Removal of uranium(VI) from aqueous solution using citric acid modified pine sawdust: batch and column studies |
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Authors: | Weihua Zou Lei Zhao |
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Institution: | (1) School of Chemical Engineering and Energy, Zhengzhou University, 100# of Kexue Road, Zhengzhou, 450001, People’s Republic of China |
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Abstract: | This study described adsorption of uranium(VI) by citric acid modified pine sawdust (CAMPS) in batch and fixed-bed column
modes at 295 K. The equilibrium adsorption data were analyzed by Langmuir, Freundlich, Koble–Corrigan and Dubinin–Radushkevich
isotherm models. The results indicated that the Langmuir and Koble–Corrigan models provided the best correlation of the experimental
data. The Elovish model was better to fit the kinetic process, which suggested that ion exchange was one of main mechanism.
The effective diffusion parameter D
i
values indicated that the intraparticle diffusion was not the rate-controlling step. In fixed-bed column adsorption, the
effects of bed height, feed flow rate, and inlet uranium (VI) concentration were studied by assessing breakthrough curve.
The Thomas, the Yan and the bed-depth/service time (BDST) models were applied to the column experimental data to determine
the characteristic parameters of the column adsorption. The results were implied that CAMPS may be suitable as an adsorbent
material for adsorption of uranium (VI) from an aqueous solution. |
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Keywords: | |
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