文献类型：期刊文献

英文题名：Mechanistic insights into sequestration of U(VI) toward magnetic biochar: Batch, XPS and EXAFS techniques

作者：Hu, Qingyuan[1];Zhu, Yuling[1];Hu, Baowei[1];Lu, Songhua[2];Sheng, Guodong[1]

机构：[1]Shaoxing Univ, Coll Chem & Chem Engn, Coll Life Sci, Shaoxing 312000, Zhejiang, Peoples R China;[2]Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China

年份：2018

卷号：70

起止页码：217

外文期刊名：JOURNAL OF ENVIRONMENTAL SCIENCES

收录：SCI-EXPANDED(收录号：WOS:000457080600001)、、EI(收录号：20180604764984)、Scopus(收录号：2-s2.0-85041589448)、WOS

基金：This work was supported by the National Natural Science Foundation of China (Nos. 21207092, 21577093) and the Science and Technology Project of Shaoxing (No. 2014B70041).

语种：英文

外文关键词：Magnetic biochar; Uranium; X-ray absorption spectroscopy; Sequestration

外文摘要：The magnetic iron oxide (Fe3O4) nanoparticles stabilized on the biochar were synthesized by fast pyrolysis of Fe(II)-loaded hydrophyte biomass under N2 conditions. The batch experiments showed that magnetic biochar presented a large removal capacity (54.35 mg/g) at pH 3.0 and 293 K. The reductive co-precipitation of U(VI) to U(IV) by magnetic biochar was demonstrated according to X-ray diffraction, X-ray photoelectron spectroscopy and X-ray absorption near edge structure analysis. According to extendedX-ray absorption fine structure analysis, the occurrence of U-Fe and U-U shells indicated that high effective removal of uranium was primarily inner-sphere coordination and then reductive co-precipitation at low pH. These observations provided the further understanding of uranium removal bymagnetic materials in environmental remediation. (c) 2018 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.