Figure 1.
FT-IR spectra of (a) Fe3O4, (b) Fe3O4@SiO2, (c) Fe3O4@SiO2-GPTMS, (d) Fe3O4@SiO2-GPTMS@EDA, (e) Fe3O4@SiO2-GPTMS/Schiff base, and (f) Fe3O4@SiO2-GPTMS/Schiff base-Cu(II).
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