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Acta Phys. -Chim. Sin.  2016, Vol. 32 Issue (8): 1933-1940    DOI: 10.3866/PKU.WHXB201604212
Kinetics and Thermodynamics of Adsorption of Benzil-Bridged β-Cyclodextrin on Uranium(VI)
JING Peng-Fei, LIU Hui-Jun, ZHANG Qin, HU Sheng-Yong, LEI Lan-Lin, FENG Zhi-Yuan
College of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, Hunan Province, P. R. China
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Sulfated β-cyclodextrin (β-CD) was prepared by the reaction of β-CD with p-toluenesulfonyl chloride at low temperature in aqueous sodium hydroxide. The product was analyzed by Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (1H NMR). The novel benzil-bridged β-CD (BB β-CD) was acquired by the reaction of benzil with sulfated β-CD at a molar ratio of 1 : 2. UV spectrophotometry was used to study the synthetic mechanism of BB β-CD and benzil and their adsorption onto U(VI). Scanning electron microscopy (SEM) was used to analyze the surface properties of the materials. The adsorption of BB β-CD onto U(VI) was investigated as a function of pH, contact time, temperature, and interfering ions using the batch adsorption technique. It was found that the adsorption equilibrium of BB β-CD was reached faster than that of benzil. The optimum experimental conditions were pH = 4.5 and shaking for 60 min, achieving the maximum adsorption capacity of 12.16 mg·g-1 and a U(VI) removal ratio of 91.2%. Kinetic studies revealed that the adsorption reached equilibrium within 60 min for U(VI) and followed a pseudo-second-order rate equation. The isothermal data correlated with the Langmuir model better than with the Freundlich model. The thermodynamic data indicated the spontaneous and endothermic nature of the process.

Key wordsBB β-CD      Uranium(VI) adsorption      Kinetics      Equilibrium      Thermodynamics 1933     
Received: 04 January 2016      Published: 21 April 2016
MSC2000:  O642  

The project was supported by the National Natural Science Foundation of China (11375084) and Hunan Provincial Innovation Foundation for Postgraduate, China (CX2015B399).

Corresponding Authors: LIU Hui-Jun     E-mail:
Cite this article:

JING Peng-Fei, LIU Hui-Jun, ZHANG Qin, HU Sheng-Yong, LEI Lan-Lin, FENG Zhi-Yuan. Kinetics and Thermodynamics of Adsorption of Benzil-Bridged β-Cyclodextrin on Uranium(VI). Acta Phys. -Chim. Sin., 2016, 32(8): 1933-1940.

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