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Zero-valent iron (ZVI) reductive dechlorination is a promising approach for the abatement of chlorinated organic pollutants in the environment. In this study, ZVI and Ni/Fe bimetal nanoparticles were synthesized and applied for the treatment of chloronitrobenzenes (CNBs) in water. The pre- and post-reaction nanoparticles samples were characterized by SEM and XRD respectively. Here we show that ZVI nanoparticles can effectively perform the selective reduction of p-CNB to p-chloroaniline (p-CAN) with a selectivity of ca. 100% in 10 min without dechlorination throughout the research. Catalytic reduction of p-CNB over Ni/Fe nanoparticles could be divided into two sequential processes: the first is the conversion of p-CNB to p-CAN, and the second is the reductive hydrodechlorination of p-CAN with aniline formation. Direct catalytic hydrodechlorination of p-CNB as a side route was also observed. Results indicate …