{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T09:24:10Z","timestamp":1787217850090,"version":"build-2736575974"},"reference-count":34,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T00:00:00Z","timestamp":1787184000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan","award":["BR27101179"],"award-info":[{"award-number":["BR27101179"]}]},{"award":["BR27101179"],"award-info":[{"award-number":["BR27101179"]}],"id":[{"id":"https:\/\/ror.org\/05tyne317","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>Selective recovery of gold from cyanide leach liquors is hindered by the co-dissolution of iron minerals that generate ferrocyanide complexes which strongly compete with [Au(CN)2]\u2212 at ion-exchange sorbents. Here, we investigate mixed-bed interpolymer systems (IPS) composed of a strong-acid sulfonated polystyrene\u2013divinylbenzene cation exchanger (TC007, Na+ form) and a strong-base quaternary ammonium anion exchanger (AV-17-8, Cl\u2212 form) as a charge-selective platform for gold cyanide recovery. IPS compositions spanning cation-to-anion molar ratios from 6:0 to 0:6 were evaluated in batch contact with binary model solutions containing 30 mg L\u22121 each of [Au(CN)2]\u2212 and [Fe(CN)6]4\u2212 at pH 10 and 25 \u00b0C. The optimal 1:5 IPS achieved an [Au(CN)2]\u2212 extraction degree of 79.88% and a selectivity coefficient \u03b2 = DAu\/DFe = 4.95 at 48 h, whereas the pure AV-17-8 anion exchanger (0:6) reached only 37.55% Au extraction at 48 h, following an atypical delayed-uptake kinetic profile rather than the rapid, near-quantitative capture expected of an unmodified strong-base resin. Sorption kinetics were best described by a pseudo-second-order model (R2 = 0.9992), confirming ion exchange at quaternary ammonium sites as the dominant rate-controlling step, with a ~30-fold increase in k2 for [Au(CN)2]\u2212 in the 1:5 IPS relative to AV-17-8 alone. FTIR spectroscopy and TGA-DSC revealed the incorporation of metal cyanide complexes into the IPS matrix, with diagnostic C\u2261N stretching bands at 2108.7 and 2034.1 cm\u22121 and an additional thermal event at 200\u2013280 \u00b0C. These findings establish compositionally tunable IPS based on commercially available resins as a charge-selective sorbent platform demonstrating a capacity to regenerate under single-cycle elution conditions for gold cyanide recovery from ferrocyanide-containing process streams while highlighting the need for further evaluation under industrial Fe:Au ratios.<\/jats:p>","DOI":"10.3390\/polym18162016","type":"journal-article","created":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T08:10:20Z","timestamp":1787213420000},"page":"2016","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Compositionally Tunable Interpolymer System for Charge-Selective Recovery of Gold Cyanide from Ferrocyanide-Rich Solutions"],"prefix":"10.3390","volume":"18","author":[{"given":"Meruyert","family":"Suleimenova","sequence":"first","affiliation":[{"name":"Bekturov Institute of Chemical Sciences, 106 Sh. Ualikhanov Street, Almaty 050010, Kazakhstan"},{"name":"Faculty of Natural Sciences and Geography, Abai Kazakh National Pedagogical University, 13 Dostyk Ave., Almaty 050010, Kazakhstan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Talkybek","family":"Jumadilov","sequence":"additional","affiliation":[{"name":"Bekturov Institute of Chemical Sciences, 106 Sh. Ualikhanov Street, Almaty 050010, Kazakhstan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Juozas","family":"Gra\u017eulevi\u010dius","sequence":"additional","affiliation":[{"name":"Department of Polymer Chemistry and Technology, Kaunas University of Technology, 73 K. Donelaicio Street, 44249 Kaunas, Lithuania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5138-5997","authenticated-orcid":false,"given":"Khuangul","family":"Khimersen","sequence":"additional","affiliation":[{"name":"Bekturov Institute of Chemical Sciences, 106 Sh. Ualikhanov Street, Almaty 050010, Kazakhstan"},{"name":"Faculty of Natural Sciences and Geography, Abai Kazakh National Pedagogical University, 13 Dostyk Ave., Almaty 050010, Kazakhstan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meruyert","family":"Mukanova","sequence":"additional","affiliation":[{"name":"Bekturov Institute of Chemical Sciences, 106 Sh. Ualikhanov Street, Almaty 050010, Kazakhstan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,8,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"(2005). Gold 2006 New Industrial Applications of Gold. Gold Bull., 38, 152.","DOI":"10.1007\/BF03215252"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Bleischwitz, R., Welfens, P.J.J., and Zhang, Z. (2011). Sustainable Resource Management in the Production Chain of Precious and Special Metals. 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