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3730448 
Journal Article 
Adsorption of uranium from aqueous solution using biochar produced by hydrothermal carbonization 
Zhang, Zhibin; Cao, XH; Liang, P; Liu, Yunhai 
2013 
Yes 
Journal of Radioanalytical and Nuclear Chemistry
ISSN: 0236-5731
EISSN: 1588-2780 
295 
1201-1208 
The ability of biochar produced by hydrothermal carbonization (HTC) has been explored for the removal and recovery of uranium from aqueous solutions. The micro-morphology and structure of HTC were characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. The influences of different experimental parameters such as solution pH, initial concentration, contact time, ionic strength and temperature on adsorption were investigated. The HTC showed the highest uranium sorption capacity at initial pH of 6.0 and contact time of 50 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, a-(3)GA degrees(298 K), a-(3)HA degrees and a-(3)SA degrees were determined to be -14.4, 36.1 kJ mol(-1) and 169.7 J mol(-1) K-1, respectively, which demonstrated the sorption process of HTC towards U(VI) was feasible, spontaneous and endothermic in nature. The adsorbed HTC 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 HTC. 
Biochar; Hydrothermal carbonization; Adsorption; Uranium 
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