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多孔Fe-Si电极电催化还原硝酸根离子

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苏诚, 施翼杰, 伍廉奎, 姚建英, 李军, 姚志强, 曹华珍, 郑国渠. 多孔Fe-Si电极电催化还原硝酸根离子[J]. 环境工程学报, 2019, 13(2): 319-326. doi: 10.12030/j.cjee.201809046
引用本文: 苏诚, 施翼杰, 伍廉奎, 姚建英, 李军, 姚志强, 曹华珍, 郑国渠. 多孔Fe-Si电极电催化还原硝酸根离子[J]. 环境工程学报, 2019, 13(2): 319-326. doi: 10.12030/j.cjee.201809046
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SU Cheng, SHI Yijie, WU Liankui, YAO Jianying, LI Jun, YAO Zhiqiang, CAO Huazhen, ZHENG Guoqu. Electrocatalytic reduction of nitrate ions by porous Fe-Si electrode[J]. Chinese Journal of Environmental Engineering, 2019, 13(2): 319-326. doi: 10.12030/j.cjee.201809046
Citation: SU Cheng, SHI Yijie, WU Liankui, YAO Jianying, LI Jun, YAO Zhiqiang, CAO Huazhen, ZHENG Guoqu. Electrocatalytic reduction of nitrate ions by porous Fe-Si electrode[J]. Chinese Journal of Environmental Engineering, 2019, 13(2): 319-326. doi: 10.12030/j.cjee.201809046
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多孔Fe-Si电极电催化还原硝酸根离子

  • 1.

    浙江工业大学材料科学与工程学院，杭州 310014

  • 2.

    浙江久立特材科技股份有限公司，湖州 313028

  • 基金项目:

Electrocatalytic reduction of nitrate ions by porous Fe-Si electrode

  • 1.

    College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China

  • 2.

    Zhejiang Jiuli Hi-Tech Metals Co.Ltd., Huzhou 313028, China

  • Fund Project:

  • 摘要: 水体硝酸盐污染已成为一个日益严重的问题。以多孔Fe和Fe-Si合金为阴极，Ti/IrO2为阳极构建电解系统，对模拟废水(100 mg·L-1NO3--N + 500 mg·L-1 NaCl + 500 mg·L-1 Na2SO4)进行电解以去除其中的硝酸根离子，并研究了多孔Fe-Si合金在电解过程中的稳定性。实验结果表明，增大电流密度有利于提高NO3--N和总氮的去除效率。当电流密度为40 mA·cm-2时，以多孔Fe为阴极，几乎无副产物产生，NO3--N和总氮去除率均为94.3%，但电解完成之后Fe电极腐蚀严重，溶液中铁离子浓度达1 418 mg·L-1。而以多孔Fe-Si为阴极时，随合金中硅含量增加，NO3--N和总氮去除率均呈下降趋势，但电极稳定性显著提高，电解完成之后溶液中Fe离子浓度显著下降。当Fe-Si合金中硅原子百分比为50%时，NO3--N和总氮去除率均为78.8%，此时溶液中Fe离子浓度仅为41 mg·L-1。多孔Fe-Si合金作为阴极还原硝酸根离子时，具有较高的硝酸根去除率和良好的稳定性，应用前景较好。
    Abstract: Nitrate pollution in water hacorresponding author:s become a more and more serious problem. An electrolysis system with porous Fe and Fe-Si alloy cathodes and Ti/IrO2 anode was built to remove nitrate from a synthetic wastewater containing 100 mg·L-1NO3--N, 500 mg·L-1 NaCl and 500 mg·L-1 Na2SO4. The stability of the porous electrode was also studied. Results showed that the increase of current density favored the increase of the NO3--N and total nitrogen (TN) removal efficiencies. When porous Fe was used as the cathode, the NO3--N and TN removal efficiencies were 94.3% and no by-products were produced at electric current density of 40 mA·cm-2. However, a serious corrosion happened on the porous Fe after electrolysis, and the concentration of Fe ions in the solution reached 1 418 mg·L-1. When porous Fe-Si alloy was used as the cathode, the NO3--N and TN removal efficiencies decreased with the increase of silicon content in the porous Fe-Si alloy. However, the stability of the electrode was dramatically enhanced, and the concentration of Fe ions in the solution significantly decreased after electrolysis. Specifically, the NO3--N and TN removal efficiencies were 78.8% when silicon content in the porous Fe-Si alloy was 50%. At the same time, the concentration of Fe ions in the solution was only 41 mg·L-1. The high nitrate removal efficiency and good stability for porous Fe-Si alloy cathode show a promising prospect for its use in nitrate reduction.
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  • 刊出日期:  2019-02-02

多孔Fe-Si电极电催化还原硝酸根离子

  • 1. 浙江工业大学材料科学与工程学院，杭州 310014
  • 2. 浙江久立特材科技股份有限公司，湖州 313028
基金项目:

摘要: 水体硝酸盐污染已成为一个日益严重的问题。以多孔Fe和Fe-Si合金为阴极，Ti/IrO2为阳极构建电解系统，对模拟废水(100 mg·L-1NO3--N + 500 mg·L-1 NaCl + 500 mg·L-1 Na2SO4)进行电解以去除其中的硝酸根离子，并研究了多孔Fe-Si合金在电解过程中的稳定性。实验结果表明，增大电流密度有利于提高NO3--N和总氮的去除效率。当电流密度为40 mA·cm-2时，以多孔Fe为阴极，几乎无副产物产生，NO3--N和总氮去除率均为94.3%，但电解完成之后Fe电极腐蚀严重，溶液中铁离子浓度达1 418 mg·L-1。而以多孔Fe-Si为阴极时，随合金中硅含量增加，NO3--N和总氮去除率均呈下降趋势，但电极稳定性显著提高，电解完成之后溶液中Fe离子浓度显著下降。当Fe-Si合金中硅原子百分比为50%时，NO3--N和总氮去除率均为78.8%，此时溶液中Fe离子浓度仅为41 mg·L-1。多孔Fe-Si合金作为阴极还原硝酸根离子时，具有较高的硝酸根去除率和良好的稳定性，应用前景较好。

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