Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Adsorption behavior of platinum-group metals and Co-existing metal ions from simulated high-level liquid waste using HONTA and Crea impregnated adsorbent

  • Naoki Osawa (Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University) ;
  • Seong-Yun Kim (Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University) ;
  • Masahiko Kubota (Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University) ;
  • Hao Wu (Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University) ;
  • Sou Watanabe (Japan Atomic Energy Agency) ;
  • Tatsuya Ito (Japan Atomic Energy Agency) ;
  • Ryuji Nagaishi (Japan Atomic Energy Agency)
  • Received : 2023.06.17
  • Accepted : 2023.09.03
  • Published : 2024.03.25
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Abstract

The volume and toxicity of radioactive waste can be decreased by separating the components of high-level liquid waste according to their properties. An impregnated silica-based adsorbent was prepared in this study by combining N,N,N',N',N",N"-hexa-n-octylnitrilotriacetamide (HONTA) extractant, N',N'-di-n-hexyl-thiodiglycolamide (Crea) extractant, and macroporous silica polymer composite particles (SiO2-P). The performance of platinum-group metals adsorption and separation on prepared (HONTA + Crea)/SiO2-P adsorbent was then assessed together with that of co-existing metal ions by batch-adsorption and chromatographic separation studies. From the batch-adsorption experiment results, (HONTA + Crea)/SiO2-P adsorbent showed high adsorption performance of Pd(II) owing to an affinity between Pd(II) and Crea extractant based on the Hard and Soft Acids and Bases theory. Additionally, significant adsorption performance was observed toward Zr(IV) and Mo(VI). Compared with studies using the Crea extractant, the high adsorption performance of Zr(IV) and Mo(VI) is attributed to the HONTA extractant. As revealed from the chromatographic experiment results, most of Pd(II) was recovered from the feed solution using 0.2 M thiourea in 0.1 M HNO3. Additionally, the possibility of recovery of Zr(IV), Mo(VI), and Re(VII) was observed using the (HONTA + Crea)/SiO2-P adsorbent.

Keywords

Acknowledgement

This work was supported by JSPS KAKENHI Grant Number 22H00307.

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