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<p>A magnetic double-layer metal-organic framework composite (Fe<sub>3</sub>O<sub>4</sub>@ZIF-8@ZIF-67) was successfully synthesized through a facile layer-by-layer self-assembly method at room temperature and thoroughly characterized using various techniques. The composite Fe<sub>3</sub>O<sub>4</sub>@ZIF-8@ZIF-67 was explored as an adsorbent for the removal of two harmful organic pollutants, Congo red (CR) and tetracycline hydrochloride (TC). Some essential parameters, including initial concentration, adsorbent dose, contact time, pH, and temperature, were systematically optimized. Under optimal conditions, Fe<sub>3</sub>O<sub>4</sub>@ZIF-8@ZIF-67 demonstrated the maximum adsorption capacities of 276.77&#xa0;mg/g for CR and and 356.12&#xa0;mg/g for TC, respectively. The double-layer structure endowed Fe<sub>3</sub>O<sub>4</sub>@ZIF-8@ZIF-67 high adsorption efficiency for CR (99.44%) than the pristine Fe<sub>3</sub>O<sub>4</sub>@ZIF-8 (73.26%). Adsorption kinetics and isotherms studies revealed that the adsorption process followed pseudo-second-order kinetics and Langmuir model, indicating a monolayer chemisorption-dominated mechanism. Furthermore, the spent Fe<sub>3</sub>O<sub>4</sub>@ZIF-8@ZIF-67 was regenerated through a Fenton-like oxidative degradation reaction, maintaining a removal efficiency above 70% after three consecutive cycles. With its facile synthesis, cost-effectiveness, mild operating conditions, and high selectivity for anionic dyes, Fe<sub>3</sub>O<sub>4</sub>@ZIF-8@ZIF-67 emerges as a highly promising material for advanced wastewater treatment applications.</p>

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Magnetic double-layer MOF nanocomposites Fe3O4@ZIF-8@ZIF-67 for efficient adsorptive removal of organic dye and antibiotic

  • 期刊论文

  • 发表日期：

    2025年10月11日

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  • Jiaru Huang,
  • Jinhuan Li,
  • Chunmiao Lu,
  • Xu Wang,
  • Jingjing Xu

摘要

A magnetic double-layer metal-organic framework composite (Fe3O4@ZIF-8@ZIF-67) was successfully synthesized through a facile layer-by-layer self-assembly method at room temperature and thoroughly characterized using various techniques. The composite Fe3O4@ZIF-8@ZIF-67 was explored as an adsorbent for the removal of two harmful organic pollutants, Congo red (CR) and tetracycline hydrochloride (TC). Some essential parameters, including initial concentration, adsorbent dose, contact time, pH, and temperature, were systematically optimized. Under optimal conditions, Fe3O4@ZIF-8@ZIF-67 demonstrated the maximum adsorption capacities of 276.77 mg/g for CR and and 356.12 mg/g for TC, respectively. The double-layer structure endowed Fe3O4@ZIF-8@ZIF-67 high adsorption efficiency for CR (99.44%) than the pristine Fe3O4@ZIF-8 (73.26%). Adsorption kinetics and isotherms studies revealed that the adsorption process followed pseudo-second-order kinetics and Langmuir model, indicating a monolayer chemisorption-dominated mechanism. Furthermore, the spent Fe3O4@ZIF-8@ZIF-67 was regenerated through a Fenton-like oxidative degradation reaction, maintaining a removal efficiency above 70% after three consecutive cycles. With its facile synthesis, cost-effectiveness, mild operating conditions, and high selectivity for anionic dyes, Fe3O4@ZIF-8@ZIF-67 emerges as a highly promising material for advanced wastewater treatment applications.