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A new and practical Se(IV) removal method using Fe3+ type cation exchange resin
Daisuke Kawamoto1, Yui Yamanishi2, Hironori Ohashi3
1Department of Chemical and Biological Sciences, Faculty of Science, Japan Women's University, 2-8-1 Mejirodai, Bunkyo-ku, Tokyo, 112-8681, Japan; Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.
Journal of Hazardous Materials
|June 16, 2019
Summary
This study presents an effective method for removing selenite ions (Se(IV)) from water using a ferric ion-loaded cation exchange resin. The adsorbent shows high efficiency in removing Se(IV) through specific Fe-O-Se bond formation.
Area of Science:
- Environmental Science
- Water Treatment Technology
- Materials Science
Background:
- Effective selenium removal from water is crucial for environmental protection.
- Conventional methods face challenges in selenium remediation.
- Novel adsorbents are needed for efficient selenium capture.
Purpose of the Study:
- To investigate the adsorption behavior of selenium species on a ferric ion-loaded cation exchange resin.
- To elucidate the adsorption mechanism of selenium on the adsorbent.
- To evaluate the efficiency of the adsorbent for selenium removal in batch and column systems.
Main Methods:
- Batch adsorption experiments to assess selenium uptake.
- Column experiments to evaluate real-time removal efficiency.
- Fe K-edge X-ray absorption spectroscopy and 57Fe Mössbauer spectroscopy for mechanism elucidation.
- Se K-edge EXAFS spectra analysis for bonding characterization.
Main Results:
- The adsorbent effectively adsorbed selenite ions (Se(IV)) but showed minimal adsorption for selenate ions (Se(VI)).
- Spectroscopic analysis revealed the formation of Fe-O-Se bonds, indicating specific adsorption of Se(IV).
- Column studies demonstrated efficient removal of Se(IV) from synthetic water, with a breakthrough capacity of 3 tons.
Conclusions:
- Ferric ion-loaded cation exchange resin is a promising adsorbent for selenite removal from water.
- The adsorption mechanism involves specific binding through Fe-O-Se bonds.
- The developed method offers an efficient solution for environmental selenium remediation.
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