Photocatalytically-assisted electrooxidation of herbicide fenuron using a new bifunctional electrode PbO2/SnO2-Sb2O3/Ti//Ti/TiO2

Chemosphere. 2018 Jul:203:1-10. doi: 10.1016/j.chemosphere.2018.03.126. Epub 2018 Mar 20.


The degradation of the herbicide fenuron was investigated using a new porous bifunctional electrode where the electrooxidation takes place on one side and the photocatalysis on the other side. The characterization of the synthetized bifunctional electrode (PbO2/SnO2-Sb2O3/Ti//Ti/TiO2) was performed by scanning electron microscopy, energy dispersive X-ray spectrometry and X-ray diffraction analysis and showed that the anodic side (Ti/SnO2-Sb2O3/PbO2) is covered with a tetragonal β-PbO2 film and that the photocatalytic side (Ti/TiO2) consists of an anatase phase of TiO2. The single application of electrooxidation achieved 87.8% fenuron degradation and 84.1% chemical oxygen demand (COD) removal while heterogeneous photocatalysis resulted in only 59.2% and 39.7% fenuron concentration decay and COD removal, respectively. On the other hand, the photocatalytically-assisted electrooxidation (photo-electrooxidation) performed on the bifunctional electrode provided higher performances of fenuron degradation (97.5%) and mineralization (97.4%). Investigation of operating parameters highlighted the positive effect of increase in current density. Conversely, an increase in fenuron concentration led to a decrease in degradation rate and COD removal. It was also found that the COD removal and mineralization efficiency are higher in a neutral medium.

Keywords: Bifunctional electrode; Electrooxidation; Fenuron; Lead dioxide anode; Photo-electrooxidation.

MeSH terms

  • Antimony / chemistry*
  • Catalysis
  • Electrodes*
  • Electrolysis
  • Herbicides / chemistry
  • Lead / chemistry*
  • Oxidation-Reduction
  • Oxides / chemistry*
  • Phenylurea Compounds / chemistry*
  • Photochemical Processes*
  • Tin Compounds / chemistry*
  • Titanium / chemistry*


  • Herbicides
  • Oxides
  • Phenylurea Compounds
  • Tin Compounds
  • titanium dioxide
  • Lead
  • lead oxide
  • Antimony
  • Titanium
  • stannic oxide
  • fenuron
  • antimony trioxide