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<p>Enhancing the adsorption capacity of electrospun nanofiber membranes is crucial for efficient dye removal from wastewater. Here, this is addressed by incorporating montmorillonite (MMT) into polyacrylonitrile/polyvinylpyrrolidone (PAN/PVP) nanofibers to form PAN/PVP/MMT composite membranes. The nanocomposites were fabricated by electrospinning PAN/PVP solutions with different MMT loadings, followed by hot-water immersion and thermal stabilization. Structural and morphological characterization (X-ray diffraction, Fourier transform infrared spectroscopy, field-emission scanning electron microscopy/energy-dispersive X-ray spectroscopy, and thermogravimetric analysis) confirmed successful MMT incorporation. Batch adsorption experiments using methylene blue (MB, cationic) and Congo red (CR, anionic) showed that the optimal PAN/PVP/MMT7 membrane achieved equilibrium capacities of 38.2&#xa0;mg/g for MB and 26.8&#xa0;mg/g for CR, corresponding to ~ 3.8-fold and ~ 1.4-fold improvements over neat PAN/PVP. Kinetic data followed a pseudo-second-order model, and isotherm analysis indicated Langmuir behavior for MB, whereas CR was described comparably by both models. The pronounced selectivity for cationic MB over anionic CR arises from the permanent negative (cation-exchange) charge of montmorillonite together with the membrane’s point of zero charge, consistent with the pH-dependent adsorption, and the spent membrane was partially regenerable by NaCl. These results demonstrate enhanced adsorption capacity and charge-selective dye removal.</p>

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Electrospun PAN/PVP/montmorillonite nanofiber membranes for enhanced adsorption of methylene blue and congo red from aqueous solutions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月9日

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  • Muhammad Yasin Siregar,
  • Alex Triputra Lumban Tobing,
  • Quratul Aini,
  • Agita Phasa,
  • Mochammad Ghulam Isaq Khan,
  • Anisa Fitri,
  • Aditya Rianjanu

摘要

Enhancing the adsorption capacity of electrospun nanofiber membranes is crucial for efficient dye removal from wastewater. Here, this is addressed by incorporating montmorillonite (MMT) into polyacrylonitrile/polyvinylpyrrolidone (PAN/PVP) nanofibers to form PAN/PVP/MMT composite membranes. The nanocomposites were fabricated by electrospinning PAN/PVP solutions with different MMT loadings, followed by hot-water immersion and thermal stabilization. Structural and morphological characterization (X-ray diffraction, Fourier transform infrared spectroscopy, field-emission scanning electron microscopy/energy-dispersive X-ray spectroscopy, and thermogravimetric analysis) confirmed successful MMT incorporation. Batch adsorption experiments using methylene blue (MB, cationic) and Congo red (CR, anionic) showed that the optimal PAN/PVP/MMT7 membrane achieved equilibrium capacities of 38.2 mg/g for MB and 26.8 mg/g for CR, corresponding to ~ 3.8-fold and ~ 1.4-fold improvements over neat PAN/PVP. Kinetic data followed a pseudo-second-order model, and isotherm analysis indicated Langmuir behavior for MB, whereas CR was described comparably by both models. The pronounced selectivity for cationic MB over anionic CR arises from the permanent negative (cation-exchange) charge of montmorillonite together with the membrane’s point of zero charge, consistent with the pH-dependent adsorption, and the spent membrane was partially regenerable by NaCl. These results demonstrate enhanced adsorption capacity and charge-selective dye removal.