• Removal of 2,4-D by an Fe(II)/persulfate/Electrochemical Oxidation Process
  • Young Hwan Hyun·Jiyeon Choi·Won Sik Shin*

  • School of Architectural, Civil, Environmental and Energy Engineering, Kyungpook National University, Daegu 41566, Korea

  • Fe(II)/과황산/전기화학적 산화 공정에 의한 2,4-D의 제거
  • 현영환·최지연·신원식*

  • 경북대학교 건설환경에너지공학부

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The removal of 2,4-dichlorophenoxyacetic acid (2,4-D) in aqueous solution by coupled electro-oxidation and Fe(II) activated persulfate oxidation process was investigated. The electrochemical oxidation was performed using carbon sheet electrode and persulfate using Fe(II) ion as an activator. The oxidation efficiency was investigated by varying current density (2 - 10 mA/cm2), electrolyte (Na2SO4) concentration (10 - 100 mM), persulfate concentration (5 - 20 mM), and Fe(II) concentration (10 -20 mM). The 2,4-D removal efficiency was in the order of Fe(II) activated persulfate-assisted electrochemical oxidation (Fe(II)/PS/ECO, 91%) > persulfate-electrochemical oxidation (PS/ECO, 51%) > electro-oxidation (EO, 36%). The persulfate can be activated by electron transfer in PS/ECO system, however, the addition of Fe(II) as an activator enhanced 2,4-D degradation in the Fe(II)/PS/ECO system. The 2,4-D removal efficiency was not affected by the initial pHs (3 - 9). The presence of anions (Cl- and HCO3-) inhibited the 2,4-D removal in Fe(II)/PS/ECO system due to scavenging of sulfate radical. Scavenger experiment using tert-butyl alcohol (TBA) and methanol (MeOH) confirmed that although both sulfate (SO4) and hydroxyl (OH) radicals existed in Fe(II)/PS/ECO system, hydroxyl radical (SO4) was the predominant radical.


Keywords: 2,4-D, Electrochemical oxidation, Ferrous, Herbcide, Persulfate

This Article

  • 2021; 26(1): 45-53

    Published on Feb 28, 2021

  • 10.7857/JSGE.2021.26.1.045
  • Received on Jan 22, 2021
  • Revised on Jan 26, 2021
  • Accepted on Feb 19, 2021

Correspondence to

  • Won Sik Shin
  • School of Architectural, Civil, Environmental and Energy Engineering, Kyungpook National University, Daegu 41566, Korea

  • E-mail: wshin@knu.ac.kr