U(VI) adsorption onto cetyltrimethylammonium bromide modified bentonite in the presence of U(VI)-CO3 complexes

Liu, Jun; Zhao, Changsong; Tu, Hong; Yang, Jijun; Li, Feize; Li, Dongmei; Liao, Jiali; Yang, Yuanyou; Tang, Jun; Liu, Ning

doi:10.1016/j.clay.2016.09.005

Cited by 42 publications

(8 citation statements)

References 69 publications

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“…For example, hexadecyltrimethylammonium-bromide-functionalized bentonite was used for the removal of uranyl carbonates, resulting in an adsorption capacity of ca. 280 mg/g with a proposed mechanism of ion exchange between the bromide counterions and the uranyl carbonate anions …”

Section: Clay Functionalizationmentioning

confidence: 99%

Functionalized Clays for Radionuclide Sequestration: A Review

Wall

Maulden

Gager

et al. 2022

ACS Earth Space Chem.

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Performance assessment of nuclear waste disposal options requires implementation of effective buffer materials. Buffer materials must meet longevity requirements and scavenge challenging radioisotopes, e.g., iodine-129 (I-129) and technetium-99 (Tc-99), both long-lived, highly mobile, anionic species in oxic environments. In many proposed nuclear waste repositories, heat generating radioactive waste will be surrounded by clay buffer material, which swells to fill the gap between the waste package and the host geology, restricting radionuclide transport to diffusive processes for several hundred years. The clay can be functionalized to further the limit release of Tc-99, as pertechnetate (TcO 4 − ), and I-129, as iodate (IO 3 − ) and iodide (I − ). Here, we review clay buffer functionalization and the potential to enhance sequestration of anionic radionuclides that have an increased risk of leaching out of a disposal facility. Functionalization with quaternary amines, nanosilver, bismuth-based materials, silane, and aluminum pillars have been demonstrated to improve the removal of targeted contaminants from solution. This review defines key research questions that remain: (i) can functionalized clay immobilize TcO 4 − , IO 3 − , and I − to the same extent as the reactive components themselves? (ii) Does functionalization affect the ability of the clay barrier to perform its safety functions of protecting the waste canister and limiting radionuclide transport? In addition to radionuclide retention, a multimodal analytical approach is required to assess functionalized clay performance, and recommended techniques are reviewed here. The key parameters that can influence radionuclide sequestration by functionalized clay are also evaluated. Theoretical approaches, including both density functional theory calculations and molecular dynamics simulations, can inform the energetics and kinetics of radionuclide interactions with functionalized clays. This combined experimental and theoretical approach can link atomistic and microscopic processes to predict the macroscopic physical properties of the functionalized clays.

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Section: Clay Functionalizationmentioning

confidence: 99%

Functionalized Clays for Radionuclide Sequestration: A Review

Wall

Maulden

Gager

et al. 2022

ACS Earth Space Chem.

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“…1 g/L uranium stock solution was prepared based on our published research (Liu et al 2017). All the used chemicals were analytical grade.…”

Section: Chemicalsmentioning

confidence: 99%

U(VI) Adsorption onto Low Dose Radiation Acclimated Tradescantia Fluminensis

Liu

Shu

Shi

et al. 2021

Preprint

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The plants that long-term grown in radiation area could be acclimated by low dose radiation (LDR). In this paper, LDR acclimated Tradescantia fluminensis (Commelinaceae) was first collected as a biomass adsorbent towards uranium adsorption. Comparative experiments verified the potential radiation effects of LDR acclimation, moreover, qe values of the wild and LDR acclimated Tradescantia fluminensis were ~16 mg/g and 20 mg/g, respectively. U(VI) adsorption amount gradually reached equilibrium after 180 min shaking, and the adsorption process described well by the pseudo-second-order model. However, ionic strength has no obvious effect on the qe values. SEM and TG-DSC suggested good structural stability of LDR acclimated Tradescantia fluminensis during the U(VI) adsorption process. FTIR and XPS verfied the surface coordination of U(VI) via -OH and -COOH groups on LDR acclimated Tradescantia fluminensis surface, and the increasing amounts of the two groups could account for the improved U(VI) adsorption capacity compared to the wild Tradescantia fluminensis. Our present work can indicate that LDR acclimation could be a novel way to obtain biomass adsorbents for U(VI) removal from aqueous solutions.

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“…The band at 441-440 cm −1 originates from the octahedral-tetrahedral bonds (Si-O-Mg bonds) and the bands at 650-648 cm −1 correspond to vibrations of the Mg-OH bond [26,27]. The bands at 690 cm −1 are assigned to the Si-O bonds deformation and bending modes [28]. Those at 483-475 cm −1 correspond to the Si-O-Si bending vibrations.…”

Section: Fourier-transform Infrared Spectroscopy and Fluorescence Spementioning

confidence: 99%

Adsorption Properties of Sepiolite in Relation to Uranium and Lanthanide Ions

Gładysz–Płaska

2019

Minerals

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The batch technique was used to study the adsorption of La(III), Eu(III), Lu(III), and U(VI) ions on sepiolite and ODTMA–sepiolite under ambient conditions. The effects of pH, time, and initial concentration were investigated. The highest U(VI) adsorption was found on ODTMA-sepiolite in the pH range of 6–8, while in the case of lanthanide ions, adsorption on sepiolite was 80% in the pH range of 4–8 and 98% for pH values above 8. The adsorption capacity of ODTMAsepiolite was found to be 285.6 mg/g for uranium, and raw sepiolite: 142.8 mg/g for U(VI), 91.6 mg/g for La(III), 91.4 mg/g for Eu (III), and 104.9 mol/g for Lu(III). ODTMA–sepiolite turned out to be a weak sorbent for lanthanide ions. Two short- and long-lived fluorescence species were observed in the TRLFS spectra of U(VI) adsorbed on sepiolite at pH 6.5. The average lifetimes of short- (τ1) and long-lived (τ2) fluorescence are τ1 = 2420 ± 430 ns and τ2 = 37950 ± 5710 ns for U-sepiolite; τ1 = 3523 ± 160 ns and τ2 = 45400 ± 1830 ns for U-ODTMA–sepiolite.

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U(VI) adsorption onto cetyltrimethylammonium bromide modified bentonite in the presence of U(VI)-CO3 complexes

Cited by 42 publications

References 69 publications

Functionalized Clays for Radionuclide Sequestration: A Review

Functionalized Clays for Radionuclide Sequestration: A Review

U(VI) Adsorption onto Low Dose Radiation Acclimated Tradescantia Fluminensis

Adsorption Properties of Sepiolite in Relation to Uranium and Lanthanide Ions

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