文献类型：期刊文献

英文题名：A novel multi-shelled Fe3O4@MnOx hollow microspheres for immobilizing U(VI) and Eu(III)

作者：Song, Shuang[1,2];Zhang, Sai[1];Huang, Shuyi[1];Zhang, Rui[1];Yin, Ling[1];Hu, Yezi[1];Wen, Tao[1];Zhuang, Li[1];Hu, Baowei[2];Wang, Xiangke[1,2]

机构：[1]North China Elect Power Univ, Coll Environm Sci & Engn, Beijing 102206, Peoples R China;[2]Shaoxing Univ, Sch Life Sci, Huancheng West Rd 508, Shaoxing 312000, Peoples R China

年份：2019

卷号：355

起止页码：697

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：SCI-EXPANDED(收录号：WOS:000445416900066)、、WOS

基金：This work is financially supported by Science Challenge Project (TZ2016004), National Key Research and Development Program of China (2017YFA0207002), NSFC (21836001, 21607042, 21577032, 21707033), the Fundamental Research Funds for Central Universities (2018ZD11, 2018MS114, 2017MS045).

语种：英文

外文关键词：Sorption; Multi-shelled Fe3O4@MnOx; U(VI); Eu(III); Spectroscopy

外文摘要：The leakage of radionuclides poses a great threat to the global ecosystem, which has aroused world-wide continuous attention. Since sorption plays the most important role in their environmental fate and humic acid (HA) is a key factor to their migration behavior, it is necessary to develop highly-efficient adsorbents that can remove radionuclides from the contaminated water in the presence of HA. Herein, we reported a novel multi-shelled Fe3O4@MnOx, which showed considerable sorption capacities towards uranium (U(VI)) and europium (Eu(III)). From the systemic batch experiments, the sorption kinetics follows the pseudo-second-order model, and sorption thermodynamics are endothermic processes. The sorption edges are pH-dependent but independent of ionic strength. Furthermore, the sorption isotherms are well described by the Langmuir model, giving maximum sorption capacities of 106.72 mg.g(-1) for U(VI) and 138.13 mg.g(-1) for Eu(III) at 298 K. Based on the spectroscopic studies, U(VI) is mainly adsorbed on the Mn-III-O-H site while Eu(III) shows higher affinity to the Mn-IV-O-H site. In the presence of humic acid (HA), the HAUO(2)(+) and (HA)(2)Eu+ species can accelerate the sorption kinetics and enhance the sorption capacities. This work can not only boost the exploration of adsorbent systems in the field of materials, but also promote the investigations of the interface reaction mechanism in the field of radiochemistry.