TiO2-based heterogeneous photocatalytic water treatment combined with ozonation

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Abstract

The degradations of aliphatic carboxylic acids (formic acid, acetic acid, and propionic acid) were investigated by a combination of TiO2-based photocatalysis and ozonation at pH = 2. The carboxylic acids were analyzed by high-performance liquid chromatography (HPLC), while the mineralization process was characterized by measuring the dissolved organic carbon (DOC) content. The efficiency of heterogeneous photocatalysis combined with ozonation was compared with that of ozonation and that of heterogeneous photocatalysis alone. In all cases, the combined system proved most effective in the oxidation of carboxylic acids. The degradation of carboxylic acids was accompanied by a continuous decrease in the DOC content, and aldehydes and carboxylic acids containing one carbon atom less than the starting material were formed as intermediates.

Original languageEnglish
Pages (from-to)585-594
Number of pages10
JournalOzone: Science and Engineering
Volume26
Issue number6
DOIs
Publication statusPublished - Dec 1 2004

Keywords

  • Advanced Oxidation
  • Carboxylic Acids
  • Heterogeneous Photocatalysis
  • Ozone
  • Photocatalysis
  • Titanium Dioxide

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry

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