Cobalt manganese oxides supported graphite phase carbon nitride(CMCN)is successfully prepared by two-step calcination method.Manganese oxides exist mainly in the form of Mn3O4 and MnCO3,and cobalt oxides exist in the form of CoO.Due to the presence of g-C3N4,Mn and Co are uniformly distributed without agglomeration.It is indicated by XPS characterization that both Co and Mn have two valence states within CMCN,and the structural unit of g-C3N4 is remained in CMCN.The catalytic degradation performance of CMCN catalyst is evaluated through degradation of Rhodamine B.It is shown that under the synergistic action of Mn and Co,the degradation rate of Rhodamine B exceeds 99%in 1min.It is verified by electron paramagnetic resonance and quenching experiments that nonradical oxidation(1 O2)dominates the degradation of Rhodamine B.
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