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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...

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Targeted Selenite Adsorption Using Defective Fe-BTC: Effective in Acidic and Alkaline Conditions.

Asong Byun1, Byeoksong Lee1, Yujin Jeong2

  • 1Department of Physics and Chemistry, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, 42988, Republic of Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|August 4, 2025
PubMed
Summary

Amorphous iron-based metal-organic framework (Fe-BTC) effectively removes toxic selenite anions from water. Its defective structure enables high adsorption capacity and selectivity across a wide pH range.

Keywords:
amorphous materialschemisorptionenvironmental chemistrymetal‐organic frameworksselenium

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemistry

Background:

  • Toxic selenite anions pose significant risks to aquatic ecosystems and human health.
  • Current methods for selenite removal often face challenges with efficiency, selectivity, and broad applicability.
  • Metal-organic frameworks (MOFs) show promise as adsorbents due to their tunable structures and high surface areas.

Purpose of the Study:

  • To investigate the efficacy of amorphous Fe-BTC in removing toxic selenite anions from aqueous solutions.
  • To explore the pH-dependent adsorption mechanisms and selectivity of Fe-BTC for selenite.
  • To compare the performance of amorphous Fe-BTC with crystalline Fe-MOF (MIL-100(Fe)).

Main Methods:

  • Synthesis and characterization of amorphous Fe-BTC with defective metal nodes.
  • Batch adsorption experiments to evaluate selenite removal efficiency and capacity across a wide pH range (2-12).
  • Analysis of adsorption mechanisms through investigation of chemical interactions at different pH values and assessment of selectivity against competing anions.

Main Results:

  • Amorphous Fe-BTC demonstrated high adsorption capacity for selenite (up to 491 mg g⁻¹), surpassing many existing adsorbents, including crystalline Fe-MOF.
  • Effective adsorption was maintained over a broad pH range (2-12), indicating robust performance.
  • Selenite adsorption exhibited strong selectivity over selenate and common inorganic anions due to its coordination ability.
  • Adsorption mechanisms varied with pH, involving weaker interactions in acidic conditions and stronger, diverse coordination in alkaline conditions.

Conclusions:

  • Amorphous Fe-BTC, owing to its defective metal nodes, is a highly effective and selective adsorbent for toxic selenite anions.
  • The pH-dependent adsorption behavior provides insights into optimizing removal strategies for various water conditions.
  • This study highlights the potential of defect-engineered MOFs for advanced water remediation applications.