FEATURES OF GOLD ION EXTRACTION BY THE INTERPOLYMER SYSTEM KU-2-8 AND POLY-4-VINYLPYRIDINA

The demand for effective methods of extracting valuable components from waste solutions is increasing every year [1]. For example, the extraction of Au (III) from complex sources is associated with significant difficulties. In our study, we used interpolymer systems based on ion exchange resins KU-2-8 and poly-4-vinylpyridine, obtained from solutions containing gold ions. The purpose. Of the work is to study the sorption properties of industrial ion exchange resins KU-2-8 and P4VP with respect to gold ions. The obtained results. In the interpolymer systems KU-2-8- P4VP in the ratio of 5:1 after 48 hours, a decrease in the concentration of cations remaining in the solution is observed from 130 mg/l to 99 mg/l. The optimal amount of sorbed gold ions was recorded at the ion exchanger ratio of 2:4 and amounted to 45%. The maximum sorption values were maintained at the ratio of 5:1 throughout the entire interaction time (0.5; 1.5; 6; 24 and 48 hours). High values of the parameter were observed at the initial stage of the interaction of the interpolymer systems at 1.5 hours, the degree of sorption amounted to 135 mg/l, respectively. As a result of the interaction of polymers at ratios of 2:4 and 1:5, the degree of sorption increased several times. The degree of sorption after 48 hours of interaction at a ratio of 1:5 reached 41.57%. In the individual anion exchanger P4VP (0:6) it increased by 44.22%. The degree of sorption was 13.2% higher compared to individual interpolymer systems. The proposed mechanism of interaction of ion-exchange resins in an aqueous medium as an interpolymer system "KU2-8- P4VP" (X:Y) was confirmed by Pearson's theory of hard and soft acids and bases (HSAB). Conclusion. The obtained results of the study showed that the activation of ion-exchange resins in the interpolymer pair leads to a significant increase in their sorption capacity. At the initial stage of interaction, it was proven that the concentration of gold ions remaining in the solution was higher compared to other ions. The processes of interaction of the interpolymer system KU-2-8-P4VP with gold ions had different values depending on time.