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The process of electrochemical nitrate reduction behaving the merits of sufficient efficacy and environmental benignity has attracted immense interest for the nitrate (NO3-) disposal. However, the practical application of this technique is seriously restricted due to the defects of generating by-products (such as ammonium and nitrite), and the presence of total nitrogen (TN) with a high concentration. In this work, a novel catalyst composite (Fe0/Ni2P/CC) was fabricated via the combined method involving liquid-phase reduction, electroless nickel-phosphorus plating and phosphation processes. The crystal structure, morphology, and chemical component of the obtained composite were characterized. The influences of operating parameters (pH value, current density, initial nitrate-N concentration and coexisting substances) on the NO3- reduction were assessed. At the optimized conditions, the synthesized Fe0/Ni2P/CC composite displays the fascinating performances in NO3- conversion (89.81%), N2 selectivity (95.55%) and tested endurance, comparing with other three samples (i.e. Fe0 +Ni2P/CC, pure HER and pure Fe0). For the disposal for simulated effluent of municipal wastewater treatment plant effluent, this composite exhibits a superb NO3- conversion of 89.81%, and the concentration of TN (1.92 mg L−1) is lower than the threshold limit (2 mg L−1) of five-level standard for surface water of China. It is noteworthy that the Fe0/Ni2P/CC composite has an excellent durability ( |
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