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The magnetic Fe 3 O 4 @C@TiO 2 microspheres with multilevel yolk–shell structure were successfully prepared by combining sol–gel and simple hydrothermal methods. The features of the as‐obtained Fe 3 O 4 @C@TiO 2 microspheres were investigated by Fourier transform infrared (FTIR) spectra, scanning electron microscopy (SEM), powder X‐ray diffraction (XRD), N 2 adsorption–desorption measurements and transmission electron microscopy (TEM). Fe 3 O 4 @C@TiO 2 was used as an adsorbent to explore its adsorption properties of oxytetracycline hydrochloride (OTC‐HCl) by changing initial concentration and time. The results suggest that the maximum adsorption of Fe 3 O 4 @C@TiO 2 is 87.3 mg·g −1 , and the time reaching the absorption equilibrium is 60 min. Langmuir model fits to data better than the Freundlich model, and the kinetic properties are well described by the pseudo‐second‐order model. In addition, the synthesized composites’ reusability without obvious deterioration in performance is demonstrated by three cycles.
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Hu et al. (2017) studied this question.
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