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<p>This study explores the dual incorporations of ZIF-8 (zeolitic imidazolate framework-8) and hydrochar into CNF (cellulose nanofibril)-based membranes to enhance their adsorption and filtration performance. ZIF-8 immobilization and hydrothermal treatment on TOCN (TEMPO-mediated oxidized cellulose nanofibril) increased the surface area, induced heterogeneous pore distribution, and introduced diverse driving forces for adsorption. The adsorption behaviors of the membranes were studied using three different model dyes, i.e. MB (methylene blue) as a cationic dye, MO (methyl orange) as an anionic dye, and VB12 (vitamin B12) as a zwitterionic dye. The dual treated membrane exhibited significantly improved adsorption capacities, achieving up to 166.2, 89.1, and 80.5&#xa0;mg/g in 10&#xa0;ppm&#xa0;MB, MO, and VB12 solutions, respectively. Additionally, the integration of ZIF-8 and hydrochar facilitated effective removal of antibiotics (tetracycline and norfloxacin) by filtration, achieving removal rates above 93%. These results represent one of the highest adsorption and filtration capacities recorded among cellulose-based adsorbents to date. The synergistic impacts of structures and extra driving forces provided better removal performances by adsorption and filtration toward model dyes and antibiotics, simultaneously.</p>

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Dual incorporations of ZIF-8 and hydrochar on CNF membrane for superior removal performance toward various pollutants

  • 期刊论文

  • 发表日期：

    2025年6月13日

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  • Eunseok Yang,
  • SeungMin Lee,
  • Suhnue Kim,
  • Yeji Park,
  • Hyunmyung Park,
  • Hyungsup Kim

摘要

This study explores the dual incorporations of ZIF-8 (zeolitic imidazolate framework-8) and hydrochar into CNF (cellulose nanofibril)-based membranes to enhance their adsorption and filtration performance. ZIF-8 immobilization and hydrothermal treatment on TOCN (TEMPO-mediated oxidized cellulose nanofibril) increased the surface area, induced heterogeneous pore distribution, and introduced diverse driving forces for adsorption. The adsorption behaviors of the membranes were studied using three different model dyes, i.e. MB (methylene blue) as a cationic dye, MO (methyl orange) as an anionic dye, and VB12 (vitamin B12) as a zwitterionic dye. The dual treated membrane exhibited significantly improved adsorption capacities, achieving up to 166.2, 89.1, and 80.5 mg/g in 10 ppm MB, MO, and VB12 solutions, respectively. Additionally, the integration of ZIF-8 and hydrochar facilitated effective removal of antibiotics (tetracycline and norfloxacin) by filtration, achieving removal rates above 93%. These results represent one of the highest adsorption and filtration capacities recorded among cellulose-based adsorbents to date. The synergistic impacts of structures and extra driving forces provided better removal performances by adsorption and filtration toward model dyes and antibiotics, simultaneously.