방사성폐기물학회지 (Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT))

  • 제22권3호
  • /
  • Pages.313-324
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  • 2024
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  • 1738-1894(pISSN)
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  • 2288-5471(eISSN)
한국방사성폐기물학회 (Korean Radioactive Waste Society)
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Thermodynamics of Se(IV) Sorption Onto Ca-type Bentonil-WRK Montmorillonite

  • 투고 : 2024.06.04
  • 심사 : 2024.08.12
  • 발행 : 2024.09.30
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초록

Se sorption onto Ca-type montmorillonite purified from Bentonil-WRK-a new research bentonite introduced by Korea Atomic Energy Research Institute-was examined under ambient conditions (pH 4-9, pe 7-9, I = 0.01 M CaCl2, and T = 25℃). Se(IV) was identified as the oxidation state responsible for weak sorption (Kd < 22 L·kg-1) by forming surface complexes with edge functional groups of the montmorillonite. Thermodynamic modeling, considering reaction mechanisms of outer-sphere complexation (≡AlOH+2 + HSeO3- ⇌ ≡AlOH3SeO3, log K = 0.50 ± 0.21), inner-sphere complexation (2≡AlOH + H2SeO3(aq) ⇌ (≡Al)2SeO3 + 2H2O(l), log K = 7.89 ± 0.51), and Ca2+-involved ternary complexation (≡AlOH + Ca2+ + SeO32- ⇌ ≡AlOHCaSeO3, log K = 7.69 ± 0.28) between selenite and aluminol sites of montmorillonite, acceptably reproduced the batch sorption data. Outer- and inner-sphere complexes are predominant Se(IV) forms sorbed in acidic (pH ≈ 4) and near-acidic (pH ≈ 6) regions, respectively, whereas ternary complexation accounts for Se(IV) sorption at neutral pHs under the ambient conditions. The experimental and modeling data generally extend a material-specific sorption database of Bentonil-WRK, which is essential for assessing its radionuclide retention performance as a buffer candidate of deep geological disposal system for high-level radioactive waste.

키워드

과제정보

This study was supported by the Institute for Korea Spent Nuclear Fuel (iKSNF) and National Research Foundation of Korea (NRF) grant funded by the Korean Ministry of Science and ICT (Grant code: 2021M2E1A1085202).

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