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Constructing Uranyl-Specific Nanofluidic Channels for Unipolar Ionic Transport to Realize Ultrafast Uranium Extraction
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2021-09-05 , DOI: 10.1021/jacs.1c02592 Zeyu Wang 1 , Rongchen Ma 1 , Qinghao Meng 1 , Yajie Yang 1 , Xujiao Ma 1 , Xianghui Ruan 1 , Ye Yuan 1 , Guangshan Zhu 1
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2021-09-05 , DOI: 10.1021/jacs.1c02592 Zeyu Wang 1 , Rongchen Ma 1 , Qinghao Meng 1 , Yajie Yang 1 , Xujiao Ma 1 , Xianghui Ruan 1 , Ye Yuan 1 , Guangshan Zhu 1
Affiliation
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High-speed capturing of uranyl (UO22+) ions from seawater elicits unprecedented interest for the sustainable development of the nuclear energy industry. However, the ultralow concentration (∼3.3 μg L–1) of uranium element leads to the slow ion diffusion inside the adsorbent particle, especially after the transfer paths are occupied by the coexisted interfering ions. Considering the geometric dimension of UO22+ ion (a maximum length of 6.04–6.84 Å), the interlayer spacing of graphene sheets was covalently pillared with phenyl-based units into twice the ionic length (13 Å) to obtain uranyl-specific nanofluidic channels. Applying a negative potential (−1.3 V), such a charge-governed region facilitates a unipolar ionic transport, where cations are greatly accelerated and co-ions are repelled. Notably, the resulting adsorbent gives the highest adsorption velocity among all reported materials. The adsorption capacity measured after 56 days of exposure in natural seawater is evaluated to be ∼16 mg g–1. This novel concept with rapid adsorption, high capacity, and facile operating process shows great promise to implement in real-world uranium extraction.
中文翻译：
构建用于单极离子传输的铀特异性纳米流体通道以实现超快铀提取
从海水中高速捕获铀酰 (UO 2 2+ ) 离子引起了核能工业可持续发展的空前关注。然而，铀元素的超低浓度（~3.3 μg L –1）导致吸附剂颗粒内部的离子扩散缓慢，特别是在传输路径被共存的干扰离子占据之后。考虑到 UO 2 2+的几何尺寸离子（最大长度为 6.04–6.84 Å），石墨烯片的层间距与基于苯基的单元共价柱连接成两倍的离子长度（13 Å），以获得铀酰特异性纳米流体通道。施加负电位 (-1.3 V)，这样的电荷控制区域促进了单极离子传输，其中阳离子被大大加速并且共离子被排斥。值得注意的是，所得吸附剂在所有报道的材料中具有最高的吸附速度。在天然海水中暴露 56 天后测得的吸附容量约为 16 mg g –1。这种具有快速吸附、高容量和简便操作过程的新概念显示出在实际铀提取中实施的巨大希望。
更新日期：2021-09-15
中文翻译：
构建用于单极离子传输的铀特异性纳米流体通道以实现超快铀提取
从海水中高速捕获铀酰 (UO 2 2+ ) 离子引起了核能工业可持续发展的空前关注。然而，铀元素的超低浓度（~3.3 μg L –1）导致吸附剂颗粒内部的离子扩散缓慢，特别是在传输路径被共存的干扰离子占据之后。考虑到 UO 2 2+的几何尺寸离子（最大长度为 6.04–6.84 Å），石墨烯片的层间距与基于苯基的单元共价柱连接成两倍的离子长度（13 Å），以获得铀酰特异性纳米流体通道。施加负电位 (-1.3 V)，这样的电荷控制区域促进了单极离子传输，其中阳离子被大大加速并且共离子被排斥。值得注意的是，所得吸附剂在所有报道的材料中具有最高的吸附速度。在天然海水中暴露 56 天后测得的吸附容量约为 16 mg g –1。这种具有快速吸附、高容量和简便操作过程的新概念显示出在实际铀提取中实施的巨大希望。
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