Polyelectrolyte complex-derived adsorbent capsules capable of selective recovery of precious metal from multiple mixtures
- Authors
- Bediako, J.K.; Lim, C.-R.; Repo, E.; Choi, S.-H.; Yun, Y.-S.
- Issue Date
- 15-Jun-2023
- Publisher
- Elsevier Ltd
- Keywords
- Coacervates; Competing ions; Gold selectivity; PEC capsules; Polyelectrolyte complexes
- Citation
- Chemical Engineering Science, v.274
- Journal Title
- Chemical Engineering Science
- Volume
- 274
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/31086
- DOI
- 10.1016/j.ces.2023.118688
- ISSN
- 0009-2509
1873-4405
- Abstract
- Polyelectrolyte complexes (PECs) are valuable functional materials for many industrial applications, yet it is difficult to augment their morphologies for desired applications. Herewith, PEC capsules were strategically fabricated via salt-induced coacervation of poly(diallyldimethylammonium chloride) and poly(styrenesulfonate). The adsorbents showed Au(III) selectivity in multimetal mixtures of Au-Pt-Pd and Au-Cu-Co-Zn. The binding sites were offered by R4N+ through electrostatic attraction, as elucidated with XPS. Selectivity was influenced by concentration, contact time and stirring speed. A new phenomenon of competing ion rejection was established to be caused by combined Au(III)/water penetration into the capsules, leading to decrease in bulk solution volume at equilibrium. The maximum Au(III) uptake was 176.63 ± 15.57 and 110.84 ± 2.32 mg/g for the Au-Pt-Pd and Au-Cu-Co-Zn systems, achievable within ∼ 1 and > 6 h, respectively. The loaded Au(III) was eluted with 0.1 M thiourea and regenerated for at least five cycles, making it practically feasible for resource recovery through urban mining. © 2023 The Author(s)
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