Journal of Radiation Research and Radiation Proces ›› 2017, Vol. 35 ›› Issue (5): 50301-050301.doi: 10.11889/j.1000-3436.2017.rrj.35.050301

• RADIATION CHEMISTRY • Previous Articles     Next Articles

Pyridine-modified fibrous mesoporous silica microspheres prepared through radiation-induced grafting polymerization and their adsorption property to U(VI)

ZHAO Chi2, WENG Hanqin1,2, WANG Mozhen2, GE Xuewu2, LIN Mingzhang1   

  1. 1 School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230027, China;
    2 CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China
  • Received:2017-04-17 Revised:2017-05-04 Online:2017-10-20 Published:2017-10-20
  • Supported by:

    Supported by the Natural Science Foundation of Anhui Province of China (1708085QA21), China Postdoctoral Science Foundation (2016M592069), and the Fundamental Research Funds for the Central Universities (WK2140000009)


In this paper, double-bond-modified fibrous mesoporous silica (F-SiO2-K) microspheres were prepared first, and then grafted with poly (4-vinylpyridine) (P(4-VP)) in 4-VP or its methanol solution initiated by γ-ray irradiation to obtain pyridine modified mesoporous silica (F-SiO2-VP) microspheres. The Fourier transform infrared spectroscopy (FTIR) and thermal gravimetric analysis (TGA) results indicated the successful grafting of P(4-VP). The degree of grafting (DG) of P(4-VP), which was calculated from TGA curves, increased with the monomer concentration and the absorbed dose, however reached a maximum value at a moderate dose rate. The adsorption ability of F-SiO2-VP for U(VI) in nitric acid solution was investigated. The results show that the adsorption capacity is related to the concentration of nitric acid and the DG of F-SiO2-VP, and reaches a maximum of 163 mg/g. The adsorption kinetics fits the pseudo-second-order model, and the adsorption isotherm of F-SiO2-VP fits the Freundlich model at low U(VI) concentrations and the Langmuir isotherm well at high U(VI) concentrations.

Key words: γ-ray, Radiation grafting, Mesoporous silica, 4-vinylpyridine, Uranium

CLC Number: 

  • TL13