文献类型：期刊文献

英文题名：Preparation of core-shell structure Fe3O4@C@MnO2 nanoparticles for efficient elimination of U(VI) and Eu(III) ions

作者：Dai, Shuhui[1,2,3];Wang, Ning[1,3];Qi, Chenjia[3];Wang, Xiangxue[3];Ma, Yan[3];Yang, Lu[3];Liu, Xiaoyan[3];Huang, Qiang[3];Nie, Changming[1];Hu, Baowei[2];Wang, Xiangke[3]

机构：[1]Univ South China, Sch Chem & Chem Engn, 28 Chang Sheng West Rd, Hengyang 421001, Henan, Peoples R China;[2]Shaoxing Univ, Sch Life Sci, Huancheng West Rd 508, Shaoxing 312000, Peoples R China;[3]North China Elect Power Univ, Coll Environm Sci & Engn, Beijing 102206, Peoples R China

年份：2019

卷号：685

起止页码：986

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：SCI-EXPANDED(收录号：WOS:000477951900091)、、EI(收录号：20192607098924)、Scopus(收录号：2-s2.0-85067655652)、WOS

基金：We thank National Key Research and Development Program of China (2017YFA0207002) and National Natural Science Foundation of China (21836001, 21876048, 216048, 21607042) for their support of this work.

语种：英文

外文关键词：Fe3O4@C@MnO2; Elimination; U(VI); Eu(III); Pollution treatment

外文摘要：Radionuclide contamination has become an urgent problem with the development of nuclear power plants. Herein, chemical-decorated core-shell magnetic manganese dioxide (denoted as Fe3O4@C@MnO2) composites were synthesized via transforming KMnO4 to MnO2 on the carbon-covered magnetite (Fe3O4@C) microsphere surface. It was employed to remove U(VI) and Eu(III) ions from aqueous solution under various conditions. The kinetic adsorption data were well simulated by the pseudo-second-order model and adsorption isotherms were fitted well by Langmuir model. Moreover, the maximum uptake capacities were up to 77.71 mg/g for U (VI) and 51.01 mg/g for Eu(III) at pH = 5.0 and T = 298 K. Adsorption behavior was strongly related to pH values but weakly affected by ionic strength, implying that the interaction of U(VI)/Eu(III) with Fe3O4@C@MnO2 was mainly dominated by inner-sphere surface complexation. XPS analysis illustrated that the interaction of Eu (III)/U(VI) with Fe3O4@C@MnO2 was associated with the strong metal bonds (Mn-O), hydroxyl bonded on metal (Mn-OH) and carboxyl groups (-COOH) by surface complexation and zeta potential results implied that the adsorption process was governed by electrostatic attraction. This research highlighted the outstanding performance of Fe3O4@C@MnO(2)in eliminating Eu(III)/U(VI) ions from aqueous solutions, which was of great significance in the future application in radionuclides' pollution treatment. (C) 2019 Elsevier B.V. All rights reserved.