期刊
MICROCHIMICA ACTA
卷 185, 期 10, 页码 -出版社
SPRINGER WIEN
DOI: 10.1007/s00604-018-2991-3
关键词
Solid-phase extraction; Metal-organic framework (MOF); Hybridmaterial; MOF-polymer composite; Modification of MOFs; Nanoporous materials; Uranium(VI) adsorption; Preconcentration; Environmental remediation; Spectrophotometry
资金
- University of Zabol, Zabol, Iran
An amino-functionalized zirconium metal-organic framework was composed with a 3D urea-based porous organic polymer to give a hybrid material termed UiO-66-NH2/urea-POP. The material was characterized by Fouriertransform infrared spectroscopy, powder X-ray diffraction, scanning electron microscopy, and Brunauer-Emmett-Teller surface area measurements. It is shown to be a viable sorbent for solid-phase extraction of uranium from water samples. Parameters such as the pH value of the sample, amount of adsorbent, type and volume of eluent, adsorption and desorption time, and sample volume were optimized. Uranyl ion was quantified by using UV-vis spectrophotometry by using 1-(2-pyridyl-azo)-2-naphthol as the indicator. Figures of merits include (a) a maximum sorption capacity of 278mgg(-1); (b) a detection limit of 0.6gL(-1); and (c) intra-day and inter-day precisions (for n=5 at a concentration of 100gL(-1)) of 4.8 and 1.9%, respectively. The sorbent can be recycled, and no significant change was observed in the capacity and repeatability of the sorbent after seven extractions. The high surface area, metal-binding sites, and stability of the sorbent makes it a most viable tool for efficient and fast extraction and removal of uranium.
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