CIESC Journal ›› 2023, Vol. 74 ›› Issue (5): 2207-2216.DOI: 10.11949/0438-1157.20230146

• Energy and environmental engineering • Previous Articles     Next Articles

Study on the electrochemical enhanced cobalt-based cathode to activate peroxymonosulfate

Ruikang LI1(), Yingying HE1(), Weipeng LU1, Yuanyuan WANG2, Haodong DING1, Yongming LUO1   

  1. 1.School of Chemistry and Chemical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi, China
    2.School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi, China
  • Received:2023-02-22 Revised:2023-05-06 Online:2023-06-29 Published:2023-05-05
  • Contact: Yingying HE

电化学强化钴基阴极活化过一硫酸盐的研究

李瑞康1(), 何盈盈1(), 卢维鹏1, 王园园2, 丁皓东1, 骆勇名1   

  1. 1.西安建筑科技大学化学与化工学院,陕西 西安 710055
    2.西安建筑科技大学环境与市政工程学院,陕西 西安 710055
  • 通讯作者: 何盈盈
  • 作者简介:李瑞康(1997—),女,硕士研究生,3041446231@qq.com
  • 基金资助:
    国家自然科学基金项目(52270167);陕西省自然科学基金项目(2019JM-390)

Abstract:

Co-MOF was grown by hydrothermal method on the surface of nickel foam (NF), and Co3O4@NF was prepared by heat treatment. The structure and morphology of the prepared material were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The catalyst as a cathode and peroxymonosulfate (PMS) constitute an electrochemically enhanced peroxosulfate activation system EC/ Co3O4@NF/PMS for the degradation of levofloxacin (LEV). The experimental results show that the degradation rate can reach 95.8% in 40 min, and the COD removal is 73.3% in 55 min when pH is 3.0, PMS dosage is 3.5 mmol·L-1, and current density is 4 mA·cm-2, which are significantly better than the system without applying current. The mechanism of the generation of active species in the system was studied. It shows that electric field promotes the activation of PMS to form singlet oxygen 1O2, free radicals SO4- and ·OH mainly by accelerating the Co3+—Co2+ cycle on the surface of the Co3O4@NF cathode. Therefore, both non-free radical and free radical pathways for LEV degradation are enhanced.

Key words: free radical, catalyst activation, electrochemistry, peroxymonosulfate, advanced oxidation, antibiotic degradation, singlet oxygen, levofloxacin

摘要:

在泡沫镍(NF)表面水热法生长了Co-MOF,经热处理制备了Co3O4@NF,通过扫描电镜、透射电镜、X射线衍射、X射线光电子能谱等手段对材料的形貌和结构进行了表征。将其作为阴极与过一硫酸盐(PMS)构成了电化学强化过一硫酸盐活化体系EC/Co3O4@NF/PMS,用于降解左氧氟沙星(LEV)。结果显示该体系在pH 3.0、PMS加入量3.5 mmol·L-1、电流密度4 mA·cm-2、40 min时LEV的降解率可达到95.8%,55 min时化学需氧量(COD)去除率为73.3%,显著优于没有施加电流的体系。对体系中活性物种产生机制的研究表明,电场主要通过加速Co3O4@NF阴极表面的Co3+—Co2+循环,促进了PMS活化为单线态氧1O2SO4-、·OH自由基的进程,使LEV降解的非自由基途径和自由基途径均得到了加强。

关键词: 自由基, 催化剂活化, 电化学, 过硫酸盐, 高级氧化, 抗生素降解, 单线态氧, 左氧氟沙星

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