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- W3120255507 abstract "An efficient uranium adsorbent, amidoximated polyacrylonitrile foam (AOPAN) with a hierarchical pore structure, was prepared by freezing-extraction followed by amidoximation. AOPAN was analyzed by Fourier transform infrared (FT-IR), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), and showed an excellent uranium adsorption performance in aqueous solutions; the uranium adsorption capacity was 1058 mg/g. Even in the presence of competing ions, AOPAN showed a high selective removal ability for uranium (removal rate > 85%). After three cycles, the adsorption capacity and removal rate for uranium were still higher than 800 mg/g and 90%, respectively, which indicated the good recyclability of AOPAN. Furthermore, the adsorption process fitted the Freundlich model and the pseudo-second-order kinetic model. The calculated ΔH° and ΔG° indicated that the adsorption process was endothermic. The higher adsorption temperature could promote the adsorption on AOPAN. The XPS analysis indicated that the chelation between the amidoxime group and uranium plays a key role in the adsorption of uranium on AOPAN. • Porous amidoxime modified PAN with hierarchical pore (AOPAN) prepared by freeze-extraction. • AOPAN shows high U(VI) sorption capacity of 1058 mg/g. • High selectivity and good recyclability. • Hierarchical pore and strong chelation play important role." @default.
- W3120255507 created "2021-01-18" @default.
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- W3120255507 date "2021-04-01" @default.
- W3120255507 modified "2023-10-13" @default.
- W3120255507 title "Efficient uranium adsorption by amidoximized porous polyacrylonitrile with hierarchical pore structure prepared by freeze-extraction" @default.
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- W3120255507 doi "https://doi.org/10.1016/j.molliq.2021.115304" @default.
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