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(a) FE-SEM picture of Fe3O4 confirms the spherical structure of Fe3O4, (b) SEM picture of Fe3O4@guanidine-Pd confirms the spherical form of Fe3O4@Guanidine-Pd, (c–e) TEM images of Fe3O4@Guanidine-Pd confirm the layer on core–shell structure of the Fe3O4 nanoparticles and the immobilized guanidine layer on the surface, (f) SAED pattern of the Fe3O4@Guanidine-Pd, and (g) EDX spectra of Fe3O4@Guanidine-Pd confirming the presence of C, O, Fe, Cu, and N.
