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Separation of Organic Species from Wastewater Using a Polyol Supported Liquid Membrane

100%

Ashraf W. , Bukhari A.

2007

tom Vol. 81, nr 9

1621-1628

This paper examines the application of supported liquid membrane for the removal of organic compounds in the aqueous waste effluents. Polypropylene glycol was employed as carrier mounted on PTFE supports. It has been demonstrated that polyols act as efficient carrier for selective removal of organic compounds having an acidic -OH group. Mass transfer coefficient in creased when the number of carbon atoms in creased from 4 to 6. A correlation between pKa, pH and flux of permeating species has been demonstrated. Aromatic compounds showed higher transportrates as compared to similar aliphatic compounds. Effect of temperature on the transportrates has been studied. It has been shown that a mock waste solution can be transported up to >90% under the conditions studied.

The Elimination of Cadmium(II) from Aqueous Environment by Supported Liquid Membrane Method Using the Basic Carrier

100%

Ashraf M. W. , Bukhari A.

2009

tom Vol. 83, nr 1

19-30

The transport of cadmium ions through a supported liquid membrane containing triethanolamine (TEA) as a mobile carrier has been studied. The effects of Cd(II) concentration, HCl in feed and car rier con cen tra tion in mem brane have been stud ied. Cd(II) con - cen tra tion in crease in feed leads to an increase influx from 2.1´10-7 to 8.4´10-7 mol cm-2 sec-1 within Cd(II) ions concentration range (2.7´10-4 M - 16.3´10-4 M) at 2.0 M HCl in the feed and 3.0 M triethanolamine in the membrane. Increase in H+ ion concentration from 0.5 M to 3.0 M results in an increase in Cd(II) ions flux but a decrease is observed beyond 2.0 M HCl concentration in feed. Increase in carrier concentration in the liquid inside the membrane enhances the flux with its maxima at 3.0 M carrier. Further increase in the concentration of TEA leads to a decrease in transport due to increase in viscosity of membrane liquid. The optimum conditions for Cd(II) ions transport are, 2.0 M HCl in feed, 3.0 M TEA in membrane and 0.1 M NaOH as strip solution. Similar transport characteristics have been observed for Cd-EDTA complexed anions across TEA- cyclo - hexanone based SLM, thus indicating a cadmium anion transport coupled with protons and chloride or EDTA co-ions.