Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 466, Issue -, Pages 85-91Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2014.11.020
Keywords
Uranium (VI); Magnetic oxine; Adsorption; Kinetics; Thermodynamics
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Funding
- National Natural Science Foundation of China [21353003]
- Special Innovation Talents of Harbin Science and Technology [2013RFQXJ145]
- Fundamental Research Funds of the Central University (HEUCFZ)
- Natural Science Foundation of Heilongjiang Province [B201316]
- Program of International S&T Cooperation special project [2013DFR500060]
- Transformation of Scientific and Technological Achievements of Harbin [2013DB4BG011]
- Research and Development of Industrial Technology Project of Jilin Province [JF2012C022-4]
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We present a study of uranium (VI) adsorption in aqueous solutions by magnetic oxine (ferroferric oxide/oxine composite). Batch experiments of uranium (VI) adsorption were conducted, investigating the significance of solution pH, contact time, ionic strength, and temperature on uranium sorption efficiency. The results suggest that maximum adsorption capacity is 125 mg g(-1) when the initial uranium (VI) concentration is 50 mg L-1 at 298 K, displaying a mass transport property of the magnetic oxine for the removal of uranium (VI). The sorption was strongly dependent on pH and independent of ionic strength, indicating that the sorption was mainly dominated by inner-sphere surface complexation. The experimental data are analyzed using sorption kinetic models, revealing that the process follows a pseudo-second-order kinetic model. The thermodynamic parameters show that the process is endothermic and spontaneous. We demonstrate a fast, efficient and convenient material for the removal of uranium (VI) from aqueous solutions. (C) 2014 Elsevier B.V. All rights reserved.
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