Removal of thorium from aqueous solution by ordered mesoporous carbon CMK-3 |
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Authors: | Zhi-bin Zhang Yi-dong Zhou Yun-Hai Liu Xiao-hong Cao Zhi-wei Zhou Bin Han Ping Liang Guo-xuan Xiong |
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Institution: | 1. Health Physics Unit, Health Physics Division, Bhabha Atomic Research Centre, P.O. M. C. Palle, Kadapa District, 516349, India 2. Health Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
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Abstract: | The ability of ordered mesoporous carbon CMK-3 has been explored for the removal and recovery of thorium from aqueous solutions. The textural properties of CMK-3 were characterized using small-angle X-ray diffraction and N2 adsorption–desorption, and the BET specific surface area, pore volume and the pore size were 1143.7 m2/g, 1.10 cm3/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 thorium sorption capacity at initial pH of 3.0 and contact time of 175 min. Adsorption kinetics was better described by the pseudo-second-order model and adsorption process could be well defined by the Langmuir isotherm. The thermodynamic parameters, △G°(298 K), △H° and △S° were determined to be -0.74 kJ·mol?1, 9.17 kJ·mol?1 and 33.24 J·mol?1·K?1, respectively, which demonstrated the sorption process of CMK-3 towards Th(IV) was feasible, spontaneous and endothermic in nature. The adsorbed CMK-3 could be effectively regenerated by 0.02 mol/L HCl solution for the removal and recovery of Th(IV). |
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