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Sorption of U(IV) on MX-80, illite, shale and limestone in Na-Ca-Cl solutions

Nagasaki Shinya|Zheng Zhiwei|Liu Jianan|Yang Jieci|Yang Tianxiao Tammy
한국원자력학회 (Korean Nuclear Society)|2025.10|Nuclear Engineering and Technology|제57권 제10호|DOI 10.1016/j.net.2025.103720

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LimestoneShaleIlliteSorptionUranium(IV)MX-80
주제분류원자력공학

초록

Uranium has been identified as an element of interest for the safety assessment of a deep geological repository (DGR) for used nuclear fuel. This paper studied the sorption of tetravalent U(IV) onto MX-80 bentonite, illite, shale and limestone in ionic strength 0.1–6 mol/kgw (m) Na-Ca-Cl solutions at pHm = 4–10 (for MX-80, illite, shale) and pHm = 5–10 (for limestone) under reducing conditions. Sorption of U(IV) on MX-80 increased with pHm until pHm = 8 and then reached a sorption plateau. Sorption of U(IV) on illite and shale increased from pHm = 4 to 5 and then reached a sorption plateau. Sorption of U(IV) on limestone increased with pHm up to pHm = 7 and then steeply decreased with pHm. Sorption of U(IV) on all four solids was not influenced by the ionic strength of Na-Ca-Cl solutions. The sorption of U(IV) onto MX-80 and illite in Na-Ca-Cl solutions was successfully simulated by a 2 site protolysis non-electrostatic surface complexation and cation exchange (2SPNE SC/CE) model using three inner-sphere surface complexation reactions. Values of surface complexation constants (log K0) were optimized

Abstract

Uranium has been identified as an element of interest for the safety assessment of a deep geological repository (DGR) for used nuclear fuel. This paper studied the sorption of tetravalent U(IV) onto MX-80 bentonite, illite, shale and limestone in ionic strength 0.1–6 mol/kgw (m) Na-Ca-Cl solutions at pHm = 4–10 (for MX-80, illite, shale) and pHm = 5–10 (for limestone) under reducing conditions. Sorption of U(IV) on MX-80 increased with pHm until pHm = 8 and then reached a sorption plateau. Sorption of U(IV) on illite and shale increased from pHm = 4 to 5 and then reached a sorption plateau. Sorption of U(IV) on limestone increased with pHm up to pHm = 7 and then steeply decreased with pHm. Sorption of U(IV) on all four solids was not influenced by the ionic strength of Na-Ca-Cl solutions. The sorption of U(IV) onto MX-80 and illite in Na-Ca-Cl solutions was successfully simulated by a 2 site protolysis non-electrostatic surface complexation and cation exchange (2SPNE SC/CE) model using three inner-sphere surface complexation reactions. Values of surface complexation constants (log K0) were optimized

관련 논문AI추천

Sorption of U(VI) on MX-80 bentonite, illite, shale and limestone in Na–Ca–Cl saline solutionsLiu Jianan, Nagasaki Shinya, Yang Tammy, Zheng Zhiwei한국원자력학회 · Nuclear Engineering and Technology2024 · 제56권 제11호Sorption of tetravalent U(IV) on MX-80 and granite in Ca-Na-Cl solutions under reducing conditionsLiu Jianan, Nagasaki Shinya, Yang Jieci, Yang Tianxiao (Tammy), Zheng Zhiwei한국원자력학회 · Nuclear Engineering and Technology2025 · 제57권 제12호Sorption of Se(-II) on illite, MX-80 bentonite, shale, and limestone in Na – Ca – Cl solutionsAndrew Walker, Joshua Racette, Shinya Nagasaki, Takumi Saito, Tammy (Tianxiao) Yang한국원자력학회 · Nuclear Engineering and Technology2022 · 제54권 제5호Influence of Ca–Na–Cl physicochemical solution properties on the adsorption of Se(-II) onto granite and MX-80 bentoniteNagasaki Shinya, Racette Joshua, Saito Takumi, Vilks Peter, Walker Andrew, Yang Tianxiao Tammy한국원자력학회 · Nuclear Engineering and Technology2023 · 제55권 제10호Multiscale modeling of smectite illitization in bentonite buffer of engineered barrier system김진섭, Lee Kyung Jae, Xiong Xinwei, You Jiahui한국원자력학회 · Nuclear Engineering and Technology2024 · 제56권 제8호Molybdenum release from high burnup spent nuclear fuel at alkaline and hyperalkaline pHCasas Ignasi, Clarens Frederic, De Pablo Joan, García-Gómez Sonia, Giménez Javier, Iglesias Luis, Kokinda Jakub, Llorca Jordi, Martínez-Torrents Albert, Serrano-Purroy Daniel한국원자력학회 · Nuclear Engineering and Technology2024 · 제56권 제1호

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