The oxidation capacity of Mn3O4 nanoparticles is signiﬁcantly enhanced by anchoring them onto reduced graphene oxide to facilitate regeneration of surface-associated Mn(III) /Lin Duan a , Zhongyuan Wang a , Yan Hou a , Zepeng Wang a , Guandao Gao a , Wei Chen a, ** , Pedro J.J. Alvarez b, * - Duan,Lin