改性Cu-Pd双金属电极电化学还原硝酸盐性能研究

王畅; 刘吉明; 王永恒; 逯新宇

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中国环境科学 ›› 2023, Vol. 43 ›› Issue (10) : 5196-5207.

水污染与控制

改性Cu-Pd双金属电极电化学还原硝酸盐性能研究

王畅, 刘吉明, 王永恒, 逯新宇

作者信息 +

Study on the electrochemical reduction of nitrate using a modified Cu-Pd bimetallic electrode

WANG Chang, LIU Ji-ming, WANG Yong-heng, LU Xin-yu

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文章历史 +

摘要

为揭示高盐废水中电催化还原硝酸盐氮的能力，采用阴极电沉积法成功制备了NF/CNTs/Cu-Pd双金属复合电极.通过SEM-EDS、XRD和XPS表征，证实CuPd纳米颗粒成功沉积在泡沫镍（NF）底板上.研究了电流密度、初始pH值、初始硝酸盐浓度和Cl^-浓度等因素对模拟水中NO₃^--N、TN的去除能力的影响，并用实际高盐废水验证了其可行性.结果表明：没有Cl^-存在情况下，NF/CNTs/Cu-Pd可有效去除NO₃^--N，但TN去除能力一般，NO₃^--N主要转化为NH₄⁺-N.有Cl^-存在作用下，NO₃^--N、TN得到有效去除.反应最佳条件为：电流密度30mA/cm²，初始pH值7，初始浓度50mg/L，氯离子浓度2.0g/L，此时NO₃^--N、TN去除率分别达到100%和97.2%.实际废水中溶解性有机物（DOM）会抑制NO₃^--N去除.DOM去除后，NO₃^--N去除率为95.5%，TN去除率达到85.6%.

Abstract

A NF/CNTs/Cu-Pd bimetallic composite electrode was effectively synthesized using the cathodic electrodeposition technique. The objective was to achieve efficient electrocatalytic reduction of nitrate in wastewater. SEM-EDS, XRD, and XPS analysis confirmed the successful deposition of Cu-Pd nanoparticles onto the nickel foam (NF) substrate. The efficacy of NO₃^--N and TN removal in simulated water was investigated by manipulating various factors, including current density, initial pH value, initial nitrate concentration, and Cl^- concentration. The approach was also applied to actual saline wastewater to validate its feasibility. The results showed that NF/CNTs/Cu-Pd exhibited effective NO₃^--N removal capabilities without Cl^-, while TN removal efficiency was relatively modest, with NO₃^--N primarily converted into NH₄⁺-N. However, in the presence of Cl^-, both NO₃^--N and TN were efficiently removed. The optimal reaction conditions were determined to be a current density of 30mA/cm², an initial pH value of 7, an initial concentration of 50mg/L, and a chloride ion concentration of 2.0g/L. Under optimal conditions, the removal efficiencies of NO₃^--N and TN reached 100% and 97.2%, respectively. The presence of dissolved organic matter (DOM) in actual wastewater could impede NO₃^--N removal. After removing the DOM, the removal efficiency of NO₃^--N decreased to 95.5%, and the TN removal efficiency declined to 85.6%.

导出引用

王畅, 刘吉明, 王永恒, 逯新宇. 改性Cu-Pd双金属电极电化学还原硝酸盐性能研究[J]. 中国环境科学. 2023, 43(10): 5196-5207

WANG Chang, LIU Ji-ming, WANG Yong-heng, LU Xin-yu. Study on the electrochemical reduction of nitrate using a modified Cu-Pd bimetallic electrode[J]. China Environmental Science. 2023, 43(10): 5196-5207

中图分类号： X703.1

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