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• W1987476072 abstract "Sorption of uranyl ion, UO 2 2+ , on SiO 2 · x H 2 O (silica gel) has been investigated as a function of time, amount of silica gel (0.10–0.60g), uranium concentration (5.00×10 −5 –1.00× −3 M), ionic strength (0.20–1.40M NaClO 4 ), pH (∼2.0–6.0), and temperature (283–333K). Based on kinetic data, the diffusion coefficient of UO 2 2+ ion was calculated to be 6.83(±0.22)×10 −12 m 2 s −1 under particle diffusion-controlled conditions. The rate of sorption of uranyl ion on silica gel was determined to be 8.56(±0.50)×10 −2 min −1 at 298K, pH 1.82±0.05 and 0.20M NaClO 4 . The uranyl sorption data on silica gel followed the Freundlich, Langmuir and Dubinin–Radushkevich (D–R) isotherms. Uranyl sorption (11.48±0.03 (0.20M NaClO 4 ) to 34.81±0.20 (1.40M NaClO 4 ) at pH 2.79±0.03 using 0.10g silica gel. The sorption decreased in the presence of 1.00×10 −3 M fluoride and oxalate ions; while the presence of carbonate anion showed negligible change in uranyl sorption profile in the pH range of 2 to 6 at 0.20M NaClO 4 . Temperature variation experiments showed that the sorption of uranium on silica gel had an endothermic enthalpy, which became more spontaneous at elevated temperatures." @default.
• W1987476072 created "2016-06-24" @default.
• W1987476072 creator A5035553563 @default.
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• W1987476072 date "2007-09-01" @default.
• W1987476072 modified "2023-09-23" @default.
• W1987476072 title "Kinetics and thermodynamics of uranium(VI) sorption on hydrous silica" @default.
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• W1987476072 doi "https://doi.org/10.1524/ract.2007.95.9.507" @default.
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