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Related Concept Videos

Extraction: Advanced Methods00:56

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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...
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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Related Experiment Video

Updated: Jul 5, 2025

Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide
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Arsenic removal adsorbent using limonite-polyethersulfone composite fiber via continuous flow column process.

Anh Phuong Le Thi1, Li Zhe2, Takaomi Kobayashi1,2

  • 1Department of Science and Technology Innovation, Nagaoka University of Technology, Nagaoka, Japan.

Water Environment Research : a Research Publication of the Water Environment Federation
|January 17, 2024
PubMed
Summary

This study developed polyethersulfone-limonite composite fibers for effective arsenic removal from water. These fibers show high adsorption capacity for both As(III) and As(V) in flow conditions.

Keywords:
arsenic removalcolumn adsorptionlimonite-PES-based composite fibrous adsorbent

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemical Engineering

Background:

  • Arsenic contamination in water poses significant health risks.
  • Developing efficient and cost-effective adsorbents for arsenic removal is crucial for water treatment.

Purpose of the Study:

  • To introduce an enhanced limonite-based composite fiber adsorbent for arsenic removal.
  • To investigate the adsorption performance and mechanism of polyethersulfone-limonite composite fibers for As(III) and As(V).

Main Methods:

  • Polyethersulfone (PES)-limonite composite fibers were fabricated using a wet-spinning process.
  • Adsorption experiments were conducted to evaluate As(III) and As(V) removal efficiency.
  • Langmuir and Adams-Bohart models were applied to analyze adsorption behavior and column performance.

Main Results:

  • The composite fiber with 10 wt% PES exhibited a porous structure and efficient arsenic absorption.
  • Adsorption followed the Langmuir model with qm values of 1.5 mg/g for As(III) and 3.2 mg/g for As(V) at pH 6.
  • Column experiments showed enhanced removal with increased contact time and fiber column height.

Conclusions:

  • Limonite composite fibers are effective for removing As(III) and As(V) at neutral pH.
  • The adsorption mechanism for As(V) involves inner-sphere complex formation via ion exchange.
  • The findings support the use of these composite fibers for practical arsenic removal in water treatment systems.