Photocatalytic degradation of phenol and m-nitrophenol using irradiated TiO2 in aqueous solutions

Chwei Huann Chiou, Cheng Ying Wu, Ruey Shin Juang*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

106 Scopus citations


Photocatalytic degradation of single and binary phenol and m-nitrophenol (m-NP) in aqueous solutions by commercial TiO2 powders (Degussa P-25) under UV irradiation was examined. The influences of various operating parameters including the initial reactant concentration (0.13-0.71 mM), solution pH (4.1-12.7), and the presence of the second reactant on photodegradation were studied. The effect of TiO2 pre-wetting with aqueous solution on phenol photodegradation was also studied. It was shown that the degradation rates of phenol and m-NP decreased with increasing initial reactant concentrations. The optimal solution pH for the photodegradation of single phenol and m-NP was at around 7.4 and 8.9, respectively. Compared to the single systems, the photodegradation rates of phenol and m-NP in binary systems decreased, particularly when the second reactant was in excess. Moreover, the photodegradation of either single or binary reactants in aqueous solutions satisfactorily followed the pseudo-first-order kinetics.

Original languageEnglish
Pages (from-to)559-564
Number of pages6
JournalSeparation and Purification Technology
Issue number3
StatePublished - 22 09 2008
Externally publishedYes


  • Binary systems
  • Phenol
  • Photodegradation
  • Titanium dioxide
  • UV irradiation
  • m-Nitrophenol


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