Nanochemistry and biotechnology
Application of ion exchangers with functional groups in the adsorption process of metal ions
Fila D., Hubicki Z., Kołodyńska D.
Maria Curie-Sklodowska University, Department of Inorganic Chemistry, 
Faculty of Chemistry, M. Curie Sklodowska Sq. 2, 20-031 Lublin  *dominika.fila@poczta.umcs.lublin.pl

Ion-exchange based on synthetic polymeric resins have a wide range of applications in recovery and separation of metal ions and represent an alternative to solvent extraction technologies [1]. Ion exchangers are used in water and wastewater treatment, separation of metals and extraction of valuable metals from different leachates [2,3]. The aim of the paper was to use two macroporous chelating ion exchangers with different functional groups in the adsorption process of La(III) and Ni(II) ions from citric acid solutions. Sorption process tests were carried out for the commercially available ion exchangers Lewatit TP207 with the iminodiacetic functional groups and Purolite S950 with the aminophosphonic functional groups. The influence of various parameters, i.e. molar ratio of citric acid : metal, phase contact time, initial solution concentration on the process efficiency was investigated. The highest efficiency of La(III) ions recovery was obtained for the molar ratio of citric acid : metal equal to 1 : 1 and the phase contact time equal to 120 minutes. In order to determine the kinetic and equilibrium parameters of the sorption process, the kinetic pseudo-first and pseudo-second order equations as well as the Langmuir and Freundlich isotherm models were used. The results indicate that the ion exchangers Lewatit TP207 and Purolite S950 are promising materials in the recovery of La(III) and Ni(II) ions from wastewaters. 
Work financed by NCBiR as part of the project no. POIR.04.01.01—00-0040/17.
1.	Alexandratos, S. D. Design and development of polymer-based separations: dual mechanism bifunctional polymers as a new category of metal ion complexing agents with enhanced ionic recognition // Sep Purif Methods.-1988.-17. 67-102.
2.	Dabrowski, A., Hubicki, Z., Podkościelny, P., Robens, E. Selective removal of the heavy metal ions from waters and industrial wastewaters by ion-exchange method // Chemosphere.-2004.-56. 91–106. 
3.	Chouyyok W., Pittman J. W., Warner M. G., Nell K. M., Clubb D. C., Gill G. A., Addleman R. S. Surface functionalized nanostructured ceramic sorbents for the effective collection and recovery of uranium from seawater // Dalton Trans.-2016.-45. 11312–11325.