The performance of a Supported Liquid Membrane (SLM) and a stagnant thin liquid film named as Sandwich LM (SSwLM), in terms of flux and stability has been investigated. Both configurations were tested to transport the Cu2+ ion across the LM from an aqueous solution by using D2EHPA as carrier and n-decane as the organic solvent. The operating conditions of the LM separation were optimised by means of Liquid-Liquid extraction tests, giving particular attention to copper hydroxide formation and precipitation phenomena. Experimental data showed that carrier concentration had a strong influence on avoiding hydroxide formation by shifting the equilibrium curve of the Cu2+-D2EHPA complex at lower pH by increasing the carrier concentration from 0.3 to 30% v/v.The transport and stability tests showed an higher copper flux for the SSwLM vs. the SLM (83.26 vs. 52.4 mmol m-2 h-1) and a higher lifetime too (100 h vs. 15 h).The developed chemical-physical model evidenced a lower overall resistance for copper ion transport through the SSwLM compared to the SLM because the transport in the stagnant sandwiched organic liquid bulk is not influenced by the presence of pores and their tortuosity.

Comparison between stagnant sandwich and supported liquid membranes in copper(II) removal from aqueous solutions: flux, stability and model elaboration

MOLINARI R;ARGURIO P;
2005-01-01

Abstract

The performance of a Supported Liquid Membrane (SLM) and a stagnant thin liquid film named as Sandwich LM (SSwLM), in terms of flux and stability has been investigated. Both configurations were tested to transport the Cu2+ ion across the LM from an aqueous solution by using D2EHPA as carrier and n-decane as the organic solvent. The operating conditions of the LM separation were optimised by means of Liquid-Liquid extraction tests, giving particular attention to copper hydroxide formation and precipitation phenomena. Experimental data showed that carrier concentration had a strong influence on avoiding hydroxide formation by shifting the equilibrium curve of the Cu2+-D2EHPA complex at lower pH by increasing the carrier concentration from 0.3 to 30% v/v.The transport and stability tests showed an higher copper flux for the SSwLM vs. the SLM (83.26 vs. 52.4 mmol m-2 h-1) and a higher lifetime too (100 h vs. 15 h).The developed chemical-physical model evidenced a lower overall resistance for copper ion transport through the SSwLM compared to the SLM because the transport in the stagnant sandwiched organic liquid bulk is not influenced by the presence of pores and their tortuosity.
2005
Supported liquid membrane, Stagnant sandwich liquid membrane, Copper(II) transport, SLM flux, SLM stability
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/123279
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