Abstract
A mechanistic modelling of the adsorption processes onto individual minerals presenting in the near- and far-fields can greatly enhance the credibility of long-term safety assessments of granite-based geological repositories. In this study, the titration and U(VI) adsorption characteristics of chlorite, one of the major minerals of rock fractures, have been studied. Potentiometric titration curves at two ionic strengths (0.1 and 0.4 mol/L NaCl) are successfully interpreted by considering protonation/deprotonation reactions on generic edge sites (≡SOH) in the framework of a non-electrostatic surface complexation model (SCM). The adsorption of U(VI) on chlorite was reached after 24 h, the adsorption kinetics can be described by a pseudo-second-order model. A non-electrostatic SCM with three surface complexes (≡SOUO2+, ≡SO(UO2)3(OH)5 and ≡SO(UO2)3(OH)72−) was set up based on pH edges of U(VI) at adsorption equilibrium in the absence of CO2. Additional, experimental data measured as a function of U(VI) concentration, solid-to-liquid ratio and carbonate concentration were well reproduced by the proposed model. Finally, parallel experiments were conducted using X-ray photoelectron spectroscopy (XPS) to analyze the variation of U(VI) surface species speciation at different pH values. The good agreement between SCM prediction and XPS analysis demonstrates the reliability of the model in predicting and quantifying the radionuclides retention by chlorite.
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 12175094, 22176079
Funding source: Natural Science Foundation of Gansu Province, China
Award Identifier / Grant number: 22JR5RA480
Funding source: Fundamental Research Funds for the Central Universities
Award Identifier / Grant number: lzujbky–2022–sp05, lzujbky–2023–stlt01
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Research ethics: Not applicable.
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Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Competing interests: The authors state no conflict of interest.
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Research funding: This work funded by the National Natural Science Foundation of China (Grant Nos. 12175094, 22176079), the Natural Science Foundation of Gansu Province, China (No. 22JR5RA480) and the Fundamental Research Funds for the Central Universities (lzujbky–2022–sp05, lzujbky–2023–stlt01).
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Data availability: The raw data can be obtained on request from the corresponding author.
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© 2024 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Review
- Understanding the separation of trivalent lanthanides and actinides using multiple diglycolamide-containing ligands: a review
- Original Papers
- The adsorption of U(VI) on chlorite: batch, modeling and XPS study
- Uranium concentrations and its isotopes in baby food of Iraq
- Chromium sorption on synthetic and natural rock minerals with emphasis on speciation behavior and kinetic model using Cr51
- Insight on the properties of multi-walled carbon nanotubes reinforced nitrile rubber composites cured by ionizing radiation or peroxide: a comparative study
- Green synthesis of CdS/flaxseed mucilage nanocomposite films using gamma irradiation for packaging applications
Artikel in diesem Heft
- Frontmatter
- Review
- Understanding the separation of trivalent lanthanides and actinides using multiple diglycolamide-containing ligands: a review
- Original Papers
- The adsorption of U(VI) on chlorite: batch, modeling and XPS study
- Uranium concentrations and its isotopes in baby food of Iraq
- Chromium sorption on synthetic and natural rock minerals with emphasis on speciation behavior and kinetic model using Cr51
- Insight on the properties of multi-walled carbon nanotubes reinforced nitrile rubber composites cured by ionizing radiation or peroxide: a comparative study
- Green synthesis of CdS/flaxseed mucilage nanocomposite films using gamma irradiation for packaging applications