Sorption properties of oxides VIII: sorption of uranium on hydrous oxides |
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| Affiliation: | 1. School of Mathematics and Statistics, Xi׳an Jiaotong University, Xi׳an, Shaanxi 710049, China;2. School of Mathematics and Statistics, Xidian University, Xi׳an, Shaanxi 710075, China;1. Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang, Sichuan, China;2. Sichuan University of Science & Engineering, Zigong, Sichuan, China;3. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, Sichuan, China;1. State Key Laboratory of High Performance Computing, National University of Defense Technology, Changsha, Hunan 410073, China;2. School of Computer, National University of Defense Technology, Changsha, Hunan 410073, China;3. State Key Laboratory of Mathematical Engineering and Advanced Computing, PLA Information Engineering University, Zhengzhou, Henan 450002, China;1. Comisión Nacional de Energía Atómica (CNEA), CONICET, Gerencia Química, Centro Atómico Constituyentes, Av. Gral. Paz 1499, San Martín, B1650KNA Buenos Aires, Argentina;2. Comisión Nacional Energía Atómica (CNEA), Unidad de Actividad Radioquímica, Centro Atómico Ezeiza, Pro González y Aragón 15, Ezeiza, B1802AYA Buenos Aires, Argentina;3. Comisión Nacional de Energía Atómica (CNEA), Gerencia Química, Centro Atómico Constituyentes, Av. Gral. Paz 1499, San Martín, B1650KNA Buenos Aires, Argentina |
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| Abstract: | Sorption of unranium from nitrate solution on four hydrous oxides, namely, hydrous titanium, zirconium, cerium and thorium oxides (TiO2, ZrO2, CeO2, ThO2) has been studied at pH 3.5 as a function of uranyl concentration and temperature. The sorbed species was uranyl ion in the case of hydrous TiO2 and CeO2, while in the case of hydrous ZrO2 and ThO2, electrolyte sorption involving uranyl nitrate predominated. Sorption site densities calculated from saturation capacities, evaluated from Langmuir adsorption isotherm and surface areas, bear a direct relationship with the heat of sorption values. Results indicate that, in terms of sorption site density, hydrous CeO2 seems to be a better sorbent than hydrous TiO2 for the sorption of uranium. |
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