Selective Sorption of Gold Ions from Iron-Rich Solutions Using a Dual-Phase Interpolymer System
Jumadilov T. Suleimenova M. Gražulevičius J.V.
June 2025Engineered Science Publisher
Engineered Science
2025#35
This study investigates the selective sorption of gold(I) ions from binary gold-iron solutions using the interpolymer system Amberlite IR120:AV-17-8. The system leverages remote interactions between cationic and anionic resins to enhance gold selectivity. Amberlite IR120 (H+ form) and AV-17-8 (OH- form) were evaluated at molar ratios of 6:0, 5:1, 4:2, 3:3, 2:4, 1:5, and 0:6. Sorption characteristics were analyzed using gravimetry, inductively coupled plasma optical emission spectroscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis and scanning electron microscopy. The optimized 4:2 ratio exhibited the highest gold selectivity, achieving 96.26% sorption after 48 hours, while iron sorption remained at 42.33%. In contrast, Amberlite IR120 (6:0) showed negligible sorption (~3%), whereas AV-17-8 (0:6) reached 91.9% for gold and 92.33% for iron. Desorption with 9% thiourea and 2% sulfuric acid yielded 92.28% gold recovery and 46.44% iron recovery at the 4:2 ratio, which correlates with the high sorption efficiency. Based on calculations per mole of anion exchanger, the highest gold sorption was 18.45 mg/L at a 5:1 ratio, 301% higher than the 4.60 mg/L at a 0:6 ratio and gold desorption peaked at 15.4 mg/L at a 5:1 ratio, 266.67% higher than the 4.20 mg/L at a 0:6. These findings demonstrate that optimizing cation-anion ratios significantly enhances gold recovery. The systems efficiency is attributed to remote interactions and enhanced ion exchange, as analyzed using Pearson’s Hard and Soft Acids and Bases theory.
Gold ions , Interpolymer system , Iron ions , Remote interaction effect , Sorption kinetics
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Bekturov Institute of Chemical Sciences, 106 Sh. Ualikhanov Str., Almaty, 050010, Kazakhstan
Faculty of Natural Sciences and Geography, Abai Kazakh National Pedagogical University, 13 Dostyk Ave., Almaty, 050010, Kazakhstan
Department of Polymer Chemistry and Technology, Kaunas University of Technology, 73 K. Donelaičio Street, Kaunas, 44249, Lithuania
Bekturov Institute of Chemical Sciences
Faculty of Natural Sciences and Geography
Department of Polymer Chemistry and Technology
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