Reduction performance of Fe and Cu bimetallic composite electrode based on nickel foam for ferrous complex denitrification solution
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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