Novel fungus-Fe3O4 bio-nanocomposites as high performance adsorbents for the removal of radionuclides
Novel fungus-Fe3O4 bio-nanocomposites as high performance adsorbents for the removal of radionuclides
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新型真菌-Fe3O4生物纳米复合材料作为去除放射性核素的高性能吸附剂
DOI：
10.1016/j.jhazmat.2015.04.032
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发表时间：
2015-09-15
影响因子：
13.6
通讯作者：
Wang, Xiangke
中科院分区：
文献类型：
--
作者：
Ding, Congcong;Cheng, Wencai;Wang, Xiangke
采用低成本的自组装技术成功合成了真菌-Fe 3 O 4生物纳米复合材料。SEM照片显示纳米Fe 3 O 4颗粒均匀地修饰在真菌表面。红外光谱分析表明，纳米Fe 3 O 4以化学键的形式结合在真菌表面。采用间歇吸附法研究了真菌-Fe_3O_4对Sr（II）、Th（IV）和U（VI）的吸附能力。放射性核素在真菌-Fe_3O_4上的吸附与离子强度无关，表明真菌的内球表面络合作用决定了其吸附。XPS分析表明，内球放射性核素络合物主要通过与含氧官能团（即，醇、缩醛和羧基）。利用Langmuir等温吸附模型计算了真菌-Fe 3 O 4在303 K时对Sr（II）、U（VI）和Th（IV）的最大吸附容量，在pH 5.0时分别为100.9、223.9和280.8 mg/g。真菌-Fe 3 O 4也表现出良好的再生性能的放射性核素的预浓缩。计算的热力学参数表明，真菌-Fe_3O_4吸附放射性核素是一个自发的吸热过程。本文的研究结果突出了真菌-Fe 3 O 4的新型合成方法及其对放射性核素的高吸附能力。(C)2015 Elsevier B. V.版权所有。
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.