Journal
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
Volume 295, Issue 1, Pages 663-670Publisher
SPRINGER
DOI: 10.1007/s10967-012-1820-0
Keywords
Ordered mesoporous carbon; CMK-3; Adsorption; Uranium
Funding
- National Natural Science Foundation of China [21101024]
- Key Project of Chinese Ministry of Education [211086]
- Natural Science Foundation of Jiangxi Province [2010GQH 0015]
- Sci. & Tech. Project of Jiangxi Provincial department of education [GJJ11139]
- Open Project Foundation of the Key Laboratory of Radioactive Geology and Exploration Technology Fundamental Science for National Defense (East China Institute of Technology) [2010RGET08]
- Open Project Foundation of the Engineering Research Center of Nano-Geomaterials of Ministry of Education (China University of Geosciences) [CUGNGM201205]
- Open Project Foundation of the State Key Laboratory of Biogeology and Environmental Geology (China University of Geosciences) [BGEG201105]
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The ability of ordered mesoporous carbon CMK-3 has been explored for the removal and recovery of uraium from aqueous solutions. The textural properties of CMK-3 were characterized using small-angle X-ray diffraction and N-2 adsorption-desorption, and the BET specific surface area, pore volume and the pore size were 1143.7 m(2)/g, 1.10 cm(3)/g and 3.4 nm. The influences of different experimental parameters such as solution pH, initial concentration, contact time, ionic strength and temperature on adsorption were investigated. The CMK-3 showed the highest uranium sorption capacity at initial pH of 6.0 and contact time of 35 min. Adsorption kinetics was better described by the pseudo-second-order model and adsorption process could be well defined by the Langmuir and Freundlich isotherm. The thermodynamic parameters, a dagger GA degrees(298 K), a dagger HA degrees and a dagger SA degrees were determined to be -7.7, 21.5 k J mol(-1) and 98.2 J mol(-1) K-1, respectively, which demonstrated the sorption process of CMK-3 towards U(VI) was feasible, spontaneous and endothermic in nature. The adsorbed CMK-3 could be effectively regenerated by 0.05 mol/L HCl solution for the removal and recovery of U(VI). Complete removal (99.9 %) of U(VI) from 1.0 L industry wastewater containing 15.0 mg U(VI) ions was possible with 2.0 g CMK-3.
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