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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.


The structural formula of A: Span 80 (sorbitan monooleate); B: Tween 80 (ethoxylated sorbitan monooleate); and C: TOMAC (tri-n-octylmethylammonium chloride); D: Schematic representation of the geometrical packing of the surfactants at the oil-water interface in dispersed oil droplets.
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membranes-05-00168-f002: The structural formula of A: Span 80 (sorbitan monooleate); B: Tween 80 (ethoxylated sorbitan monooleate); and C: TOMAC (tri-n-octylmethylammonium chloride); D: Schematic representation of the geometrical packing of the surfactants at the oil-water interface in dispersed oil droplets.

Mentions: Palm oil was purchased from the market of brand Buruh, which is cooking oil; a fraction of refined bleached deodorized palm oil called olein consisting of mostly unsaturated fatty acids [19]. Pure Tween 80 was purchased from R&M Chemicals (Petaling Jaya, Malaysia). Span 80, TOMAC, and butanol were obtained from MERCK (Petaling Jaya, Malaysia). K2Cr2O7 (Potassium dichromate) was purchased in powder form from R&M Chemicals. All chemicals were used without further purification. The molecular structure of these components is shown in Figure 2.


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)

The structural formula of A: Span 80 (sorbitan monooleate); B: Tween 80 (ethoxylated sorbitan monooleate); and C: TOMAC (tri-n-octylmethylammonium chloride); D: Schematic representation of the geometrical packing of the surfactants at the oil-water interface in dispersed oil droplets.
© Copyright Policy
Related In: Results  -  Collection

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

membranes-05-00168-f002: The structural formula of A: Span 80 (sorbitan monooleate); B: Tween 80 (ethoxylated sorbitan monooleate); and C: TOMAC (tri-n-octylmethylammonium chloride); D: Schematic representation of the geometrical packing of the surfactants at the oil-water interface in dispersed oil droplets.
Mentions: Palm oil was purchased from the market of brand Buruh, which is cooking oil; a fraction of refined bleached deodorized palm oil called olein consisting of mostly unsaturated fatty acids [19]. Pure Tween 80 was purchased from R&M Chemicals (Petaling Jaya, Malaysia). Span 80, TOMAC, and butanol were obtained from MERCK (Petaling Jaya, Malaysia). K2Cr2O7 (Potassium dichromate) was purchased in powder form from R&M Chemicals. All chemicals were used without further purification. The molecular structure of these components is shown in Figure 2.

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.