U (VI) sorption on Ca-bentonite at (hyper) alkaline conditions–Spectroscopic investigations of retention mechanisms

T Philipp, SSA Azzam, A Rossberg, N Huittinen… - Science of the total …, 2019 - Elsevier
Environmental conditions in deep geological repositories for radioactive waste may involve
high pH values due to the degradation of concrete. However, the U (VI) sorption at such …

Hydrotalcite colloidal stability and interactions with uranium (VI) at neutral to alkaline pH

C Foster, S Shaw, TS Neill, N Bryan, N Sherriff… - Langmuir, 2022 - ACS Publications
In the United Kingdom, decommissioning of legacy spent fuel storage facilities involves the
retrieval of radioactive sludges that have formed as a result of corrosion of Magnox nuclear …

[HTML][HTML] Uranium surface processes with sandstone and volcanic rocks in acidic and alkaline solutions

JPL Kenney, J Lezama-Pacheco, S Fendorf… - Journal of Colloid and …, 2023 - Elsevier
Understanding the behaviour of uranium waste, for disposal purposes, is crucial due to the
correlation between pH values and the disposal of distinct types of waste, with low level …

Identification and Quantification of Multiphase U (VI) Speciation on Gibbsite with pH Using TRLFS and PARAFAC of Excitation Emission Matrices

L Lopez-Odriozola, S Shaw… - Environmental …, 2024 - ACS Publications
The significant abundance of uranium in radioactive waste inventories worldwide
necessitates a thorough understanding of its behavior. In this work, the speciation of uranyl …

Impact of physical heterogeneity and transport conditions on effective reaction rates in dissolution

R Oliveira, MJ Blunt, B Bijeljic - Transport in Porous Media, 2023 - Springer
A continuous-time random walk (CTRW) reactive transport model is used to study the impact
of physical heterogeneity on the effective reaction rates in porous media in a sample of …

Computational tools for calculating log β values of geochemically relevant uranium organometallic complexes

ME Kirby, A Simperler, S Krevor, DJ Weiss… - The Journal of …, 2018 - ACS Publications
Uranium (UVI) interacts with organic ligands, subsequently controlling its aqueous
chemistry. It is therefore imperative to assess the binding ability of natural organic …

Experimental study of pH effect on uranium (UVI) particle formation and transport through quartz sand in alkaline 0.1 M sodium chloride solutions

ME Kirby, JS Watson, J Najorka, JPL Kenney… - Colloids and Surfaces A …, 2020 - Elsevier
A thorough understanding of the aqueous uranium VI (U VI) chemistry in alkaline, sodium
containing solutions is imperative to address a wide range of critical challenges in …

A continuous time random walk method to predict dissolution in porous media based on validation of experimental NMR data

R Oliveira, B Bijeljic, MJ Blunt, A Colbourne… - Advances in Water …, 2021 - Elsevier
We develop a reactive transport model for dissolution of porous materials using a
Continuous Time Random Walk (CTRW) formulation with first-order kinetics. Our model is …

The effect of bacterial growth phase and culture concentration on U (VI) removal from aqueous solution

JPL Kenney, T Ellis, FS Nicol, AE Porter, DJ Weiss - Chemical Geology, 2018 - Elsevier
Bacteria play a key role in controlling the mobility of contaminants, such as uranium (U), in
the environment. Uranium could be sourced from disposed radioactive waste, derived either …

Removal of uranium (VI) and thorium (IV) from aqueous solution by Hedera helix leaves: kinetics and thermodynamic studies

FMA Orabi, FI Khalili, LS Ismail - Desalination and Water Treatment, 2021 - Elsevier
In this research, Hedera helix leaves were evaluated for biosorption of uranium (VI) and
thorium (IV) ions from aqueous solution. H. helix leaves were characterized by Fourier …