The effect of operational parameters on the photoinduced decoloration of dyes using a hybrid catalyst V2O5/TiO2

M. A. Rauf, S. B. Bukallah, Amena Hamadi, Azwa Sulaiman, Fatima Hammadi

Research output: Contribution to journalArticlepeer-review

82 Citations (Scopus)

Abstract

The decoloration of three dyes namely Toludine Blue, Safranin Orange and Crystal Violet was studied in the presence of UV radiation using a heterogeneous hybrid catalyst, namely titanium oxide impregnated with vanadium oxide. The advantage of using a hybrid catalyst lies in the fact that the decoloration increased by more than five times as compared to in a neat catalyst. The influence of operational parameters, such as dye concentration, amount of catalyst and pH of the solution were thus determined for dye decoloration using a hybrid catalyst. Rate of photoinduced catalytic decoloration was calculated from the observed absorption changes and the induced effects were explained on a mechanistic model involving the generation of {radical dot}OH radicals which are responsible for the decoloration of dye solution. The kinetic data fitted well to pseudo first order equation and the Langmuir-Hinshelwood model. Dye decoloration was also investigated in the presence of some ions and their role was discussed in terms of chemical reactions.

Original languageEnglish
Pages (from-to)167-172
Number of pages6
JournalChemical Engineering Journal
Volume129
Issue number1-3
DOIs
Publication statusPublished - May 1 2007

Keywords

  • Dyes
  • Langmuir-Hinshelwood
  • Photocatalysis
  • Titanium oxide
  • Vanadium oxide

ASJC Scopus subject areas

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

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