Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 375, Issue -, Pages 320-329Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2019.05.005
Keywords
Nano-sized architectural; Graphene oxide; Amidoxime functionalized; Uranium adsorption
Categories
Funding
- National Natural Science Foundation of China [NSFC 51872057]
- Aplication Technology Research and Development Plan of Heilongjiang Province [GX16A009]
- Fundamental Research Funds of the Central University [HEUCFZ]
- Natural Science Foundation of Heilongjiang Province [QC2018010]
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The introduction of organic groups onto graphene oxide (GO) platelets can supply additional active sites for adsorption of uranium(VI) (U(VI)) to improve the adsorption capacity. However, as a result of the existence of stabilizing pi-conjugation system, a facile and effective modification method remains a challenge. Therefore, a novel strategy is exploited by nano-sized architectural design of multi-activity GO through post-decoration with amidoxime functionalized diaminomaleonitrile (DM-AO). The post-modification of DM-AO successfully activated the inert sites in GO platelets. Meanwhile, the amidoxime group in DM-AO can improve the adsorption selectivity. Adsorption amount of U(VI) on the as prepared GO-DM-AO reached at 935 mg g(-1), which is increased by 209% increment compared with that of pristine GO at the same concentration. The adsorption efficiency of GO-DM-AO is greatly improved, and the time to reach the adsorption equilibrium is half of that of GO. Excitingly, the excellent removal efficiency could still maintained even after 5 cycles of adsorption-desorption. The outstanding adsorption amount, short adsorption equilibrium time, and excellent removal efficiency can provide a theoretical guidance for further immobilization of U(VI) from seawater.
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