Abstract: The present application relates to expanded graphite and exfoliated graphene oxide. More specifically, the present application relates to process for their preparation and uses thereof. The present application includes a process for preparing expanded graphite comprising: mixing graphite with H2SO4/H3PO4 to form a first mixture; adding KMnO4 to the first mixture to form a second and mixture; adding at least one Fe(III) salt to the second mixture under conditions to form a solid graphite-intercalated compound; separating the solid graphite-intercalated compound from the second mixture; and heating the solid graphite-intercalated compound under conditions to provide the expanded graphite.