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<p>To efficiently separate Co (II) from aqueous solutions and address the issues of difficult recycling and insufficient adsorption performance of traditional adsorbents, this study used polyacrylonitrile nanofibers (PAN/NFs) as the matrix and prepared an amino-functionalized adsorbent (PAN/NFs@NH<sub>2</sub>) via graft modification with triethylenetetramine (TETA). The structural characteristics and Co (II) adsorption performance of PAN/NFs@NH<sub>2</sub> were investigated, and the material was characterized via SEM, EDS, FTIR, BET, XPS, and CA. PAN/NFs@NH<sub>2</sub> exhibits advantages of easy recyclability, excellent physicochemical stability, and good hydrophilicity. Static adsorption experiments showed that the optimal conditions for Co(II) adsorption by PAN/NFs@NH<sub>2</sub> are pH = 8 and a contact time of 12&#xa0;h; under these circumstances, the equilibrium adsorption capacity reaches 48.30&#xa0;mg/g, and the highest measured adsorption capacity is 158.29&#xa0;mg/g (the Langmuir-fitted theoretical maximum capacity qm = 173.9&#xa0;mg/g). The adsorption process follows the Langmuir monolayer adsorption model and is an endothermic and spontaneous process. PAN/NFs@NH<sub>2</sub> exhibits selective adsorption for Co(II), with selectivity coefficients of 1.73, 156.5, and 194.1 for Ni(II), Li(I), and Mn(II). Following 5 adsorption–desorption cycles, its adsorption capacity still retains around 70% of the initial value. XPS analysis confirmed that the adsorption mechanism involves the formation of coordination bonds between Co (II) and nitrogen atoms in amino groups (-NH<sub>2</sub>, -NH-), where nitrogen atoms donate their lone pairs of electrons to Co (II). In conclusion, PAN/NFs@NH<sub>2</sub> provides an efficient, stable, and easily recyclable fiber-based adsorbent for the treatment of Co (II)-containing wastewater.</p>

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Study on the Separation of Co(II) Ions by Triethylenetetramine-Modified Polyacrylonitrile Nanofibers

  • 期刊论文

  • 发表日期：

    2026年1月24日

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  • Yang Luo,
  • Shuyuan Liu,
  • Weiwei Li,
  • Guangchuan He,
  • Guangfu Chen,
  • Xianchen Huang,
  • Xiangyang Niu,
  • Jiahui Ruan,
  • Linlin Huang,
  • Guoyuan Yuan

摘要

To efficiently separate Co (II) from aqueous solutions and address the issues of difficult recycling and insufficient adsorption performance of traditional adsorbents, this study used polyacrylonitrile nanofibers (PAN/NFs) as the matrix and prepared an amino-functionalized adsorbent (PAN/NFs@NH2) via graft modification with triethylenetetramine (TETA). The structural characteristics and Co (II) adsorption performance of PAN/NFs@NH2 were investigated, and the material was characterized via SEM, EDS, FTIR, BET, XPS, and CA. PAN/NFs@NH2 exhibits advantages of easy recyclability, excellent physicochemical stability, and good hydrophilicity. Static adsorption experiments showed that the optimal conditions for Co(II) adsorption by PAN/NFs@NH2 are pH = 8 and a contact time of 12 h; under these circumstances, the equilibrium adsorption capacity reaches 48.30 mg/g, and the highest measured adsorption capacity is 158.29 mg/g (the Langmuir-fitted theoretical maximum capacity qm = 173.9 mg/g). The adsorption process follows the Langmuir monolayer adsorption model and is an endothermic and spontaneous process. PAN/NFs@NH2 exhibits selective adsorption for Co(II), with selectivity coefficients of 1.73, 156.5, and 194.1 for Ni(II), Li(I), and Mn(II). Following 5 adsorption–desorption cycles, its adsorption capacity still retains around 70% of the initial value. XPS analysis confirmed that the adsorption mechanism involves the formation of coordination bonds between Co (II) and nitrogen atoms in amino groups (-NH2, -NH-), where nitrogen atoms donate their lone pairs of electrons to Co (II). In conclusion, PAN/NFs@NH2 provides an efficient, stable, and easily recyclable fiber-based adsorbent for the treatment of Co (II)-containing wastewater.