Uranium (VI) transport in saturated heterogeneous media: Influence of kaolinite and humic acid

Chen, Chong; Zhao, Kang; Shang, Jianying; Liu, Chongxuan; Wang, Jin; Yan, Zhifeng; Liu, Kesi; Wu, Wenliang

doi:10.1016/j.envpol.2018.04.095

Cited by 54 publications

(9 citation statements)

References 43 publications

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“…Furthermore, mobile colloids act as a third phase, apart from the immobile solid constituents and the mobile aqueous phase, largely controlling the transport of pollutants in many environmental compartments (McCarthy and Zachara 1989;de Jonge et al 2004;Baumann et al 2006;Lead and Wilkinson 2006). Specifically, the mobility of colloidal U is favored by Fe, Al, minerals (e.g., clay), carbonbased particles (organic and inorganic) and macromolecules, pH-dependent sorption/desorption interactions, and the formation of alkali-and alkaline-earth uranates (Claveranne-Lamolère et al 2009;Claveranne-Lamolère et al 2011;Dreissig et al 2011;Bots et al 2014;Wang et al 2014;Chen et al 2018;Ge et al 2018;Harguindeguy et al 2018;Maria et al 2020). For example, Yang et al (2013) observed that the desorption of U from colloidal suspensions is influenced by interactions between metal/silicon oxides and humic acids, depending on their composition.…”

Section: +mentioning

confidence: 99%

Distribution, behavior, and erosion of uranium in vineyard soils

Campos

Blanché

Jungkunst

et al. 2021

Environ Sci Pollut Res

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Phosphate fertilization contributes to an input of uranium (U) in agricultural soils. Although its accumulation and fate in agricultural soils have been previously studied, its colloidal transport and accumulation along slopes through erosion have been studied to a lesser extent in viticulture soils. To bridge this gap, the contents and potential mobility of U were investigated in vineyard model soils in the Rhineland-Palatinate region, Germany. In addition to elevated U contents, U was expected to associate with colloids and subject to erosion, thus accumulating on slope foots and in soils with fine structure, and reflecting a greater variability. Moreover, another expectation was the favorable erosion/mobility of U in areas with greater carbonate content. This was tested in three regional locations, at different slope positions and through soil horizon depths, with a total of 57 soil samples. The results show that U concentrations (0.48–1.26 ppm) were slightly higher than proximal non-agricultural soils (0.50 ppm), quite homogenous along slope positions, and slightly higher in topsoils. Assuming a homogeneous fertilization, the vertical translocation of U in soil was most probably higher than along the slope by erosion. In addition, carbonate content and soil texture correlated with U concentrations, whereas other parameters such as organic carbon and iron contents did not. The central role of carbonate and soil texture for the prediction of U content was confirmed using decision trees and elastic net, although their limited prediction power suggests that a larger sample size with a larger range of U content is required to improve the accuracy. Overall, we did not observe neither U nor colloids accumulating on slope foots, thus suggesting that soils are aggregate-stable. Lastly, we suggested considering further soil parameters (e.g., Ca2+, phosphorus, alkali metals) in future works to improve our modelling approach. Overall, our results suggest U is fortunately immobile in the studied locations.

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Section: +mentioning

confidence: 99%

Distribution, behavior, and erosion of uranium in vineyard soils

Campos

Blanché

Jungkunst

et al. 2021

Environ Sci Pollut Res

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“…Montmorillonite-K 10 (Mt, purchased from Sinopharm Chemical Reagent Co., Ltd.) was added into DI water with a solid/liquid ratio of 1/50 (g/mL); the mixture was continuously shaken at the room temperature (23 ± 1 °C) for 3 h and sonicated for 30 min to minimize impurities. After the settle for 2 h, the upper suspension was collected and dried at 60 °C with a fine fraction. , The synthetic method of ferrihydrite (Fh), referring to the description in the book The Iron Oxides , is fully introduced in Section S2 (Supporting Information, SI) . The 2 mM Cr(VI) stock solution containing 10 mM KCl background was prepared from K 2 Cr 2 O 7 and KCl.…”

Section: Methodsmentioning

confidence: 99%

“…After the settle for 2 h, the upper suspension was collected and dried at 60 °C with a fine fraction. 52,53 The synthetic method of Batch Experiments. Samples (0.25 g) consisting of different ratios of Qu, Mt, and Fh were transferred into 30 mL brown polypropylene bottles, and all bottles were shielded with aluminum foil to exclude photochemical reactions.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Identification of the Chromate Sorption Mechanism Conversions in a Quartz–Montmorillonite–Ferrihydrite System

Yang

Ning

et al. 2022

ACS Earth Space Chem.

