An in situ diffuse reflectance FTIR investigation of photocatalytic degradation of 4-chlorophenol on a TiO2 powder surface

Ulick Stafford*, Kimberly A. Gray, Prashnat V. Kamat, Arvind Varma

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

151 Scopus citations

Abstract

An in situ FTIR technique has been employed to probe the adsorption and photocatalytic degradation of 4-chlorophenol (4-CP) on TiO2 particles in a gas/solid system. The chemisorbed 4-CP adsorbed on the TiO2 surface corresponds to a monolayer. The reaction has been followed under a number of conditions in order to investigate the roles of oxygen and water in the mechanism of 4-CP degradation. The rate of 4-CP disappearance was greatest under an oxygen atmosphere saturated with water and with UV irradiation. Under these conditions hydroquinone (HQ) was observed as a primary reaction intermediate and carbonates as the final product. Transformation of 4-CP to HQ was seen to occur under a variety of reaction conditions (i.e. O2/UV, N2/H2O/UV), but HQ degradation took place only in the presence of oxygen and UV irradiation. These results illustrate that the interactions of 4-CP at the semiconductor surface are complex and suggest that oxygen is intrinsically involved in the degradation reactions.

Original languageEnglish (US)
Pages (from-to)55-61
Number of pages7
JournalChemical Physics Letters
Volume205
Issue number1
DOIs
StatePublished - Apr 2 1993

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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