A spiral flowing supported liquid membrane based on DEHPA carrier for the separation of lead from seawater

Abstract

A B S T R A C TThis work aims to study the use of a spiral supported liquid membrane (SLM) to extract lead (Pb) from seawater matrix using the di-(2-ethylhexyl) phosphoric acid (DEHPA) dissolved in kerosene as carrier. In this regard, several physical and chemical parameters which could affect Pb extraction (sample pH, sodium acetate buffer, HNO 3 concentration in stripping solution, masking agent effect, flow rate, filter porosity, and configuration of the SLM cell) were studied. In this sense, the permeability parameter was selected to probe the system efficiency. The optimal preconcentration factor was found to be of 14.2, after 2 h under the following conditions: sample pH equal to 4.7 buffered until a 0.08 M of sodium acetate, DEPHA concentration fixed at 0.21 M and HNO 3 concentration of 0.23 M in stripping solution. Besides, SLM filters were analyzed by electron microscopy after each period of 2 h and several microparticles and other deposits in form of a thin layer were observed in the polymeric support.

Use of D2EHPA-mediated liquid membranes for heavy metal ions separation: A review

“…The published results in this direction are promising. For example, D2EHPA-mediated LM systems were successfully used for selective separation and concentration of metal ion(s) present at very low traces levels in aqueous samples into receiving phase such as lead, 45,46 cadmium, 42 copper ions, 57 and a mixture of seven heavy metals. 63 Compared with the analytical procedures commonly used for trace metal determination in diluted aqueous samples, the new LM systems may be used as a very clean (sample contamination-free), simple, and one-step alternative for semiquantitative, and even quantitative, simultaneous determination of heavy metals in seawater.…”

“…Benomar and coworkers have developed and optimized two LM systems, a BLM 45 and a spiral flowing SLM, 46 to be separation and preconcentration steps of lead ions by D2EHPA as an active carrier from seawater samples into the acidic phase. A determination of lead concentration in receiving phase is subsequently measured by inductively coupled plasma-mass spectrometry (ICP-MS).…”