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首页> 外文期刊>RSC Advances >Adsorption and recovery of U(VI) from low concentration uranium solution by amidoxime modified Aspergillus niger
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Adsorption and recovery of U(VI) from low concentration uranium solution by amidoxime modified Aspergillus niger

机译：由酰胺改性的Aspergillus Niger从低浓度铀溶液中吸附和恢复U（VI）

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摘要

Amidoxime modified Aspergillus niger (AMAN) was prepared by the oximation reaction. The effects of the initial pH, contact time, initial U(VI) concentration and biosorbent dose on the adsorption of U(VI) ions from radioactive wastewater in U(VI) concentrations of less than 1 mg L-1 by AMAN and the raw Aspergillus niger (RAN) were investigated. The maximum adsorption efficiency by AMAN for the 0.5 mg L-1 U(VI) solution amounted to 98.85% under the optimum adsorption conditions, while the maximum adsorption efficiency by RAN was only 77.83%. The adsorption equilibrium data were found to be best fitted to Langmuir isotherm model, and the maximum biosorption capacity of AMAN for U(VI) was estimated to be 621 mg g(-1) at 298 K. The biosorption kinetics followed the pseudo-second order model and intraparticle diffusion equation. The Gibbs free energy change (Delta G degrees), enthalpy change (Delta H degrees) and entropy change (Delta S degrees) showed that the adsorption process of U(VI) was spontaneous, feasible and endothermic. The SEM-EDS study indicated that much more U(VI) ions were adsorbed by AMAN than by RAN. FT-IR study showed that the -NH2 and =N-OH groups of amidoxime were the dominant ones for binding UO22+ ions. Moreover, AMAN was found to have excellent selective adsorption capability of U(VI) due to amidoxime groups. The UO22+ ions adsorbed by AMAN could be desorbed using 0.1 M HCl, and the desorption efficiency reaching 87.28% at the 8th cycle of adsorption and desorption.
机译：通过肟化反应制备amidoxime改性曲霉（Aman）。初始pH，接触时间，初始U（VI）浓度和生物吸附剂对U（VI）浓度低于1mg L-1的放射性废水的U（VI）离子的吸附对U（VI）浓度的影响，通过Aman和Raw研究了曲霉（RAN）。在最佳吸附条件下，AMAN的最大吸附效率为0.5mg L-1 U（VI）溶液在98.85％，而RAN的最大吸附效率仅为77.83％。发现吸附平衡数据最适合Langmuir等温模型，并且在298k估计u（vi）的最大生物吸收容量为621mg g（-1）。生物吸收动力学遵循伪秒秩序模型和桐穴扩散方程。 Gibbs自由能量变化（Delta G度），焓变（Delta H度）和熵变（Delta S Degete）表明，U（VI）的吸附过程是自发的，可行和吸热的。 SEM-EDS研究表明，更多的U（VI）离子被Aman吸附而不是RAN。 FT-IR的研究表明 - NH 2和= N-OH基团的偕胺肟是用于结合UO 2 2 +离子的主要肟。此外，由于偕胺肟基团，发现阿曼具有优异的U（VI）的选择性吸附能力。由Aman吸附的UO22 +离子可以使用0.1M HCl解吸，并在第8次吸附和解吸的循环中达到87.28％的解吸效率。

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  • 来源
    《RSC Advances》 |2015年第81期|共13页
  • 作者

    Li Le; Hu Nan; Ding Dexin; Xin Xin; Wang Yongdong; Xue Jinhua; Zhang Hui; Tan Yan;

  • 作者单位

    Univ South China Key Discipline Lab Natl Def Biotechnol Uranium Mi Hengyang 421001 Peoples R China;

    Univ South China Key Discipline Lab Natl Def Biotechnol Uranium Mi Hengyang 421001 Peoples R China;

    Univ South China Key Discipline Lab Natl Def Biotechnol Uranium Mi Hengyang 421001 Peoples R China;

    Univ South China Key Discipline Lab Natl Def Biotechnol Uranium Mi Hengyang 421001 Peoples R China;

    Univ South China Key Discipline Lab Natl Def Biotechnol Uranium Mi Hengyang 421001 Peoples R China;

    Univ South China Key Discipline Lab Natl Def Biotechnol Uranium Mi Hengyang 421001 Peoples R China;

    Univ South China Key Discipline Lab Natl Def Biotechnol Uranium Mi Hengyang 421001 Peoples R China;

    Univ South China Key Discipline Lab Natl Def Biotechnol Uranium Mi Hengyang 421001 Peoples R China;

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