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Electrocatalysis

, Volume 10, Issue 1, pp 35–44 | Cite as

Comparative Degradation of Atrazine by Anodic Oxidation at Graphite and Platinum Electrodes and Insights into Electrochemical Behavior of Graphite Anode

  • Kai Zhu
  • Xi Wang
  • Xiaoyue Ma
  • Zhirong SunEmail author
  • Xiang HuEmail author
Original Research
  • 70 Downloads

Abstract

Anodic oxidation capacities of graphite and platinum (Pt) electrodes were investigated for the degradation of the herbicide atrazine in synthetic aqueous medium. The electro-oxidation of atrazine under various supporting electrolytes and applied currents was conducted in an undivided reactor with different electrode materials. The electrochemical behavior between anode material and supporting electrolyte was investigated by means of cyclic voltammetry. Graphite anode exhibited good oxidation capacity for degradation of 10 mg L−1 atrazine in near-neutral pH condition, achieving over 90% removal efficiency in all cases within 60 min. Atrazine removal efficiency of 100% was obtained with graphite anode in 60 min of reaction time at applied current 60 mA, NaCl concentration 0.05 mol L−1, and initial pH 6.8; nevertheless, less than 60% of removal was achieved with Pt anode under the same conditions. Five times consecutive runs demonstrated that the atrazine removal efficiency was obviously increased with the positive polarized graphite anode. Positive polarization of graphite anode during anodic oxidation process functionalizes the surface, generating oxygen-containing functional groups; these functional groups played a catalytic role during the oxidation of substrates. An oxidation pathway was proposed in which atrazine was virtually destroyed by chemisorbed reactive oxygen at the graphite anode.

Graphical Abstract

Anodic oxidation capacities of graphite and platinum (Pt) anodes were investigated for the degradation of atrazine. Experimental results show that graphite anode was more powerful than Pt to destroy atrazine in all cases. Oxygen-containing functional groups generated from positive polarization of graphite played catalytic roles during the oxidation process.

Keywords

Anodic oxidation Catalysis sites Electrolyte Graphite anode Oxygen-containing functional-groups 

Notes

Funding information

This work was supported by the 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

Conflict of Interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse TechnologyBeijing University of TechnologyBeijingPeople’s Republic of China
  2. 2.College of Chemical EngineeringBeijing University of Chemical TechnologyBeijingPeople’s Republic of China

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