Sorption of U(VI) on magnetic illite: effects of pH, ions, humic substances and temperature

Du, Yongling; Yin, Zhuoxin; Wu, Haixia; Li, Ping; Qi, Wei; Wu, Wangsuo

doi:10.1007/s10967-014-3893-4

Cited by 27 publications

(2 citation statements)

References 48 publications

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“…In addition, the adsorption capacities of U when the adsorption equilibrium was reached after 24 h in the experiments showed a slight difference from those obtained through tting. These results indicate that the U adsorption by sandstones outside a mining area is more consistent with the pseudo-second-order kinetic equation and that its adsorption rate is controlled by chemical adsorption (Du et al 2015). In addition, the tting of data on different cores yielded similar Q e values, suggesting that the cores at different distances from the mining area had similar saturated adsorption capacities of U in groundwater.…”

Section: )supporting

confidence: 60%

Characteristics and influencing factors of uranium adsorption by sandstones outside an acid in situ leaching uranium mining area

Yang,

Cui,

Meng

et al. 2023

Environ Earth Sci

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Uranium (U) contamination in groundwater of the uranium mines exploited using the in-situ leaching (ISL) technology (also referred to as the ISL uranium mines) has attracted wide international attention. Since the adsorption of U in groundwater by aquifer media in uences the migration scope of U, understanding the U adsorption by aquifer media is of great signi cance for accurately predicting the in uencing scope of ISL uranium mines on groundwater. This study collected sandstone samples from the ore-bearing aquifer outside a typical mining area in a uranium mine exploited using the acid ISL (AISL) technology (also referred to as an AISL uranium mine) in northern China. Using these sandstone samples, this study conducted batch adsorption experiments and column experiments of U to reveal the characteristics and major in uencing factors of U adsorption under different conditions. The results show that the adsorption of U by sandstones in the ore-bearing aquifer outside a mining area satis es the pseudo-second-order kinetic equation and the linear isothermal adsorption model. In the batch U adsorption experiments, the adsorption e ciency and capacity for U reached maxima of 77.45% and 0.069 mg/g at pH 7, respectively. As shown by column experiments, the sandstones showed a signi cant increase in the U adsorption and retardation as pH increased. The SO 4 2− concentration has minor effects on U adsorption under experimental conditions. Sandstones from different monitoring wells exhibited different U adsorption characteristics. Sandstone cores with relatively high contents of clay minerals such as illite showed strong U adsorption. Under the same experimental conditions, the U distribution coe cient K d (6.91×10 − 2 L/g) obtained from column experiments is much less than that (0.14 L/g) obtained from the batch U adsorption experiments. These results suggest that it is necessary to take into account the U adsorption and retardation by aquifer media in predicting the impacts of ISL uranium mines on the groundwater environment.

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Section: )supporting

confidence: 60%

Characteristics and influencing factors of uranium adsorption by sandstones outside an acid in situ leaching uranium mining area

Yang,

Cui,

Meng

et al. 2023

Environ Earth Sci

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“…Sorption is more widely used for heavy metal pollution remediation than membrane separation, precipitation, ion exchange and extraction (Michard et al 1996;Ganesh et al 1999;Vaaramaa et al 2000;Kulkarni 2003;Singh et al 2010). At present, research on the sorption of uranium onto silicate minerals is chiefly concentrated on clay minerals such as kaolinite, illite, montmorillonite and bentonite (Chisholm-Brause et al 2001;Ren et al 2010;Du et al 2015;Reinoso-Maset and Ly 2016). However, the sorption characteristics of uranium onto mullite have not been commonly studied.…”

Section: Introductionmentioning

confidence: 99%

Uranium sorption onto mullite: Characteristics of isotherms, kinetics and thermodynamics

Long

Shi

et al. 2019

J Earth Syst Sci

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The sorption of uranium onto mullite influenced by pH, initial adsorbate concentration, sorption dose and reaction duration was probed utilising batch techniques. X-ray powder diffraction was used to characterise mullite. Sorption isotherms, sorption kinetics and thermodynamic characteristics were also investigated. The Freundlich isotherm model could best depict experimental data, suggesting that the sorption mechanism of uranium onto mullite may be multi-layer adsorption. The E value obtained from the Dubinin-Radushkevich model implied that uranium sorption onto mullite is a chemical process. The pseudo-second-order model successfully depicted uranium sorption onto mullite, indicating that the sorption rate is mainly controlled by chemical sorption. The thermodynamic parameters computed showed that entropy and enthalpy under the trial conditions were positive and that values of DG H were negative. Thermodynamics illustrated that the sorption process was endothermic and spontaneous. The results achieved in this study are intended to further a deeper comprehension of uranium migration in silicate minerals.

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Application of sequential extraction for analyzing source and sink of uranium in Huanghe River sediments, China

Zhong

Jiang

et al. 2023

J. Ocean. Limnol.

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Sorption of U(VI) on magnetic illite: effects of pH, ions, humic substances and temperature

Cited by 27 publications

References 48 publications

Characteristics and influencing factors of uranium adsorption by sandstones outside an acid in situ leaching uranium mining area

Characteristics and influencing factors of uranium adsorption by sandstones outside an acid in situ leaching uranium mining area

Uranium sorption onto mullite: Characteristics of isotherms, kinetics and thermodynamics

Application of sequential extraction for analyzing source and sink of uranium in Huanghe River sediments, China

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