Adsorption of Eu(III) and Th(IV) on three-dimensional graphene-based macrostructure studied by spectroscopic investigation
Adsorption of Eu(III) and Th(IV) on three-dimensional graphene-based macrostructure studied by spectroscopic investigation
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通过光谱研究研究三维石墨烯基宏观结构上 Eu(III) 和 Th(IV) 的吸附
DOI：
10.1016/j.envpol.2019.01.050
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发表时间：
2019-05-01
影响因子：
8.9
通讯作者：
Shi, Wei-Qun
中科院分区：
文献类型：
--
作者：
Huang, Zhi-Wei;Li, Zi-Jie;Shi, Wei-Qun
核能发展引发争议的最重要原因之一就是乏燃料的妥善处理。榄系元素和镧系元素的分离是放射性废物安全长期储存的重要组成部分。本文利用一种基于石墨烯的三维宏观结构(GOCs)来去除水溶液中的榄系元素钍和镧系元素Eu离子。研究了Eu(III)和Th(IV)在GOCs上的吸附与吸附时间、溶液pH、初始离子浓度和离子强度的关系。实验测得该GOCs对Eu(III)(pH 6.0)和Th(IV)(pH 3.0)的最大吸附容量分别高达150和220mgig。通过傅立叶变换红外光谱(FT-IR)、X射线光电子能谱(XPS)和扩展X射线吸收精细结构谱(EXAFS)分析表明，Eu(III)和Th(IV)的吸附主要是通过与GOCs表面各种含氧、含氮官能团的内球配位实现的。我们的选择性吸附结果表明，该体系能有效地分离过渡金属离子中的榄系元素和镧系元素。这项研究为放射性环境污染治理中榄系和镧系离子的整体回收提供了新的线索。(C)2019爱思唯尔有限公司。保留所有权利。
One of the most important reasons for the controversy over the development of nuclear energy is the proper disposal of spent fuel. Separation of actinide and lanthanide ions is an important part of safe long-term storage of radioactive waste. Herein, a three-dimensional (3D) graphene-based macrostructure (GOCS) was utilized to remove actinide thorium and lanthanide europium ions from aqueous solutions. The adsorption of Eu(III) and Th(IV) on the GOCS was evaluated as a function of adsorption time, solution pH, initial ion concentrations, and ionic strength. The experimentally determined maximum adsorption capacities of this GOCS for Eu(III) (pH 6.0) and Th(IV) (pH 3.0) are as high as 150 and 220 mgig, respectively. By using Fourier transformation infrared (FT-IR), X-ray photoelectron (XPS), and extended X-ray absorption fine structure (EXAFS) spectroscopy, we concluded that the Eu(III) and Th(IV) adsorption was predominantly attributed to the inner-sphere coordination with various oxygen- and nitrogen-containing functional groups on GOCS surfaces. Our selective adsorption results demonstrate that the actinide and lanthanide ions can be effectively separated from transition metal ions. This study provides new clues to the overall recycling of actinide and lanthanide ions in radioactive environmental pollution treatments. (C) 2019 Elsevier Ltd. All rights reserved.