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• W3120264695 endingPage "125140" @default.
• W3120264695 startingPage "125140" @default.
• W3120264695 abstract "The effect of calcium in the uranium-contaminated groundwater on U(VI)aq bioreduction remains uncertain. Some studies indicated that the presence of calcium may inhibit the bioreduction. However, our calculations show the negative standard molar Gibbs free energy of reduction. The bioreduction of the ternary uranyl-carbonate-calcium complexes seems thermodynamically favorable at specific pH. Sorption and reduction experiments were conducted to gain new insights of calcium into the bioreduction. The results show that the complexes were greatly reduced by Shewanella putrefaciens in the slightly acidic pH ~6.0 and alkaline pH ~7.9 solutions with the relatively high CaCl2 (1.0–6.0 mmol/L) although the reduction was difficult at the nearly neutral pH ~6.9. At pH ~6.9, the removal percentage of U(VI)aq decreased from 97.0% to 24.4% with increasing CaCl2 from 0 to 6.0 mmol/L, in contrast to the increasing percentage from 50.9% to 89.7% at pH ~7.9. The obvious removal of U(VI)aq was ascribed to the bioreduction instead of the biosorption, as evidenced by XPS, HRTEM and UV–vis spectra. The calculations such as Eho(CaUO2(CO3)32−/UO2)=−0.5801V and Eho(Ca2UO2(CO3)3(aq)/UO2)=−0.6797V partially accounted for the reduction mechanisms. Accordingly, the U(VI)aq bioreduction is a promising method to remediate the groundwater even rich in calcium and carbonate." @default.
• W3120264695 created "2021-01-18" @default.
• W3120264695 creator A5010200298 @default.
• W3120264695 creator A5014664356 @default.
• W3120264695 creator A5045705100 @default.
• W3120264695 date "2021-06-01" @default.
• W3120264695 modified "2023-10-18" @default.
• W3120264695 title "New insights into the role of calcium in the bioreduction of uranium(VI) under varying pH conditions" @default.
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• W3120264695 doi "https://doi.org/10.1016/j.jhazmat.2021.125140" @default.
• W3120264695 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33858102" @default.
• W3120264695 hasPublicationYear "2021" @default.
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