Phenol photodegradation over titanium dioxide

Maria Trillas, Montse Pujol, Xavier Domènech

Research output: Contribution to journalArticleResearchpeer-review

52 Citations (Scopus)

Abstract

The heterogeneous photocatalytic oxidation of phenol in aqueous diluted solutions over TiO2 particles under UV‐illumination has been investigated. It has been observed that the yield of the phenol photooxidation depends strongly on the pH of the solution. Maximum yields are obtained at pH 8 and also in very alkaline media. These results are explained considering the processes that take place at the surface of the semiconductor, in which OH radicals have an important role. With respect to the initial charge transfer steps a kinetic analysis has been performed. From this analysis it was deduced that the constant rate of formation of OH radicals is about 4.0 × 104 times greater than the constant rate of the direct reaction between phenol and photogenerated holes in the TiO2 particles. Finally, from HPLC analysis, hydroquinone, paraquinone and 1,2.4‐benzenetriol have been detected as intermediate products prior to the total phenol mineralization. Copyright © 1992 Society of Chemical Industry
Original languageEnglish
Pages (from-to)85-90
JournalJournal of Chemical Technology & Biotechnology
Volume55
Issue number1
DOIs
Publication statusPublished - 1 Jan 1992

Keywords

  • oxidation
  • phenol
  • photocatalysis
  • TiO 2

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