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<p>The purpose of this research was to synthesize a modified chitosan-based adsorbent for the selective adsorption of Cd(II) from a multi-solute system containing Ni(II) and Co(II) ions. Chitosan hydrogel beads were synthesized and modified through crosslinking and ion-imprinting reactions using environmentally friendly reagents to enhance the physicochemical properties, adsorption capacity, and metal ion selectivity. The resulting adsorbents were characterized using XRD, BET, and FTIR analyses, revealing changes in crystal structure and improvements in surface area after ion-imprinting. The performance of the synthesized adsorbents was evaluated in single- and multi-component batch adsorption systems containing Cd(II), Ni(II), and Co(II). Results indicated that the maximum adsorption capacity of the ion-imprinted crosslinked chitosan in a mono-component solution followed the order: Cd(II) (1.06 mmol/g) &gt; Co(II) (0.68 mmol/g) &gt; Ni(II) (0.38 mmol/g). Additionally, the modified chitosan achieved a higher total metal ion uptake (1.33 mmol/g) with improved selectivity for Cd(II) compared to non-imprinted crosslinked chitosan in a multi-component system. The adsorption mechanism was investigated using SEM–EDS and FTIR techniques, suggesting that the adsorption was governed by both chemical binding and ion exchange mechanisms in the ternary system.</p>

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Synthesis, Characterization, and Application of Ion-Imprinted Crosslinked Chitosan for Competitive Adsorption of Cd(II), Ni(II), and Co(II)

  • 期刊论文

  • 发表日期：

    2025年10月2日

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  • Ataollah Babakhani,
  • Majid Sartaj

摘要

The purpose of this research was to synthesize a modified chitosan-based adsorbent for the selective adsorption of Cd(II) from a multi-solute system containing Ni(II) and Co(II) ions. Chitosan hydrogel beads were synthesized and modified through crosslinking and ion-imprinting reactions using environmentally friendly reagents to enhance the physicochemical properties, adsorption capacity, and metal ion selectivity. The resulting adsorbents were characterized using XRD, BET, and FTIR analyses, revealing changes in crystal structure and improvements in surface area after ion-imprinting. The performance of the synthesized adsorbents was evaluated in single- and multi-component batch adsorption systems containing Cd(II), Ni(II), and Co(II). Results indicated that the maximum adsorption capacity of the ion-imprinted crosslinked chitosan in a mono-component solution followed the order: Cd(II) (1.06 mmol/g) > Co(II) (0.68 mmol/g) > Ni(II) (0.38 mmol/g). Additionally, the modified chitosan achieved a higher total metal ion uptake (1.33 mmol/g) with improved selectivity for Cd(II) compared to non-imprinted crosslinked chitosan in a multi-component system. The adsorption mechanism was investigated using SEM–EDS and FTIR techniques, suggesting that the adsorption was governed by both chemical binding and ion exchange mechanisms in the ternary system.