Figure 3

(A) Magnetic curves of the prepared materials. (B) XRD patterns of (a) Fe₃O₄, (b) MG, (c) MG/PDA and (d) MG/PDA treated with the developed MDSPE method. (C) FT-IR spectra of the prepared materials. (D) N₂ adsorption–desorption isotherms of MG/PDA.