Developing easily separable materials for efficient treatment of low-concentration phosphate which causes eutrophication of water bodies are full of challenges. A magnetic CuFe2O4/MIL-101(Fe) composite composed of hollow spheres CuFe2O4 and octahedrons MIL-101(Fe) was first fabricated via a facile solvothermal approach. CuFe2O4/MIL-101(Fe) (1.0 g·L−1) exhibited above 88.4% adsorption efficiency for low-concentration phosphate (5.0 mg·L−1) removal, over a wide pH ranging 2–12 at 293 K. Phosphate adsorption was a spontaneous endothermic process, in good association with Langmuir and pseudo-second-order kinetic model. The XPS and FT-IR analysis elucidated that electrostatic interaction and coordination exchange were main mechanisms. In addition, after four cycles, CuFe2O4/MIL-101(Fe) displayed 75.0% adsorption of phosphate, by treatment with external magnetic field separated and 0.1 mol·L–1 NaOH desorbed. Therefore, CuFe2O4/MIL-101(Fe) exhibited high selectivity and recycling for removing phosphate from wastewater.
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This work was supported by the National Natural Science Foundation of China [grant numbers 51478095, 41772236, and 51978133]. The Fundamental Research Funds for the Central Universities of China [grant number 2412018ZD016, 2412019FZ021, and 2412019QD009]. Finally, the authors acknowledge Rachel Benham who works in writing center of Northeast Normal University for polishing the language.
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Liu, Q., Lin, S., Khan, S. et al. Rapid removal and mechanism investigation of low-concentration phosphate from wastewater by CuFe2O4/MIL-101(Fe) composite. J Nanostruct Chem (2021). https://doi.org/10.1007/s40097-021-00406-9