Affiliation: | aLaboratoire Eau et Technologies Membranaires, CERTE, BP 273, 8020 Soliman, Tunisia bDepartment of Chemistry, University of Girona, 17071 Girona, Spain cUniversité de Lyon, Lyon, F-69003, France; Université Lyon 1, Villeurbanne, F-69622, France; CNRS, UMR 5246, ICBMS, équipe CSAp, 43 boulevard du 11 novembre 1918, Villeurbanne, F-69622, France dInstitut Européen des Membranes, UMR CNRS 5635, 1919 route de Mende, 34293 Montpellier, France |
Abstract: | The complexation abilities of different thiacalix4]arene derivatives towards some rare earth metal ions, metallic pollutants, and noble metals have been investigated in liquid–liquid experiments. Thiacalix4]arene dissolved in chloroform effectively extracts Pd(II) (in acidic chloride media) and also Ag(I), Cd(II), Sm(III) and Ce(III), all buffered at pH 6 or 8. The modification of this compound to form an amide derivative results in an effective extraction of noble metals, ranked according to Au(III) > Pd(II) > Pt(IV) > Ag(I). Moreover, a supported liquid membrane system for silver transport has been developed based on thiacalix4]arene dissolved in NPOE, and parameters affecting its efficiency have been investigated, such as the stripping composition and the pH of the feed solution. Finally, the selectivity of the membrane system has been evaluated by using as feed sources mixtures of silver and other metal ions. |