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(A) TGA spectrum of (a) Fe3O4@SiO2–NH2, (b) Fe3O4@SiO2–TCT, (c) Fe3O4@SiO2–TCT–NH2, and (d) Fe3O4@SiO2–EDTA–Ni(II) NPs; (B) magnetic hysteresis loops of (a) Fe3O4 and (b) Fe3O4@SiO2–EDTA–Ni(II) NPs; (C) good dispersity and easy separation of the catalyst by an external magnetic field.
