title: Novel fungus-Fe3O4 bio-nanocomposites as high performance adsorbents for the removal of radionuclides.
abstract: 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.
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Science, P.O. Box 1126, Hefei 230031, PR China; University of Science and Technology of China, Hefei 230000, PR China.
authors.forename: Congcong
authors.initials: C
authors.lastname: Ding
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Science, P.O. Box 1126, Hefei 230031, PR China.
authors.forename: Wencai
authors.initials: W
authors.lastname: Cheng
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Science, P.O. Box 1126, Hefei 230031, PR China; School for Radiological and Interdisciplinary Sciences (RAD-X), Soochow University and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, 215123 Suzhou, PR China; School of Environment and Chemical Engineering, North China Electric Power University, Beijing 102206, PR China. Electronic address: sunyb@ipp.ac.cn.
authors.forename: Yubing
authors.initials: Y
authors.lastname: Sun
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Science, P.O. Box 1126, Hefei 230031, PR China; School for Radiological and Interdisciplinary Sciences (RAD-X), Soochow University and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, 215123 Suzhou, PR China; School of Environment and Chemical Engineering, North China Electric Power University, Beijing 102206, PR China; Faculty of Engineering, King Abdulaziz University, Jeddah 21589, Saudi Arabia. Electronic address: xkwang@ipp.ac.cn.
authors.forename: Xiangke
authors.initials: X
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry*; D009994:Osmolar Concentration; D010407:Penicillium / Q000737:chemistry*; D011868:Radioisotopes / Q000302:isolation & purification*
chemical_list: D058185:Magnetite Nanoparticles; D011868:Radioisotopes
keywords: Adsorbents; Bio-nanocomposites; Fe(3)O(4); Radionuclides; Sorption