Sorption studies of uranium and thorium on activated carbon prepared from olive stones: Kinetic and thermodynamic aspects |
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| Authors: | Ceren Kütahyalı Meral Eral |
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| Affiliation: | 1. Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China;2. Institute of Advanced Marine Materials, Harbin Engineering University, 150001, China;1. School of Resource & Environmental Engineering, Wuhan University of Technology, Wuhan 430070, PR China;2. School of Information Engineering, Wuhan University of Technology, Wuhan 430070, PR China;1. Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei 230031, PR China;2. Institute of Resources & Environment, Henan Polytechnic University, Jiaozuo 454000, PR China;3. Faculty of Engineering, King Abdulaziz University, Jeddah 21589, Saudi Arabia;1. State Key Laboratory of Environment-friendly Energy Materials, Sichuan Co-Innovation Center for New Energetic Materials, National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety, Nuclear Waste and Environmental Safety Key Laboratory of Defense, School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang 621010, PR China;2. Division of Target Science and Fabrication, Research Center of Laser Fusion, China Academy of Engineering Physics, P.O. Box 919-987, Mianyang 621900, PR China |
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| Abstract: | Activated carbon prepared by the chemical activation of olive stone was examined for the sorption of uranium and thorium from aqueous solutions. Precursor/activating agent (ZnCl2) ratio (1:2) and 500 °C carbonization temperature were used for the preparation of the sorbent. The total sorption capacities were found to be 0.171 and 0.087 mmol g?1 for uranium and thorium, respectively. The sorption of uranium and thorium was studied as a function of shaking time, pH, initial metal ion concentration, temperature and adsorbent concentration in a batch system. The sorption followed pseudo-second-order kinetics. ΔH° and ΔS° values for thorium and uranium sorption were calculated from the slope and intercept of plots of ln Kd versus 1/T. The positive values of ΔH° indicate the endothermic nature of the process for both metals and decrease in the value of ΔG° with rise in temperature show that the sorption is more favorable at high temperature. |
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