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<p>Polyacrylonitrile-2-aminopyridine (PAN-TAP) is a novel chelating fiber rapidly prepared by microwave-assisted synthesis method. The optimal synthesis conditions are microwave power of 800&#xa0;W, reaction at 140 ℃ for 20&#xa0;min. Fourier transform infrared spectroscopy (FT-IR) shows nucleophilic addition reaction between cyanide and 2-aminopyridine in PAN fibers. thermogravimetric analysis (TGA) shows that the synthesized material is stable within 200 ℃. Scanning electron microscopy (SEM) shows that synthetic materials have a larger diameter and a very rough surface compared to PAN fibers. The synthesized materials were also characterized by elemental analysis, energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Meanwhile, the adsorption characteristics and mechanism of PAN-TAP for Cr(Ⅵ) were evaluated. When the pH of the solution is 2, the adsorption capacity of Cr (Ⅵ) is the highest and it has good separation ability, with a maximum separation coefficient of <i>β</i><sub><i>Cr/Ni</i></sub> = 357.75. The adsorption process conforms to the Langmuir isothermal adsorption model and the pseudo-second-order kinetic model, indicating that the adsorption mechanism is a chemisorption of monolayer adsorption. Cr(Ⅵ) is reduced to Cr(Ⅲ) by the amino groups on the fiber and then adsorbed. The maximum theoretical adsorption capacity is 287.1&#xa0;mg/g (at 298&#xa0;K), and the adsorption equilibrium can be reached within 1&#xa0;h. The thermodynamic parameter Δ<i>H</i> &gt; 20&#xa0;kJ·mol<sup>− 1</sup> indicates that adsorption is a spontaneous endothermic process. PAN-TAP fibers can be eluted with hydrochloric acid and reused. Overall, PAN-TAP is a cost-effective and rapid adsorbent, which has broad application prospects for the removal of Cr(Ⅵ) in water.</p>

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Microwave-assisted synthesis of A novel modified polyacrylonitrile fiber and its adsorption performance for Cr(Ⅵ)

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Jionghui Li,
  • Weiquan Zhang,
  • Qing Chen,
  • Chunhua Xiong

摘要

Polyacrylonitrile-2-aminopyridine (PAN-TAP) is a novel chelating fiber rapidly prepared by microwave-assisted synthesis method. The optimal synthesis conditions are microwave power of 800 W, reaction at 140 ℃ for 20 min. Fourier transform infrared spectroscopy (FT-IR) shows nucleophilic addition reaction between cyanide and 2-aminopyridine in PAN fibers. thermogravimetric analysis (TGA) shows that the synthesized material is stable within 200 ℃. Scanning electron microscopy (SEM) shows that synthetic materials have a larger diameter and a very rough surface compared to PAN fibers. The synthesized materials were also characterized by elemental analysis, energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Meanwhile, the adsorption characteristics and mechanism of PAN-TAP for Cr(Ⅵ) were evaluated. When the pH of the solution is 2, the adsorption capacity of Cr (Ⅵ) is the highest and it has good separation ability, with a maximum separation coefficient of βCr/Ni = 357.75. The adsorption process conforms to the Langmuir isothermal adsorption model and the pseudo-second-order kinetic model, indicating that the adsorption mechanism is a chemisorption of monolayer adsorption. Cr(Ⅵ) is reduced to Cr(Ⅲ) by the amino groups on the fiber and then adsorbed. The maximum theoretical adsorption capacity is 287.1 mg/g (at 298 K), and the adsorption equilibrium can be reached within 1 h. The thermodynamic parameter ΔH > 20 kJ·mol− 1 indicates that adsorption is a spontaneous endothermic process. PAN-TAP fibers can be eluted with hydrochloric acid and reused. Overall, PAN-TAP is a cost-effective and rapid adsorbent, which has broad application prospects for the removal of Cr(Ⅵ) in water.