Chelated ferrous complex in solution can quickly absorb NO,but spent denitrification solution has a low efficiency of reduction regeneration.A Fe,Cu bimetallic composite electrode based on nickel foam was prepared for the electrochemical catalytic reduction of the absorption products Fe(Ⅱ)EDTA-NO(F-NO)and Fe(Ⅲ)EDTA.The feasibility of the electrode preparation method was verified by SEM,XPS and XRD characterizations.The electrochemical catalytic activity test showed that the reduction rate of F-NO was 72.6％and the selectivity of NH4+was 83.19％at the cathode potential of-0.5 V(vs.SCE)and pH 3～4.The Faraday efficiency of reduction of Fe3+to Fe2+can reach 76.14％at the cathode potential of-1.2 V(vs.SCE),pH 2～3.In addition,the results showed that the electrode had a good stability through a 10-h continuous operation.
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