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MIL-101(Fe)-derived porous amorphous materials for efficient Congo red adsorption.

Zhongben Zhou1, Changfeng Zeng2, Lixiong Zhang1

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|May 15, 2025
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Amorphization of MIL-101(Fe) using 2-methylimidazole created porous materials with significantly enhanced Congo red adsorption. These materials achieved a high adsorption capacity of 7078 mg g⁻¹, demonstrating excellent stability and reusability.

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) like MIL-101(Fe) are effective adsorbents.
  • Amorphization can alter material properties, potentially improving performance.
  • Congo red (CR) is a common pollutant requiring efficient removal methods.

Purpose of the Study:

  • To prepare novel porous amorphous materials derived from MIL-101(Fe).
  • To investigate the adsorption performance of these materials for Congo red.
  • To understand the factors influencing adsorption and the underlying mechanisms.

Main Methods:

  • Synthesis of porous amorphous materials using MIL-101(Fe) and 2-methylimidazole (2-MelM).
  • Characterization via SEM, XRD, BET, FT-IR, and XPS.
  • Adsorption experiments evaluating dye concentration, pH, temperature, and time effects.

Main Results:

  • Amorphization significantly enhanced CR adsorption capacity compared to pristine MIL-101(Fe).
  • Optimal conditions yielded a maximum adsorption capacity of 7078 mg g⁻¹.
  • Langmuir model indicated monolayer adsorption with a saturated capacity of 7095 mg g⁻¹.
  • Materials exhibited high stability and reusability.

Conclusions:

  • Amorphization of MIL-101(Fe) is an effective strategy to boost Congo red adsorption.
  • The developed materials show superior performance and stability for dye removal.
  • Hydrogen bonding, electrostatic, and π-π interactions are key to the adsorption mechanism.