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Here we report on the chemical reactivity of graphene supported Ni nanoparticles, prepared by an one-step bottom-up chemical strategy in the presence of graphene nanosheets obtained by physical exfoliation of graphite. We have found that graphene/Ni nanoparticles are active for chlordane removal through a two-step mechanism, involving chlordane degradation by Ni nanoparticles supported on graphene and subsequent adsorption of the degraded products by the graphene surface.