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Open AccessArticle

The Removal of Uranium and Thorium from Their Aqueous Solutions by 8-Hydroxyquinoline Immobilized Bentonite

Chemistry Department, Faculty of Science, Helwan University, Ain Helwan, Helwan 11795, Egypt
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Minerals 2019, 9(10), 626; https://doi.org/10.3390/min9100626
Received: 10 September 2019 / Revised: 27 September 2019 / Accepted: 6 October 2019 / Published: 11 October 2019
(This article belongs to the Section Environmental Mineralogy and Biogeochemistry)
The sorption of uranium and thorium from their aqueous solutions by using 8-hydroxyquinoline modified Na-bentonite (HQ-bentonite) was investigated by the batch technique. Na-bentonite and HQ-bentonite were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier Transform Infrared (FTIR) spectroscopy. Factors that influence the sorption of uranium and thorium onto HQ-bentonite such as solution pH, contact time, initial metal ions concentration, HQ-bentonite mass, and temperature were tested. Sorption experiments were expressed by Freundlich and Langmuir isotherms and the sorption results demonstrated that the sorption of uranium and thorium onto HQ-bentonite correlated better with the Langmuir isotherm than the Freundlich isotherm. Kinetics studies showed that the sorption followed the pseudo-second-order kinetic model. Thermodynamic parameters such as ΔH°, ΔS°, and ΔG° indicated that the sorption of uranium and thorium onto HQ-bentonite was endothermic, feasible, spontaneous, and physical in nature. The maximum adsorption capacities of HQ-bentonite were calculated from the Langmuir isotherm at 303 K and were found to be 63.90 and 65.44 for U(VI) and Th(IV) metal ions, respectively. View Full-Text
Keywords: sorption; uranium; thorium; bentonite; adsorption kinetics; Langmuir isotherm sorption; uranium; thorium; bentonite; adsorption kinetics; Langmuir isotherm
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MDPI and ACS Style

A. Salah, B.; S. Gaber, M.; T. Kandil, A. The Removal of Uranium and Thorium from Their Aqueous Solutions by 8-Hydroxyquinoline Immobilized Bentonite. Minerals 2019, 9, 626.

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