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Magnetic tin metal-organic frameworks (MSn-MOFs) effectively remove the insecticide amoxicillin (AMX) from water. This study demonstrates MSn-MOFs as a highly efficient and reusable adsorbent for water purification and industrial effluent treatment.

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Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Adsorption Science

Background:

  • Amoxicillin (AMX) is a common insecticide pollutant in aqueous solutions.
  • Effective removal of AMX is crucial for environmental protection and water safety.

Purpose of the Study:

  • To investigate the efficacy of magnetic Sn metal-organic frameworks (MSn-MOFs) as adsorbents for amoxicillin removal.
  • To characterize MSn-MOFs and understand the adsorption mechanism and influencing factors.

Main Methods:

  • Material characterization using BET, magnetic force measurements, and point of zero charge determination.
  • Adsorption experiments exploring the effects of pH and kinetic modeling.
  • Langmuir isotherm analysis and thermodynamic studies.
  • Adsorbent regeneration tests and optimization using Box-Behnken design.

Main Results:

  • MSn-MOFs exhibit a high surface area (880 m² g⁻¹) and magnetic force (89.26 emu g⁻¹).
  • The adsorption process follows pseudo-second-order kinetics and the Langmuir isotherm, indicating chemisorption.
  • The maximum adsorption capacity is 2.75 mmol g⁻¹ at pH 6.
  • The adsorbent demonstrated high efficiency and recyclability over six cycles.

Conclusions:

  • MSn-MOFs are a highly effective and reusable adsorbent for amoxicillin removal from aqueous solutions.
  • The adsorption mechanism involves chemisorption, potentially through pore filling, H-bonding, π-π, or electrostatic interactions.
  • MSn-MOF technology offers a promising solution for water filtration and industrial effluent treatment.