Abstract
Activated palm kernel shell carbon (APKSC) was used to remove U(VI) from aqueous solutions in a batch system. The adsorption kinetics, isotherms, and effects of various parameters, such as temperature, contact time, solution pH, adsorbent dosage, and initial U(VI) concentration on the U(VI) adsorption process were studied. Equilibrium was reached after 120 min in the range of studied U(VI) concentrations and temperatures. U(VI) uptake was insignificantly affected by temperature, but was highly pH dependent, and the optimum pH for removal was 5.5. U(VI) removal efficiency increased with the increasing adsorbent dosage. U(VI) sorption capacity increased with increasing initial U(VI) concentration; any further increases in initial U(VI) concentration above a certain point caused insignificant changes in U(VI) sorption capacity. Isotherm data could be described by the Langmuir isotherm model with a maximum U(VI) adsorption capacity of 51.81 mg/g. Kinetic data were fitted to pseudo-first-order and pseudo-second-order equations, which suggested that the U(VI) adsorption onto APKSC was better reproduced by the pseudo-second-order model rather than pseudo-first-order model. Our results indicated that APKSC might be used as a cheap adsorbent in the treatment of uranium-containing wastewater.
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Acknowledgments
This work was supported in part by grants from the Key Project of Science and Technology Plan of Hunan Province (2012FJ2002), the International Joint Key Project from Chinese Ministry of Science and Technology (2010DFB23160), National Natural Science Foundation of China (41273092 and 41273131) and China Postdoctoral Science Foundation (2012M510322).
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Yi, Zj., Yao, J., Xu, Js. et al. Removal of uranium from aqueous solution by using activated palm kernel shell carbon: adsorption equilibrium and kinetics. J Radioanal Nucl Chem 301, 695–701 (2014). https://doi.org/10.1007/s10967-014-3242-7
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DOI: https://doi.org/10.1007/s10967-014-3242-7