The use of oxyhalogen in photocatalytic reaction to remove o-chloroaniline in TiO2 dispersion

W. K. Choy, Wei Chu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

34 Citations (Scopus)


Photodecay of o-chloroaniline (o-ClA) in various combinations of UV sources, TiO2, and oxyhalogens was investigated. To improve the conventional photocatalytic process by using UV/TiO2, the addition of oxyhalogens (ClO3-, BrO3-and IO3-) into UV/TiO2system was studied and the effect in such addition is very encouraging for all the selected additives. Oxyhalogens are capable of deferring the electron-hole recombination of TiO2which significantly improved its catalytic performance. The presence of IO3-in UV/TiO2resulted in the fastest o-ClA decay among three oxhalogens at the same dosage. The decay of o-ClA in UV/TiO2/oxyhalogen process is characterized by a two-stage pseudo-kinetics, where a faster initial decay was followed by a retardation state. A mathematics model was successfully established for the prediction of the two-stage decay of o-ClA in UV / TiO2/ IO3-with any designed [IO3-] concentration.
Original languageEnglish
Pages (from-to)2106-2113
Number of pages8
Issue number11
Publication statusPublished - 1 Feb 2007


  • Mineralization
  • o-Chloroaniline
  • Oxyhalogens
  • Photodecay
  • Radicals
  • TiO 2

ASJC Scopus subject areas

  • Environmental Chemistry
  • General Environmental Science


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