SEM images of (a) GO, (b) SGO, (c) Fe3O4 (left),
SMGO, (right), and (d) MGO at different magnifications. XRD patterns
of (e) pristine graphite powder, GO, SGO, MGO, and SMGO. Schematic
representations of the synthesis of (f) MGO, (g) SGO, and (h) SMGO.