工业水处理 ›› 2022, Vol. 42 ›› Issue (10): 84-90. doi: 10.19965/j.cnki.iwt.2021-1294

• 试验研究 • 上一篇    下一篇

Co3O4-钛基纳米电极去除工业废水中硝酸盐的研究

聂华芳1,2(), 杨庆峰1(), 刘登科1,2, 刘阳桥3   

  1. 1. 中国科学院上海高等研究院绿色化学工程技术研究与发展中心, 上海 201210
    2. 中国科学院大学, 北京 100049
    3. 中国科学院上海硅酸盐研究所, 上海 200050
  • 收稿日期:2022-07-13 出版日期:2022-10-20 发布日期:2022-11-02
  • 作者简介:

    聂华芳(1997— ),硕士。E-mail:

    杨庆峰,研究员,博士生导师。E-mail:

  • 基金资助:
    国家自然科学基金项目(61574148)

Co3O4-titanium-based nanoelectrode for nitrate removal from industrial wastewater

Huafang NIE1,2(), Qingfeng YANG1(), Dengke LIU1,2, Yangqiao LIU3   

  1. 1. Green Chemical Engineering Technology Research and Development Center,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China
    2. University of Chinese Academy of Sciences,Beijing 100049,China
    3. Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China
  • Received:2022-07-13 Online:2022-10-20 Published:2022-11-02

摘要:

工业废水中过量的硝酸盐(NO3 -)可导致严重的环境污染和人类健康问题,通过电化学还原法去除工业废水中的NO3 -具有重要意义。采用阳极氧化和溶胶-凝胶两步法制备了Co3O4-钛基纳米电极(Co3O4-TNE),并研究了其电化学还原NO3 -的性能。结果表明,Co3O4的负载有利于暴露更多的反应活性位点,Co3O4-TNE电极比TNE表现出更强的电化学活性和更高的NO3 --N去除率。电流密度的增加有利于提高NO3 --N去除率,Cl-浓度的增加有利于降低NH4 +-N生成率且对NO3 --N去除率几乎无影响。在NO3 --N初始质量浓度为50 mg/L、电流密度为10 mA/cm2、Cl-初始质量浓度为750 mg/L的条件下,电解120 min后,NO3 --N去除率为95.3%,且体系中最终无NH4 +-N生成。自由基清除实验表明,体系中原子H*的产生有利于NO3 -的还原,电子转移引起的直接还原和原子H*引起的间接还原共同实现了NO3 -的高效去除。Co3O4-TNE电极在5次循环实验后仍表现出良好的稳定性和极低的金属Co浸出量,在实际废水处理中具有应用潜力。

关键词: 四氧化三钴, 钛基纳米电极, 硝酸盐, 电化学, 工业废水

Abstract:

Excessive nitrate in industrial wastewater can cause serious environmental pollution and human health issues. It is significant to remove nitrate from industrial wastewater by electrochemical reduction. Co3O4-titanium-based nanoelectrode(Co3O4-TNE) was prepared in two steps by anodic oxidation and sol-gel methods,and its electrochemical nitrate reduction performance was investigated. Experimental results indicated that the modification of Co3O4 facilitated the exposure of more reactive sites and Co3O4-TNE exhibited stronger electrochemical activity and higher NO3 --N removal rate than TNE. The increase of current density was conducive to improving the NO3 --N removal rate,and the increase of Cl- concentration was beneficial to reduce the NH4 +-N generation rate with almost no effect on NO3 --N removal rate. 95.3% NO3 --N removal rate and no NH4 +-N were finally obtained after 120 min of electrolysis with initial NO3 --N mass concentration of 50 mg/L,current density of 10 mA/cm2 and initial Cl- mass concentration of 750 mg/L. The radical scavenging experiments showed that the generation of atomic H* in the system promoted nitrate reduction. The efficient removal of nitrate was realized by direct reduction caused by electron transfer and indirect reduction caused by atomic H*. Furthermore,Co3O4-TNE represented excellent stability and extremely low metal Co leaching after five cycles and had potential application in practical wastewater treatment.

Key words: Co3O4, titanium-based nanoelectrode, nitrate, electrochemistry, industrial wastewater

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