期刊
ENVIRONMENTAL SCIENCE-NANO
卷 9, 期 3, 页码 1168-1179出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1en01046h
关键词
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资金
- National Natural Science Foundation of China [51373044]
- Natural Science Foundation of Heilongjiang province, China [E2017018]
This study successfully fabricated oxime-modified hierarchical self-assembly polyimide microspheres composed of polyimide nanosheets for uranium adsorption from aqueous solution. The adsorption performance of the microspheres was excellent, with a high removal percentage in low uranium concentration wastewater.
The oxime-modified hierarchical self-assembly polyimide microspheres (HSPI-O) composed of polyimide nanosheets have been fabricated successfully by a solvothermal method to adsorb uranium from aqueous solution, of which the maximum adsorption capacity reaches 415 mg g(-1) (pH = 6). More importantly, the removal percentage of uranium in simulated uranium-containing wastewater with low uranium concentration (200-1000 mu g L-1) can exceed 97%, and the residual uranium concentration can satisfy the emission standard. Different from many powdery adsorbents that have been reported, the diameter of HSPI-O is relatively large (about 25 mu m), and there are a large number of open spaces (about 150 nm) between the nanosheets, which are conducive to the passage of uranium-containing solution in a fixed-bed column. In addition, an eluent with a high uranium concentration is achieved with a rapid desorption process, which is conducive to the recovery of uranium. Adsorption thermodynamics and kinetic parameters reflect its adsorption is a spontaneous exothermic chemical adsorption process. The adsorption performance has almost no difference after 5 cycles, indicating a good recyclability. In summary, HSPI-O exhibits a great application potential in the fields of nuclear fuel partition and uranium-bearing wastewater remediation.
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