期刊
CHEMICAL ENGINEERING JOURNAL
卷 246, 期 -, 页码 268-276出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2014.02.101
关键词
U(VI); Fe3O4; Polyacrylamide; Sorption
资金
- National Natural Science Foundation of China [21207136, 21107115, 21377132]
- Science Foundation of Institute of Plasma Physics, Chinese Academy of Sciences [DSJJ-13-YY01]
In this study, polyacrylamide was coated onto Fe3O4 to prepare novel polyacrylamide coated-Fe3O4 magnetic composites (denoted as Fe3O4@PAM). The as-prepared composites were characterized by Fourier transferred infrared spectroscopy, X-ray diffraction, and thermo gravimetric analysis, and the results indicated that polyacrylamide was successfully coated on the surface of Fe3O4. And Fe3O4@PAM composites were applied as adsorbents to remove U(VI) from aqueous solutions and it could be separated by a simple magnetic separation method. The sorption isotherms were well fitted by the Langmuir sorption isotherms, and the maximum sorption capacity of Fe3O4@PAM for U(VI) at pH 5.0 was calculated to be 220.9 mg/g. According to the XPS analysis of Fe3O4@PAM before and after U(VI) sorption, the nitrogencontaining functional groups on the surface of Fe3O4@PAM were responsible for U(VI) sorption. The U(VI) sorbed onto Fe3O4@PAM could be desorbed effectively in acid solutions, and the sorption capacity of regenerated sorbents could still maintain high level even after five cycles. The results showed that the Fe3O4@PAM composites were promising materials for the separation and enrichment of radionuclides from aqueous solution in environmental pollution cleanup. (C) 2014 Elsevier B.V. All rights reserved.
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