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Sorption of tetravalent U(IV) on MX-80 and granite in Ca-Na-Cl solutions under reducing conditions

Nagasaki Shinya|Zheng Zhiwei|Liu Jianan|Yang Jieci|Yang Tianxiao (Tammy)
한국원자력학회 (Korean Nuclear Society)|2025.12|Nuclear Engineering and Technology|제57권 제12호|DOI 10.1016/j.net.2025.103699

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키워드

GraniteSorptionMX-80U(IV)pH and ionic strength dependenceSorption distribution coefficient2SPNE SC/CE model
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 behavior of tetravalent U(IV) onto MX-80 bentonite and granite in ionic strength 0.05–1 mol/kgw Ca-Na-Cl solutions at pHm of 4–10 (for MX-80 bentonite) and 4–9 (for granite) under reducing conditions. It was found that sorption of U(IV) on MX-80 gradually increased with pHm from 4 to 7 and then reached a sorption plateau. Sorption of U(IV) on granite increased with pHm dramatically from pHm 4 to 5 and then reached a sorption plateau. Sorption of U(IV) on both MX-80 and granite was not influenced by ionic strength of Ca-Na-Cl solutions. The sorption of U(IV) onto MX-80 and granite in CaNa-Cl solutions was successfully simulated by a 2 site protolysis non electrostatic surface complexation and cation exchange (2SPNE SC/CE) sorption model using four inner-sphere surface complexation reactions. Values of surface complexation reaction constant (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 behavior of tetravalent U(IV) onto MX-80 bentonite and granite in ionic strength 0.05–1 mol/kgw Ca-Na-Cl solutions at pHm of 4–10 (for MX-80 bentonite) and 4–9 (for granite) under reducing conditions. It was found that sorption of U(IV) on MX-80 gradually increased with pHm from 4 to 7 and then reached a sorption plateau. Sorption of U(IV) on granite increased with pHm dramatically from pHm 4 to 5 and then reached a sorption plateau. Sorption of U(IV) on both MX-80 and granite was not influenced by ionic strength of Ca-Na-Cl solutions. The sorption of U(IV) onto MX-80 and granite in CaNa-Cl solutions was successfully simulated by a 2 site protolysis non electrostatic surface complexation and cation exchange (2SPNE SC/CE) sorption model using four inner-sphere surface complexation reactions. Values of surface complexation reaction constant (log K0 ) were optimized.

관련 논문AI추천

Sorption of U(IV) on MX-80, illite, shale and limestone in Na-Ca-Cl solutionsLiu Jianan, Nagasaki Shinya, Yang Jieci, Yang Tianxiao Tammy, Zheng Zhiwei한국원자력학회 · Nuclear Engineering and Technology2025 · 제57권 제10호Sorption 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 제11호Influence 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 제10호Sorption 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 제5호Molybdenum 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 제1호Cesium retention in powdered granite under saline and alkaline conditions: Role of biotite in deep geological repositories구자영, 권장순, 김진석, 이상호, 조호영한국원자력학회 · Nuclear Engineering and Technology2025 · 제57권 제6호

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