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Synergistic nanofibrous adsorbent for uranium extraction from seawater

机译：海水中铀提取的协同纳米纤维吸附剂

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摘要

Huge reserves of uranium (U) in seawater have been of interest to scientists and energy companies since the 1950s. However, extracting trace concentrations (3.3 ppb) of U from seawater is economically unfeasible without new, high-performance adsorbents. Here, a mat-like nanofibrous composite adsorbent containing binary coordination groups (amidoxime (AO) and carboxyl (AC(-))) in a highly porous network of nanofibers is constructed via a parallel-blend electrospinning method. Its U uptake in artificial seawater is more than double those of adsorbents containing AO or AC(-) groups alone. Density functional theory (DFT) calculations reveal that this synergistic effect is because the AC(-) group promotes both the U 5f/6d orbital contribution to U-AO bonding and the dissociation of uranyl tricarbonate ions in seawater. In a continuous flow-through experiment with simulated seawater, the nanofibrous adsorbent achieves an adsorption capacity up to 2.86 mg U g(ads)(-1) in 30 d but without saturation, indicating a high efficiency for U extraction.
机译：自20世纪50年代以来，海水中的铀（U）铀（U）的巨额储备对科学家和能源公司感到兴趣。然而，没有新的高性能吸附剂，从海水中提取来自海水的痕量浓度（3.3ppb）在经济上是不可行的。这里，通过平行共混电刺纺丝方法构建含有二元配合基团（偕胺肟（AO）和羧基（Ac（ - ）和羧基（Ac（ - ）））的垫状纳米纤维复合吸附剂。它的人工海水吸收不仅仅是单独含有AO或AC（ - ）组的吸附剂的两倍多。密度函数理论（DFT）计算表明，这种协同效应是因为AC（ - ）组促进U-AO键合的U 5F / 6D轨道贡献以及海水中铀三烷基酯离子的解离。在具有模拟海水的连续流动实验中，纳米纤维吸附剂在30d但没有饱和的情况下实现高达2.86mg Ug（ - 1）的吸附能力，表明对U提取的高效率。

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  • 来源
    《RSC Advances》 |2016年第85期|共11页
  • 作者

    Zhang Bowu; Guo Xiaojing; Xie Siyuan; Liu Xiyan; Ling Changjian; Ma Hongjuan; Yu Ming; Li Jingye;

  • 作者单位

    Chinese Acad Sci Shanghai Inst Appl Phys CAS Ctr Innovat Adv Nucl Energy 2019 Jialuo Rd Shanghai 201800 Peoples R China;

    Chinese Acad Sci Shanghai Inst Appl Phys CAS Ctr Innovat Adv Nucl Energy 2019 Jialuo Rd Shanghai 201800 Peoples R China;

    Chinese Acad Sci Shanghai Inst Appl Phys CAS Ctr Innovat Adv Nucl Energy 2019 Jialuo Rd Shanghai 201800 Peoples R China;

    Chinese Acad Sci Shanghai Inst Appl Phys CAS Ctr Innovat Adv Nucl Energy 2019 Jialuo Rd Shanghai 201800 Peoples R China;

    Chinese Acad Sci Shanghai Inst Appl Phys CAS Ctr Innovat Adv Nucl Energy 2019 Jialuo Rd Shanghai 201800 Peoples R China;

    Chinese Acad Sci Shanghai Inst Appl Phys CAS Ctr Innovat Adv Nucl Energy 2019 Jialuo Rd Shanghai 201800 Peoples R China;

    Chinese Acad Sci Shanghai Inst Appl Phys CAS Ctr Innovat Adv Nucl Energy 2019 Jialuo Rd Shanghai 201800 Peoples R China;

    Chinese Acad Sci Shanghai Inst Appl Phys CAS Ctr Innovat Adv Nucl Energy 2019 Jialuo Rd Shanghai 201800 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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