Abstract
In the present study, the compound N-benzoyl- N′, N′-diheptadecylthiourea has been evaluated as carrier for the extraction of toxic metals. Liquid–liquid extraction experiments of Hg(II), Cd(II) and Pb(II) in nitrate media were performed, and neither cadmium nor lead were extracted in the pH range from 2 to 6, showing benzoylthiourea derivative as a high selective extractant for mercury. A solid supported liquid membrane system has been developed for mercury permeation using 0.3 M thiourea as stripping agent. Several parameters affecting liquid membrane performance are evaluated, such as the organic solvent, where the best results are obtained with a mixture decaline:cumene, the feed composition and the length of alkyl chains in the carrier. The choice of the polymeric support material used to contain the liquid membrane, as well as its physical characteristics, was found to be crucial to ensure an effective metal transport across the liquid membrane. The application of this SLM in hollow fiber supported liquid membrane (HFSLM) configuration allowed the enrichment of solutions with low mercury content. High preconcentration factors are obtained, showing the feasibility of using the developed system as an effective technique for analytical applications.
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