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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.
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页码:66 / 74
页数:9
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