Development of a new ion-imprinted polymer (IIP) with Cd2+ ions based on divinylbenzene copolymers containing amidoxime groups

• Published in: Polymer bulletin (Berlin, Germany) Vol. 77; no. 4; pp. 1969 - 1981
• Main Authors: Gomes, A. C. S. A., Costa, L. C., Brito, D. C., França, R. J., Marques, Mônica R. C.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-04-2020; Springer Nature B.V
• Subjects: Adsorption; Cadmium; Characterization and Evaluation of Materials; Chemical synthesis; Chemistry; Chemistry and Materials Science; Complex Fluids and Microfluidics; Copolymers; Copper; Divinylbenzene; Imprinted polymers; Lead; Organic Chemistry; Original Paper; Physical Chemistry; Polymer Sciences; Polymerization; Polymers; Polyvinyl alcohol; Scanning electron microscopy; Scientific imaging; Selectivity; Soft and Granular Matter; Sorption; Suspension polymerization; Cadmium; Porous materials; Ion-imprinted polymer
• ISSN: 0170-0839; 1436-2449
• DOI: 10.1007/s00289-019-02842-8

In this study, we synthesized a new ion-imprinted polymer (IIP) based on introduction of amidoxime groups in acrylonitrile, complexation with Cd
2+
ions and polymerization with styrene and divinylbenzene by aqueous suspension polymerization. A non-imprinting polymer (NIP) was also synthesized. The adsorption tests of Cd
2+
by IIP were performed by varying the pH, Cd
2+
ion concentrations and contact time between the ions and the IIP. Kinetic models and adsorption isotherms were applied to evaluate the behavior of the IIP. The optimum conditions for Cd
2+
adsorption by IIP were pH 6.0 and equilibrium time of 12 min. The increase in initial concentration of the Cd
2+
ions resulted in an increased sorption capacity,
qe
. The Elovich and Freundlich were the most appropriate models to describe the sorption equilibrium and the sorption mechanism, respectively. Selectivity studies were conducted in the presence of Zn
2+
, Pb
2+
, Cu
2+
and Ni
2+
. The selectivity results showed that the NIP was not selective for Cd
2+
ions and the IIP was selective for Cd
2+
ions in relation to ions of Zn
2+
, Cu
2+
and Ni
2+
, but not in relation to Pb
2+
ions.