Versatile polycationic imidazolium hyper-crosslinked polymers for efficient removal of radioactive iodide and adsorption of metallo-anions
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Issued Date
2026-02-26
Resource Type
ISSN
13835866
eISSN
18733794
Scopus ID
2-s2.0-105020788217
Journal Title
Separation and Purification Technology
Volume
382
Rights Holder(s)
SCOPUS
Bibliographic Citation
Separation and Purification Technology Vol.382 (2026)
Suggested Citation
Junthod K., Srisawat P., Laoviwat P., Watanabe N., Tangsasom P., Srevattanangkul A., Kaeopookum P., Sangtawesin T., Todee B., Shigeta Y., Hengphasartporn K., Tantirungrotechai J., Bunchuay T. Versatile polycationic imidazolium hyper-crosslinked polymers for efficient removal of radioactive iodide and adsorption of metallo-anions. Separation and Purification Technology Vol.382 (2026). doi:10.1016/j.seppur.2025.135782 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/114718
Title
Versatile polycationic imidazolium hyper-crosslinked polymers for efficient removal of radioactive iodide and adsorption of metallo-anions
Corresponding Author(s)
Other Contributor(s)
Abstract
In support of Sustainable Development Goal 6 (Clean Water and Sanitation), we report the synthesis of polycationic imidazolium hyper-crosslinked polymers (P-Imi∙X, X = OTs, Cl, Br, I) as efficient adsorbents for hazardous anionic contaminants. The parent material, P-Imi∙OTs, was prepared via one-step nucleophilic substitution of tosylated hyper-crosslinked polymers (P-OTs), followed by anion exchange. Structural and physicochemical properties were comprehensively characterized using FTIR, MAS <sup>13</sup>C NMR, TGA, zeta potential, CHNS, XRF, and SEM analyses. These materials exhibited rapid and high-capacity adsorption of diverse anionic pollutants, including organic dyes, metallo-anions, and radioactive iodide (<sup>131</sup>I<sup>−</sup>). Mechanistic insights from <sup>1</sup>H NMR and DFT calculations reveal that anion binding is driven by charge-assisted hydrogen bonding and electrostatic interactions at the densely functionalized imidazolium-rich surfaces. P-Imi∙OTs achieved an adsorption capacity of 861 mg·g<sup>−1</sup> for methyl orange and 198 mg·g<sup>−1</sup> for KAuCl₄ within 6 min. Notably, P-Imi∙Cl exhibited the highest uptake of radioactive Na<sup>131</sup>I at 1.31 GBq·g<sup>−1</sup>. These results highlight the potential of polycationic imidazolium HCPs as scalable, fast-acting, and versatile adsorbents for industrial wastewater treatment and radioactive waste remediation.