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2021 Vol.26, Issue 5 Preview Page
Effects of Bentonite Illitization on Cesium Sorption

벤토나이트의 일라이트화에 의한 세슘 수착 특성 변화 연구

Jeonghwan Hwang1
,
Sungwook Choung2
,
Weon Shik Han1*
,
Wonwoo Yoon1
황정환 1
,
정성욱 2
,
한원식 1*
,
윤원우 1
1Department of Earth System Sciences, Yonsei University, Seoul 03722, Republic of Korea
2Research Center for Geochronology and Isotope Analysis, Korea Basic Science Institute (KBSI),
1연세대학교 지구시스템과학과
2한국기초과학지원연구원
*Corresponding Author
31 October 2021. pp. 29-38
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Abstract

This study investigated the mineralogical properties of bentonite and illite and evaluated the Cs sorption at various concentrations ( C w ≈1–10 5 μg/L). Bentonite samples, collected from South Korea and USA, majorly consisted of Ca- and Na-montmorillonite, showed large cation exchange capacity (CEC, 91.4 and 47.3 meq/100 g) and specific surface area (SSA, 46.1 and 39.7 m 2 /g). In contrast, illite sample (USA) had relatively low values for 14.4 meq/100g of CEC and 29.3 m 2 /g of SSA, respectively. Bentonite and illite had different non-linear sorption for Cs along with C w . At low C w <10 μg/L, illite showed higher sorption capacity than bentonite despite low CEC because of the existence of specific sorption sites at the weathered mineral edge. However, as C w increased, bentonite represented high sorption capacity because the cation exchange between Cs and interlayer cations was effective at high C w conditions. These results implicated that the Cs concentration is important to evaluate the sorption performance of bentonite and illite. Finally, the Cuadros’ kinetic model for illitization using various K concentrations (2×10-5 and 1.7×10-3 mol/L) and temperature (100–200℃) showed that up to 50% of the montmorillonite in bentonite could be converted to illite, suggesting that the illitization should be considered to evaluate the sorption performance of the bentonite in deep geological disposal repository.

Keywords
Bentonite
Illite
Sorption
Cesium
Deep geological disposal repository
References

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Information
  • Publisher :The Korean Society of Soil and Groundwater Environment
  • Publisher(Ko) :한국지하수토양환경학회
  • Journal Title :Journal of Soil and Groundwater Environment
  • Journal Title(Ko) :지하수토양환경
  • Volume : 26
  • No :5
  • Pages :29-38
  • Received Date : 2021-09-03
  • Revised Date : 2021-09-13
  • Accepted Date : 2021-10-06
  • DOI :https://doi.org/10.7857/JSGE.2021.26.5.029
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