以泡沫镍为基底的Fe、Cu双金属复合电极对亚铁络合脱硝液的还原性能探究  

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

作　　者：梁越 丁静 童华[1] LIANG Yue;DING Jing;TONG Hua(College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学化学工程学院,北京100029

出　　处：《环境工程学报》2024年第5期1395-1405,共11页Chinese Journal of Environmental Engineering

摘　　要：以EDTA为螯合剂的亚铁络合脱硝液能够快速吸收NO,但其面临着还原再生效率低下的问题。针对吸收产物Fe(Ⅱ)EDTA-NO(F-NO)和Fe(Ⅲ)EDTA的阴极催化电化学还原制备了一种以泡沫镍为基底的Fe、Cu双金属复合电极,通过SEM、XPS、XRD等材料表征分析验证了此电极制备方法的可行性。电化学催化活性测试表明,还原FNO时设定阴极电位为-0.5 V(vs.SCE),pH为3~4之间,可以实现72.6%的F-NO还原率和83.19%的NH_(4)^(+)选择性;还原Fe3+时选定阴极电位为-1.2 V(vs.SCE),pH=2~3,此时还原产生Fe^(2+)的法拉第效率最高可以达到76.14%。此外,还考察了此电极连续工作10 h的还原效果,结果证明了其在实际运行中具有良好的稳定性。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 H_(4)^(+)was 83.19%at the cathode potential of-0.5 V(vs.SCE)and pH 3~4.The Faraday efficiency of reduction of Fe^(3+)to Fe^(2+)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.

关 键 词：电催化还原 复合型电极 亚铁络合脱硝液 Fe(Ⅱ)EDTA-NO Fe(Ⅲ)EDTA 

分 类 号：X511[环境科学与工程—环境工程]