杂原子
石墨烯
铀
吸附
密度泛函理论
离子键合
水溶液
X射线光电子能谱
碳纤维
材料科学
铀酰
共价键
化学工程
离子
纳米技术
化学
复合数
物理化学
戒指(化学)
有机化学
计算化学
冶金
复合材料
工程类
作者
Zhe Chen,Wanying Chen,Dashuang Jia,Yang Liu,Anrui Zhang,Tao Wen,Jian Liu,Yuejie Ai,Weiguo Song,Xiangke Wang
标识
DOI:10.1002/advs.201800235
摘要
Abstract The development of functional materials for the highly efficient capture of radionuclides, such as uranium from nuclear waste solutions, is an important and challenging topic. Here, few‐layered N, P, and S codoped graphene‐like carbon nanosheets (NPS‐GLCs) that are fabricated in the 2D confined spacing of silicate RUB‐15 and applied as sorbents to remove U(VI)ions from aqueous solutions are presented. The NPS‐GLCs exhibit a large capacity, wide pH suitability, an ultrafast removal rate, stability at high ionic strengths, and excellent selectivity for U(VI) as compared to multiple competing metal ions. The 2D ultrathin structure of NPS‐GLCs with large spacing of 1 nm not only assures the rapid mass diffusion, but also exposes a sufficient active site for the adsorption. Strong covalent bonds such as POU and SOU are generated between the heteroatom (N, P, S) with UO 2 2+ according to X‐ray photoelectron spectroscopy analysis and density functional theory theoretical calculations. This work highlights the interaction mechanism of low oxidation state heteroatoms with UO 2 2+ , thereby shedding light on the material design of uranium immobilization in the pollution cleanup of radionuclides.
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