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Effect of Supporting Electrolyte on the Surface Corrosion and Anodic Oxidation Performance of Graphite Electrode

  • Kai Zhu
  • Xiaoli Ren
  • Xiuping Sun
  • Lijing Zhu
  • Zhirong SunEmail author
Original Research
  • 32 Downloads

Abstract

This study presents a comparative investigation of supporting electrolyte effect on the surface corrosion and anodic oxidation performance of graphite electrode. The effect of electrolyte on the electrochemical behavior is investigated in solution containing 0.05 mol L−1 sodium salt, using current-overpotential curves and Tafel lines. The surface morphology and composition of the graphite anodes before and after electrolysis are characterized by scanning electron microscopy, X-ray diffraction, and Raman spectra. In aqueous solution, graphite anode is positive polarized, functionalizes the surface, and releases soluble organics. The light-absorbing corrosion products of graphite anode are recorded by a UV-Vis spectrophotometer in the ultraviolet wavelength range. Batch experiments on atrazine oxidation show that NaCl is more efficient than Na2SO4 and NaNO3 to promote the combustion of organics due to the mediated oxidation of the electrogenerated active chlorine species. The oxidation process is confirmed to employ a non-radical mechanism in which the organics are degraded at the active sites of graphite anode.

Graphical Abstract

Carbon anodes have been widely employed for organics removal during anodic oxidation process, however, oxidation of contaminants with these materials is usually accompanied by electro-corrosion. This paper presents a comparative investigation of supporting electrolyte effect on the surface corrosion and anodic oxidation performance, using graphite felt as the example, to extend our knowledge of the mechanistic behavior of carbon anodes.

Keywords

Graphite anodes Electrolytes Surface corrosion Anodic oxidation 

Notes

Funding Information

This work was supported by National Natural Science Foundation of China (51778013 and 51478014) and Cultivation Fund for Beijing New Century Hundred Thousand and Ten Thousand Talents Project.

Compliance with Ethical Standards

Competing Interests

The authors declare no competing financial interest.

Supplementary material

12678_2019_541_MOESM1_ESM.docx (230 kb)
ESM 1 (DOCX 229 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Kai Zhu
    • 1
  • Xiaoli Ren
    • 1
  • Xiuping Sun
    • 1
  • Lijing Zhu
    • 1
  • Zhirong Sun
    • 1
    Email author
  1. 1.National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse TechnologyBeijing University of TechnologyBeijingPeople’s Republic of China

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