期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 295, 期 -, 页码 127-137出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2015.04.032
关键词
Fe3O4; Bio-nanocomposites; Adsorbents; Radionuclides; Sorption
资金
- National Natural Science Foundation of China [21207135, 91126020, 21225730, 91326202, 41273134]
- Anhui Provincial Natural Science Foundation [1408085MB28]
- Jiangsu Provincial Key Laboratory of Radiation Medicine and Protection Institutions
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Hefei Center for Physical Science and Technology [2012FXZY005]
The bio-nanocomposites of fungus-Fe3O4 were successfully synthesized using a low-cost self-assembly technique. SEM images showed uniform decoration of nano-Fe3O4 particles on fungus surface. The FTIR analysis indicated that nano-Fe3O4 was combined to the fungus surface by chemical bonds. The sorption ability of fungus-Fe3O4 toward Sr(II), Th(IV) and U(VI) was evaluated by batch techniques. Radionuclide sorption on fungus-Fe3O4 was independent of ionic strength, indicating that inner-sphere surface complexion dominated their sorption. XPS analysis indicated that the inner-sphere radionuclide complexes were formed by mainly bonding with oxygen-containing functional groups (i.e., alcohol, acetal and carboxyl) of fungus-Fe3O4. The maximum sorption capacities of fungus-Fe3O4 calculated from Langmuir isotherm model were 100.9, 223.9 and 280.8 mg/g for Sr(II) and U(VI) at pH 5.0, and Th(IV) at pH 3.0, respectively, at 303 K. Fungus-Fe3O4 also exhibited excellent regeneration performance for the preconcentration of radionuclides. The calculated thermodynamic parameters showed that the sorption of radionuclides on fungus-Fe3O4 was a spontaneous and endothermic process. The findings herein highlight the novel synthesis method of fungus-Fe3O4 and its high sorption ability for radionuclides. (C) 2015 Elsevier B.V. All rights reserved.
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