The boosted adsorption of uranium(VI) on phosphorylated Fe3O4@MnO2@UiO-66-(OH)2
Keda Zhu1, Maoning Xu1, Quanqi Yang1
1College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, China.
Abstract:
In this study, a phosphorylated Fe3O4@MnO2@UiO-66-(OH)2 magnetic nanocomposite (FMU-P) was synthesized by a hydrothermal method and post-synthetic modification. The characterization results indicated that the adsorption performance of FMU-P could be maintained at a high level under acidic and alkaline conditions. Compared to Fe3O4@MnO2@UiO-66 (FMU), the higher adsorption capacity of FMU-P for U(VI) (697.78 vs. 367.16 mg g-1 at pH 6.0, 298.15 K) was mainly due to the stronger inner-sphere surface complexation with various phosphoryl functional groups (e.g., P-O, PO groups). According to XPS analysis, chemisorption and electrostatic interactions play an important role in U(VI) adsorption. The almost unchanged adsorption capability (>90% after five consecutive cycles) proved the excellent reusability of FMU-P. Moreover, a magnetic test indicated that adsorbed materials can be separated under an applied magnetic field, enabling the use of FMU-P across diverse environments. These findings suggest the potential of FMU-P in treating uranium-containing wastewater due to its high adsorption capacity, excellent chemical stability and simple magnetic separation.
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