Limestone: A Natural, Low-Priced Adsorbent for U(VI)

Limestone obtained from Kirari, Akaltara, Chhattisgarh was applied to adsorb uranium(VI) from an aqueous solution of uranyl nitrate. Batch tests were performed with varying pH (2–9), U(VI) concentration (10–100 mg/L), stirring time (10–80 min), and limestone dosage (0.1–0.6 g/50 mL). At ambient temp...

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Bibliographic Details
Published in:Radiochemistry (New York, N.Y.) N.Y.), 2023-06, Vol.65 (3), p.354-362
Main Authors: Diwan, V., Sar, S. K.
Format: Article
Language:English
Subjects:
Adsorption
Ambient temperature
Aqueous solutions
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Dosage
Kinetics
Limestone
Nuclear Chemistry
Stirring
Uranium
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Summary:Limestone obtained from Kirari, Akaltara, Chhattisgarh was applied to adsorb uranium(VI) from an aqueous solution of uranyl nitrate. Batch tests were performed with varying pH (2–9), U(VI) concentration (10–100 mg/L), stirring time (10–80 min), and limestone dosage (0.1–0.6 g/50 mL). At ambient temperature, 60.5% removal efficiency was recorded at pH 6, U(VI) concentration of 25 mg/L, stirring time of 40 min, and limestone dosage of 0.4 g/50 mL. The adsorption kinetics, thermodynamics, and isotherm were studied. The U(VI) adsorption onto limestone was endothermic and obeyed the Langmuir model with pseudo-first-order kinetics. The U(VI) adsorption onto limestone is due to electrostatic affinity.
ISSN:1066-3622
1608-3288
DOI:10.1134/S1066362223030128