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

被引:60
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
关键词
U(VI); Magnetic graphene oxide; Amidoxime; EXAFS; Modeling; METAL-ORGANIC FRAMEWORK; RAY-ABSORPTION SPECTROSCOPY; SURFACE COMPLEXATION MODEL; THEORETICAL CALCULATIONS; URANIUM EXTRACTION; IRON NANOPARTICLES; BACILLUS-SUBTILIS; AQUEOUS-SOLUTIONS; ZEROVALENT IRON; COMBINED BATCH;
D O I
10.1016/j.cej.2018.09.140
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
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.
引用
收藏
页码:66 / 74
页数:9
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