期刊
ANALYTICAL CHEMISTRY
卷 93, 期 48, 页码 16175-16183出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.1c03982
关键词
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资金
- National Key Research and Development Program of China [2019YFD1002403]
- National Natural Science Foundation of China [22050410282, 21822407, 21974146, 22074154]
- Youth Innovation Promotion Association CAS [2021420]
- Foundation for Sci & Tech Research Project of Gansu Province [20JR10RA045, 20JR5RA573]
The study successfully prepared composite membranes with high uranium selectivity by intercalating metal-organic frameworks into graphene oxide, achieving separation of ions of different valence states. The permeability and selectivity of the membranes depend on factors such as membrane thickness, acidity of driving solution, and MOFs pore sizes.
Design and construction of a membrane that can achieve selective separation of uranium from spent fuel or seawater is a big challenge in the field of separation science. In this work, 1,3,5-benzenetricarboxylic acid (BTC) and three different nitrates (Zn/Ni/Cu) were used to prepare metal-organic frameworks (BTC-MOFs) with different pore sizes, and then, BTC-MOFs were intercalated into the interlayers of graphene oxide (GO) for preparing the composite membranes which presented selective separation of uranium with strong acid resistance. Composite membranes prepared by Zn/Ni/Cu-BTC-MOFs and GO can achieve the separation between ions of different valence states, and their permeability and selectivity depend on the membrane thickness, the acidity of driving solution, and the pore sizes of MOFs. Importantly, Cu-BTC-MOF-intercalated GO membranes can not only achieve the selective separation of Th4+ and UO22+ with a selectivity of approximate to 6 but also induce the ultra-high selectively separation of UO22+ and Ce3+ because the rejection rate of Ce3+ is about 100%. Moreover, the Zn-BTC-MOF-intercalated GO membrane shows an excellent selectivity of Th4+ and UO22+ with a selectivity of approximate to 25, and it may also achieve selective separation of uranium from seawater.
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