOMAC. Open square (□) contains 2.5 wt% Span 80, 1 wt% Tween 80, 0.35 wt% TOMAC.
Mentions: The effect of TOMAC as carrier. To verify the influence and the function of TOMAC as a carrier in the palm oil based ELM, experiments were carried out with and without TOMAC in the membrane phase. Figure 7 clearly shows that the presence of TOMAC is crucial to achieve a high removal efficiency: the extraction rate observed for systems without TOMAC is decreased by a factor of five to ten compared to systems having the carrier incorporated. These results are comparable to kerosene based systems [5].

Bottom Line: Span 80 is used as surfactant and butanol as co-surfactant.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 Article: PubMed Central - PubMed

Affiliation: Applied Surface Chemistry, Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden. sanna.bjorkegren@chalmers.se.

ABSTRACT
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.

No MeSH data available.