Citation: 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)[J]. Acta Physico-Chimica Sinica, ;2016, 32(8): 1933-1940. doi: 10.3866/PKU.WHXB201604212 shu

Kinetics and Thermodynamics of Adsorption of Benzil-Bridged β-Cyclodextrin on Uranium(VI)

College of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, Hunan Province, P. R. China

Received Date: 4 January 2016
Revised Date: 20 April 2016

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

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.
- BB β-CD,
- Uranium(VI) adsorption,
- Kinetics,
- Equilibrium,
- Thermodynamics 1933
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