文献类型：期刊文献

英文题名：Plasma-enhanced amidoxime/magnetic graphene oxide for efficient enrichment of U(VI) investigated by EXAFS and modeling techniques

作者：Hu, Baowei[1];Guo, Xiaojie[2];Zheng, Cong[1];Song, Gang[3];Chen, Diyun[3];Zhu, Yuling[1];Song, Xiaofei[4];Sun, Yubing[5]

机构：[1]Shaoxing Univ, Sch Life Sci, Huancheng West Rd 508, Shaoxing 312000, Peoples R China;[2]Hangzhou Dianzi Univ, Coll Mat & Environm Engn, Hangzhou 310018, Zhejiang, Peoples R China;[3]Guangzhou Univ, Guangdong Prov Key Lab Radionuclides Pollut Contr, Guangzhou 510006, Guangdong, Peoples R China;[4]South China Univ Technol, Sch Environm & Energy, Guangzhou 510006, Guangdong, Peoples R China;[5]North China Elect Power Univ, Coll Environm Sci & Engn, Beijing 102206, Peoples R China

年份：2019

卷号：357

起止页码：66

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：SCI-EXPANDED(收录号：WOS:000448181000007)、、EI(收录号：20183905869417)、Scopus(收录号：2-s2.0-85053799524)、WOS

基金：Financial support from the Research Fund Program of National Nature Science Foundation of China (No. 21822602; 21876115) and Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources (GZDX2017K002), the Jiangsu Provincial Key Laboratory of Radiation Medicine and Protection and the Priority Academic Program Development of Jiangsu Higher Education Institutions are acknowledged.

语种：英文

外文关键词：U(VI); Magnetic graphene oxide; Amidoxime; EXAFS; Modeling

外文摘要：The highly efficient enrichment of amidoxime/magnetic graphene oxide (AO/mGO) for U(VI) was elucidated by batch, EXAFS and modeling techniques. The characteristic results indicated that AO groups were successfully grafted to surface of mGO by plasma-grafting method. The batch experiments showed that AO/mGO composites presented the high enrichment performance (approximate 435, 55, 69, 43, 108 and 32 mg/g for U(VI), Th(IV), Eu(III), Sr(II), Pb(II) and Cs(I), respectively) and rapid adsorption rate (adsorption equilibrium within 30 min). The maximum enrichment capacity of AO/mGO composites for U(VI) from seawater of south China sea was 2.85 mg/g, indicating the potential for capturing U(VI) from seawater. The EXAFS analysis indicated that highly effective enrichment of AO/mGO composites for U(VI) was attributed to inner-sphere surface complexation due to the occurrence of U-Fe shell even at low pH. The results of surface complexation modeling indicated that U (VI) adsorption from simulated seawater on AO/mGO can be satisfactorily simulated by two inner-sphere surface complexes such as SOUO2+ and SOUO2 (CO3)(2)(3-) species. These findings are crucial for the application of AO-based composites in the preconcentration of U(VI) from aqueous solution in environmental cleanup and the recovery of uranium from seawater.