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The fate of Cr(VI) in soils/sediments largely depends on its sorption by iron oxides/hydroxides. But, their combination with surrounding minerals (e.g., quartz (Qu), clays) evidently changes some properties. Since ferrihydrite (Fh) is the precursor for most iron oxides, the 10 days sorption experiments studying Cr(VI) mobility were performed using the reference Qu–montmorillonite (Mt)–Fh system. From the results of batch experiment, ζ potential, Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy equipped with energy dispersive X-ray spectroscopy, chromium(VI) sorption mechanisms are sensitive in Qu–Mt–Fh mixtures and closely relate to pHs. At acidic conditions, the deposition of Fh on Qu/Mt surfaces decreases the sorption sites for Cr(VI) while the formation of outer-sphere complexation driven by electrostatic attraction increases Cr(VI) mobility in contrast to inner-sphere complexation. At alkaline conditions, the situations are different in Qu–Fh and Mt–Fh systems, even though both increase sorption compared to that with only Fh. Sorption is subject to free Fh in Qu–Fh mixtures, while considering the high loading of the Mt–Fh surface due to the strong association of Si–OH with Fe–O(H), CrO4 2– captures are favorable by hydrogen bonding with water as outer-sphere complexation in Mt–Fh mixtures, resulting in high mobility especially at Mt/Fh ratios of 2/3.

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“…Therefore, natural water contains a certain amount of alkaline earth metal ions such as Ca 2+ and Mg 2+ . The pH of water in nature is close to neutral, which is conducive to the dissolution of carbon dioxide gas in the air, further increasing the concentration of carbonate ions in water [12,13] . It has been reported that the main forms of uranium are Ca 2 UO 2 (CO 3 ) 3 (aq), CaUO 2 (CO 3 ) 2and MgUO 2 (CO 3 ) 3 2in the natural waters [14].…”

Section: −mentioning

confidence: 99%

Adsorption of U(VI) onto Amidoxime-functionalized Hydrothermal Carbon in the Presence of Ca-U(VI)-CO3 Complexes

Dong¹,

Zhang²,

Zhou³

et al. 2020

Res. Appl. Mater. Sci.

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The aim is collecting uranium from groundwater in which uranium mainly exists in negative species, the amidoxime-functionalized hydrothermal carbon (AO-HTC) was synthesized. From the results of N2 adsorption-desorption and SEM, AO-HTC is a small spherical surface; FT-IR and Elemental analysis showed that the amidoxime group was successfully grafted onto the surface of the material; Zeta-potential measurement showed that the amino nitrogen atom is protonated in the oxime group. The optimum pH value of AO-HTC for uranium adsorption is 6.0, and the adsorption equilibrium is reached within 80 min, which is in accordance with the pseudo-second order adsorption kinetic model. The adsorption of uranium by AO-HTC accords with the Langmuir isotherm adsorption model, and the single-layer saturated adsorption capacity is 254.13mg·g-1. The thermodynamic parameters calculated by the adsorption isotherm indicate that AO-HTC adsorption of uranium is a spontaneous endothermic chemical process and Carbonate ion, calcium ion and humic acid concentration have great influence on uranium adsorption. The experiments results show that AO-HTC has the potential to elimination of U(VI) from groundwater.

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Uranium (VI) transport in saturated heterogeneous media: Influence of kaolinite and humic acid

Cited by 54 publications

References 43 publications

Distribution, behavior, and erosion of uranium in vineyard soils

Distribution, behavior, and erosion of uranium in vineyard soils

Identification of the Chromate Sorption Mechanism Conversions in a Quartz–Montmorillonite–Ferrihydrite System

Adsorption of U(VI) onto Amidoxime-functionalized Hydrothermal Carbon in the Presence of Ca-U(VI)-CO3 Complexes

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