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Sorption of Se(-II) on illite, MX-80 bentonite, shale, and limestone in Na – Ca – Cl solutions
Andrew Walker,Joshua Racette,Takumi Saito,Tammy (Tianxiao) Yang,Shinya Nagasaki 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.5
Selenium has been identified as an element of interest for the safety assessment of a deep geologicalrepository (DGR) for used nuclear fuel. In Canada, groundwaters at DGR depths in sedimentary rockshave been observed to have a high ionic strength. This paper examines the sorption behavior of Se(-II)onto illite, MX-80 bentonite, Queenston shale, and argillaceous limestone in NaeCaeCl solutions ofvarying ionic strength (0.1e6 mol/kgw (m)) and across a pH range of 4e9. Little ionic strength dependence for Se(-II) sorption onto all solids was observed except that sorption at high ionic strength (6 m)was generally slightly lower than sorption at low ionic strength (0.1 m). Illite and MX-80 exhibited theexpected results for anion sorption, while shale and limestone exhibited more constant sorption acrossthe pH range tested. A non-electrostatic surface complexation model successfully predicted sorption ofSe(-II) onto illite and MX-80 using the formation of an inner-sphere surface complex and an outer-spheresurface complex. Optimized values for the formation reactions of these surface species were proposed
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Racette Joshua,Walker Andrew,Nagasaki Shinya,Yang Tianxiao Tammy,Saito Takumi,Vilks Peter 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.10
The adsorption behaviour of Se(-II) onto granite and MX-80 bentonite in CaeNaeCl solutions has been studied utilizing adsorption experiments and surface complexation modelling. Adsorption kinetic experiments allude to steady-state adsorption periods after 7 days for granite and 14 days for MX-80 bentonite. Batch adsorption experiments were carried out to determine the influence that the physicochemical solution properties would have on Se(-II) adsorption behaviour. Adsorption of Se(-II) onto granite and MX-80 bentonite follows the trend of anionic adsorption, with a decrease in Rd values as the solution pH increased. There is also an ionic strength influence on the adsorption of Se(-II) onto granite with a decrease in the Rd value as the ionic strength increased. This effect is not found when observing Se(-II) adsorption onto MX-80 bentonite. Final experiments with a representative groundwater, determined that the adsorption of Se(-II) onto granite and MX-80 bentonite returned Rd values of (1.80 ± 0.10) m3kg1 and (0.47 ± 0.38) m3kg1, respectively. In support of the experiments, a surface complexation modelling approach has been employed to simulate the adsorption of Se(-II) onto granite and MX-80 bentonite, where it was determined that two different surface complexes, ≡S_Se and ≡SOH2 þ_H2Se were capable of simulating Se(-II) adsorption behaviour.
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