Study on the diffusion behavior of rhenium in CTAB-modified bentonite
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Jiacheng Guo
und
Xuebin Su
Abstract
The use of cationic surfactant CTAB (cetyltrimethylammonium bromide) to modify bentonite has the advantages of convenience, speed, and large loading capacity. Due to the chemical similarity between rhenium and technetium, many hydrogeological studies on technetium use rhenium as a substitute for cold testing. Therefore, in this study, CTAB was used as a modifier for organic modification of bentonite by cation exchange method to change its properties and better adsorb Re(VII). The feasibility of using CTAB-modified bentonite as an additive in backfill materials was discussed through a series of experiments. The research results indicate that the addition of modified bentonite significantly inhibits the diffusion of Re(VII) in bentonite, manifested as a decrease in total diffusion amount, diffusion flux, apparent diffusion coefficient, and effective diffusion coefficient, while increasing the rock capacity factor. When the mass ratio of modified bentonite in the diffusion medium increases from 0 % to 20 %, the effective diffusion coefficient of Re decreases from 19.56 × 10−11 cm2/s to 0.046 × 10−11 cm2/s, the rock capacity factor of the diffusion medium increases from 0.995 to 29.43. In addition, the increase in pH value and ionic strength affects the surface sites of bentonite, thereby increasing the surface diffusion coefficient and effective diffusion coefficient of rhenium, while the rock bearing capacity decreases. These findings suggest that the adsorption capacity of TcO4− can be enhanced by doping modified bentonite in backfill materials, reducing the migration of TcO4− within the backfill material, potentially providing benefits for the safe storage of high-level radioactive waste.
Funding source: Natural Science Research Project of Guizhou Province
Award Identifier / Grant number: (20232ACB203014)
Funding source: Joint Innovation Fund of China National Uranium Corporation Limited and National Key Laboratory of Nuclear Resources and Environment at East China University of Science and Technology
Award Identifier / Grant number: (2022NRE-LH-15)
Funding source: Project of Nuclear Technology R&D Program (Proto-Nuclear Energy Development)
Award Identifier / Grant number: (HNKF202311(48)
Funding source: East China University of Science and Technology
Award Identifier / Grant number: Unassigned
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Research ethics: The local Institutional Review Board deemed the study exempt from review. OR.
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Informed consent: Informed consent was obtained from all individuals included in this study, or their legal guardians or wards.
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Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Use of Large Language Models, AI and Machine Learning Tools: None declared.
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Conflict of interest: All other authors state no conflict of interest.
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Research funding: This project is mainly supported by the following funds. Joint Innovation Fund of China National Uranium Corporation Limited and National Key Laboratory of Nuclear Resources and Environment at East China University of Science and Technology (2022NRE-LH-15). Key Project of Jiangxi Provincial Natural Science Foundation (20232ACB203014). Project of Nuclear Technology R&D Program (Proto-Nuclear Energy Development) (HNKF202311(48)).
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Data availability: The data in this article can be made public without any restrictions.
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Artikel in diesem Heft
- Frontmatter
- Study on the diffusion behavior of rhenium in CTAB-modified bentonite
- Optimization and range expansion of IRIS reactor accident diagnosis model based on LSTM neural network
- Thermal integrity assessment of the limiter for Pakistan Spherical Tokamak (PST)
- The effect of ambient temperature variation on the spectrometric performance of NaI (Tl) scintillation detector; an experimental study
- Calendar of events
Artikel in diesem Heft
- Frontmatter
- Study on the diffusion behavior of rhenium in CTAB-modified bentonite
- Optimization and range expansion of IRIS reactor accident diagnosis model based on LSTM neural network
- Thermal integrity assessment of the limiter for Pakistan Spherical Tokamak (PST)
- The effect of ambient temperature variation on the spectrometric performance of NaI (Tl) scintillation detector; an experimental study
- Calendar of events
