Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 300, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2021.122236
Keywords
Uranium removal; alpha-FeOOH; Ferrous; Magnetism; Adsorption
Funding
- Scientific Research Fund of Hunan Provincial Education Department [19B497, 19A417]
- Science and Technology Program of Hengyang City [2019yj011166]
- National Science Foundation of China [51874180, 51704169]
- Hunan Province Engineering Research Center of Radioactive Control Technology in Uranium Mining and Metallurgy & Hunan Province Engineering Technology Research Center of Uranium Tailings Treatment Technology [2019YKZX1010]
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In this study, a promising material for uranium capture, M-alpha-FeOOH, was prepared and demonstrated to have a substantially better uranium adsorption performance compared to alpha-FeOOH. The adsorption data fit well with the quasi-second order kinetic model and the Langmuir isothermal adsorption model. The increased uranium removal performance of M-alpha-FeOOH was attributed to its higher specific surface area, better dispersion, and larger quantity of activated adsorption sites.
A large amount of uranium-containing wastewater is produced by the nuclear industry, which causes harm to human health and the environment. Goethite (alpha-FeOOH) is highly insoluble in water and has a net positive surface charge, making it an effective sorbent for metal-anion complexes in aqueous solutions. In this study, goethite (alpha-FeOOH) and Fe2+-modified magnetic goethite (M-alpha-FeOOH) were prepared using an easy one-pot chemical precipitation method and used to remove uranium from solution. The adsorbents were characterized using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), BET surface area analysis, fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and vibrating sample magnetometry (VSM). When Fe2+ partially substitutes for Fe3+, the material is magnetic, has a larger specific surface area and can be rapidly separated in a magnetic field. The uranium adsorption performance of M-alpha-FeOOH was substantially better than that of alpha-FeOOH, and its maximum adsorption capacity increased by 46.09%. The data fitted well with the quasi-second order kinetic model and the Langmuir isothermal adsorption model. According to the results of this study, the increase in the uranium removal performance of M-alpha-FeOOH was attributed to its higher specific surface area, better dispersion, and larger quantity of activated adsorption sites. These results, along with its low-cost, environmentally friendly, and facile synthesis, reveal M-alpha-FeOOH is a promising material for uranium capture.
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