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Removal of Antimony(V) from aqueous solutions by electrodeionization
Ecem Köseoğlu1, Yaşar Kemal Recepoğlu2, Özgür Arar1
1Department of Chemistry, Faculty of Science, Ege University, Bornova, Izmir, 35040, Türkiye.
Chemosphere
|January 5, 2025
Summary
This study demonstrates an effective Electrodeionization (EDI) system for removing toxic antimony (Sb(V)) from water. The system achieves over 99% removal efficiency, even with interfering ions present.
Area of Science:
- Environmental Science
- Water Treatment Technologies
- Electrochemistry
Background:
- Antimony (Sb(V)) is a toxic element posing risks to aquatic ecosystems and human health.
- Conventional water treatment methods may struggle with efficient and cost-effective antimony removal.
- Electrodeionization (EDI) offers a promising approach for contaminant removal through combined ion exchange and electrochemical processes.
Purpose of the Study:
- To investigate the efficiency of an Electrodeionization (EDI) system for removing pentavalent antimony (Sb(V)) from aqueous solutions.
- To evaluate the impact of key operational parameters on Sb(V) removal performance.
- To assess the system's robustness in the presence of common interfering ions.
Main Methods:
- A combined ion exchange resin and ion exchange membrane system was configured as an Electrodeionization (EDI) cell.
- Systematic examination of operational parameters: applied potential, flow rate, and electrode compartment Na₂SO₄ concentration.
- Evaluation of Sb(V) removal efficiency under varying conditions and in the presence of interfering ions (Cl⁻, SO₄²⁻, NO₃⁻, PO₄³⁻).
Main Results:
- Maximum Sb(V) removal efficiency reached 99% at applied potentials of 40 V and 50 V, reducing residual concentrations to 60 μg/L and 9 μg/L, respectively.
- Optimal removal efficiency of 99% was achieved at flow rates of 2 L/h and above.
- Maintaining 99% removal efficiency was possible with Na₂SO₄ concentrations ranging from 0.005 M to 0.05 M.
- The system demonstrated high Sb(V) removal efficiency (99%) even with the presence of low concentrations of common interfering ions.
Conclusions:
- The developed Electrodeionization (EDI) system is highly effective for removing toxic antimony (Sb(V)) from water.
- Operational parameters such as applied potential and flow rate significantly influence Sb(V) removal efficiency.
- The EDI system exhibits robustness and potential for practical application in treating antimony-contaminated water sources.
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