Electrochemical degradation and mineralization of glyphosate herbicide

ABSTRACT

The presence of herbicide is a concern for both human and ecological health. Glyphosate is occasionally detected as water contaminants in agriculture areas where the herbicide is used extensively. The removal of glyphosate in synthetic solution using advanced oxidation process is a possible approach for remediation of contaminated waters. The ability of electrochemical oxidation for the degradation and mineralization of glyphosate herbicide was investigated using Ti/PbO₂ anode. The current intensity, treatment time, initial concentration and pH of solution are the influent parameters on the degradation efficiency. An experimental design methodology was applied to determine the optimal condition (in terms of cost/effectiveness) based on response surface methodology. Glyphosate concentration (C₀ = 16.9 mg L⁻¹) decreased up to 0.6 mg L⁻¹ when the optimal conditions were imposed (current intensity of 4.77 A and treatment time of 173 min). The removal efficiencies of glyphosate and total organic carbon were 95 ± 16% and 90.31%, respectively. This work demonstrates that electrochemical oxidation is a promising process for degradation and mineralization of glyphosate.

KEYWORDS:

• Glyphosate
• herbicide
• electrochemical
• degradation
• mineralization

Acknowledgements

Sincere thanks are extended to Dr Viet Hoang Nguyen, Institute of Environmental Technology, VAST for the laboratory facilities and technical support to this study.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by Mitacs [grant no. IT06082].