文献类型：期刊文献

英文题名：Unexpected ultrafast elimination of uranium and europium from aqueous solutions with magnetic bio-CaCO3

作者：Xiong, Huiyan[1,2]; Chen, Jiemin[1]; Zhang, Tingting[1,2]; Wang, Wenzhong[1,2]; Huang, Chengcai[1]; Zhu, Yuling[1]; Hu, Baowei[1]

机构：[1] School of Life Science, School of Civil Engineering, Shaoxing University, Huancheng West Road 508, Shaoxing, 312000, China; [2] School of Civil Engineering, Shaoxing University, Huancheng West Road 508, Shaoxing, 312000, China

年份：2021

卷号：322

外文期刊名：Journal of Molecular Liquids

收录：EI(收录号：20205209671746)、Scopus(收录号：2-s2.0-85097895098)

语种：英文

外文关键词：Calcite - Energy dispersive spectroscopy - Scanning electron microscopy - X ray diffraction - Fourier transform infrared spectroscopy - Transmission electron microscopy - Europium compounds - Magnetite - Adsorption - X ray photoelectron spectroscopy - Magnetism

外文摘要：In this investigation, the magnetic bio-CaCO3 were synthesized and elimination of uranium and europium from aqueous solutions. The prepared magnetic composite underwent a series of characterization analyses, such as Transmission electron microscope (TEM), Scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), which prove that the magnetic particles are successfully modified on bio-CaCO3. Surprisingly, it was found that coating the bio-CaCO3 with Fe3O4 not only increased the distance between the calcium carbonate nanosheets but also ensured the presence of Fe–O active groups on the bio-CaCO3 surface. The sorption of U(VI)/Eu(III) on the magnetic bio-CaCO3 as a function of the pH, adsorbent dose, shaking time, co-existing ions, and the temperature was investigated using batch experiments. The effect of pH was investigated showing optimum sorption at pH 5 for U(VI) and Eu(III). The adsorption kinetics is relatively fast and can reach equilibrium in 60 to 90 min, and the pseudo-second-order rate equation preferentially fits the kinetic distribution, suggesting chemisorption was involved. The maximum adsorption amounts were 122.66 mg·g?1 for U(VI) and 130.62 mg·g?1 for Eu(III) at pH 5.0 and 298 K. The adsorption mechanism, which was evaluated with XRD, FTIR, SEM-EDS, and XPS, demonstrated that the functional groups (O–H, -NH2, CO32? and O–Fe) and the increased hierarchical distances were primarily responsible for the improved adsorption ability. This paper highlights magnetic bio-CaCO3 as potential, eco-friendly and ultrahigh-efficiency materials for uranium and europium pollution cleanup. ? 2020