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)

Abstract:

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