Изучение сорбции ионов Сe(III) хелатообразующим синтетическим сорбентом на основании сополимера стирола с малеиновым ангидридом и м-аминофенола

Abstract

In the present article the results of a study for the sorption of cerium (III) ions by a chelating synthetic sorbent are presented. Based on a copolymer of styrene with maleic anhydride and m-aminophenol, a new polymer chelating sorbent was synthesised and its sorption characteristics were studied with respect to cerium (III) ions. The synthesis of the sorbent was carried out in the presence of formalin acting as a crosslinking agent. In the course of the studies, various parameters affecting sorption were determined: optimal pH value; ionic strength; the time of complete sorption equilibrium; the effect of the initial concentration of cerium (III) ions on the sorption process. Studies have shown the maximum sorption capacity of the sorbent with respect to cerium (III) ions to be equal to 540 mg/g at pH = 5. In the course of studying the influence of ionic strength on the sorption process up to a certain value of ionic strength (0.2-1.0 mol/L), the presence of K+ and Clions was established to have no effect on the sorption capacity of the sorbent. The reverse desorption process was also studied and the optimal eluent was established using various mineral acids of the same concentration: 0.5 M solutions of HCl, HNO3, H2SO4 and CH3COOH. HNO3 solution of the 0.5 mol/L concentration demonstrated the best desorption ability with respect to cerium ions. The structure of the synthesised sorbent and the presence of certain functional groups was investigated by IR spectroscopy in the region from 400 to 4000 cm -1 .