The photocatalyic degradation and modeling of 2,4-Dichlorophenoxyacetic acid by bismuth tungstate/peroxide

Carina Chun Pei, Wei Chu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)

Abstract

The photodegradation of herbicide 2,4-Dichlorophenoxyacetic acid (2,4-D) by bismuth tungstate with or without hydrogen peroxide by visible light was investigated. The photocatalytical reactions were studied under various conditions including the examination of the effects of initial pH, 2,4-D concentrations, light intensities, and hydrogen peroxide. Photocatalytic reactions were optimized at pH 5, higher or lower pH levels will reduce the decay rate due to the phase change of 2,4-D molecules and/or bismuth tungstate. The increase of catalyst/[2,4-D] ratio and light intensity were found to improve the 2,4-D decay rates, due to the increment of number of active sites and electron-holes on the Bi2WO6surface, respectively. The involvement of H2O2in the Bi2WO6photocatalytic process can effectively double the 2,4-D decay rate, however, this was observed within a narrow gap of H2O2dosages and easily overdosed, a precise control of H2O2dosing is critical for a successful application. Kinetic models were derived successfully, so that the process performance is predictable by incorporating initial pH level, 2,4-D concentration, light intensities, and hydrogen peroxide.
Original languageEnglish
Pages (from-to)665-669
Number of pages5
JournalChemical Engineering Journal
Volume223
DOIs
Publication statusPublished - 1 May 2013

Keywords

  • 2,4-Dichlorophenoxyacetic acid
  • Bismuth tungstate
  • Hydrogen peroxide
  • Visible light

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)
  • Industrial and Manufacturing Engineering
  • Environmental Chemistry

Cite this