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The accelerating research interest in graphene involving the use of Hummers method has generated non‐negligible amount of wastewater containing residual graphite as well as Mn2+. In this paper, we report the first example of using this wastewater as precursor to prepare Mn3O4/N‐doped graphite (NG) composites through a facile solvothermal process. The mass fraction of Mn3O4 in the composites was manipulated...
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