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Tetraalkylphosphonium Ionic Liquid Encapsulation in Alginate Beads for Cd(II) Sorption from HCl Solutions |
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| Authors: | M. Kica T. Vincent A. Trochimczuk R. Navarro |
| Affiliation: | 1. Ecole des Mines d’Alès, Centre des Matériaux des Mines d’Alès, Matériaux Polymères Avancés, Equipe Biopolymères, Conditionnement et Interfaces, Alès cedex, France;2. Wroc?aw University of Technology, Faculty of Chemistry, Wroc?aw, Poland;3. Wroc?aw University of Technology, Faculty of Chemistry, Wroc?aw, Poland;4. Universidad de Guanajuato, División de Ciencias Naturales y Exactas, Departamento de Química, Guanajuato, Gto, Mexico |
| Abstract: | Cyphos IL 105 (tetraalkylphosphonium dicyanamide) was immobilized in alginate capsules (IL vesicle entrapped in a biopolymer layer, as shown by SEM-EDX analysis). This material was tested for efficient Cd(II) sorption from HCl solutions. The concentration of HCl and chloride ions hardly influenced metal sorption that proceeds through ion exchange between Cd(II) (under the form of CdCl42?) and 2 dicyanamide groups. The sorption capacity (at saturation of the resin) proportionally increased with IL content (respecting the 1:2 stoichiometry between Cd(II) and the phosphonium cation). The uptake kinetics are well described by the Crank’s equation (resistance to intraparticle diffusion) and by the pseudo-second order rate equation (chemical reaction rate). |
| Keywords: | alginate Cyphos IL105 cadmium sorption intraparticle diffusion control pseudo-second order rate equation SEM-EDX analysis |