The sensitized photocatalysis of azo dyes in a solid system: a feasibility study

Melissa S. Dieckmann*, Kimberly A. Gray, Richard G. Zepp

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

The degradation of 4-hydroxyazobenzene and Solvent Red 1 on various oxide particles (SiO2, Al2O3 and TiO2) was monitored using diffuse reflectance spectroscopy. Adsorption of the dye onto the support material can facilitate photolytic degradation by affecting its bonding. Analysis of the absorption spectra throughout the degradation process indicates that the C1bN bond in these azo dyes is the site for oxidative attack. The dependence of degradation rate on surface coverage indicates that direct interaction between the dye molecule and the TiO2 particles is necessary for sensitized photocatalysis to be an effective method of degradation.

Original languageEnglish (US)
Pages (from-to)1021-1034
Number of pages14
JournalChemosphere
Volume28
Issue number5
DOIs
StatePublished - Mar 1994

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

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