Synergetic degradation of 2,4-D by integrated photo- and electrochemical catalysis on a Pt doped TiO2/Ti electrode

Xie Quan, Shuo Chen, Jing Su, Jingwen Chen, Guohua Chen

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55 Citations (Scopus)

Abstract

The photoelectrochemical degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) at a Pt doped TiO2/Ti electrode was investigated. The electrode was prepared by first oxidizing the surface of a titanium sheet to form TiO2and then doping platinum in H2PtCl6solution. The degradation efficiency of 2,4-D in the solution with 51 mg/l concentration was, respectively, 16% for electrochemical process and 27% for photochemical process after 5 h reaction. It became 53% when photo- and electrochemical processes were integrated. The 10% higher 2,4-D degradation efficiency by the integrated method than the sum of the two individual processes demonstrates an obvious synergetic effect between the photo- and electrochemical catalysis. Besides, a decrease in current density was observed with reaction time. The degradation efficiency increased with the increase of potential bias. The degradation of 2,4-D was also dependent on pH and concentration of sodium sulfate acting as a supporting electrolyte.
Original languageEnglish
Pages (from-to)73-79
Number of pages7
JournalSeparation and Purification Technology
Volume34
Issue number1-3
DOIs
Publication statusPublished - 1 Jan 2004
Externally publishedYes

Keywords

  • Adsorption
  • Bias potential
  • Current density
  • Photoelectrocatalysis

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

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