Uranium Adsorption on Three Nanohydroxyapatites Under Various Biogeochemical Conditions

Cooper, Precious; Nie, Jing; Larson, Steven L.; Ballard, John H.; Knotek-Smith, Heather M.; Çelik, Ahmet; Dasari, Shaloam; Zhu, Xianchun; Han, Fengxiang X.

doi:10.1007/s11270-021-05298-7

Cited by 7 publications

(1 citation statement)

References 34 publications

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“…When the pH value was 6, the adsorption performance was the best, and the adsorption rate reached 95.68%. It was demonstrated that the deprotonation of functional groups on the HDU-27 surface promoted the electrostatic attraction of the functional groups to uranium as the acidity decreased, which gradually enhanced the ability to adsorb uranium . Therefore, pH = 6 was selected for further adsorption experiments.…”

Section: Uranium Adsorption Experimentsmentioning

confidence: 99%

Exploration of the Performance and Mechanism of Uranium Adsorption by a Covalent Organic Framework Possessing the Thiazole Structure

Bai,

Wang,

et al. 2023

Langmuir

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This study prepared an active 2-D covalent organic skeleton (HDU-27) with a network structure, high crystallinity, considerable specific surface area, excellent pore structure, and excellent stability. Kinetic studies manifested that HDU-27 could effectively capture uranium as monolayer chemisorption within a very short kinetic equilibrium time (10 min). In particular, the temperature significantly and positively impacted the uranium adsorption performance of HDU-27. At 298, 313, and 328 K, the adsorption capacity reached 269.2, 488.8, and 576.2 mg g–1, respectively, suggesting the potential to treat high-temperature industrial wastewater containing uranium. HDU-27 had high stability and recoverability with an adsorption efficiency of 98.5% after five adsorption–desorption cycles. According to X-ray photoelectron spectroscopy, the mechanism of interaction between U(VI) and HDU-27 was mainly the chelation of UO2 2+ by the N atom in the thiazole structure and the strong coordination of the O atom in the keto structure with UO2 2+. More excitingly, HDU-27 could chemically reduce soluble U(VI) to insoluble U(IV) and release binding sites for the adsorption of additional U(VI). In conclusion, HDU-27 has outstanding potential for uranium adsorption from industrial wastewater containing uranium.

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Section: Uranium Adsorption Experimentsmentioning

confidence: 99%