TiO 2 -Based Heterogeneous Photocatalytic Water Treatment Combined with Ozonation

Authors: Ilisz, István; Bokros, Attila; Dombi, András

Source: Ozone: Science and Engineering, Volume 26, Number 6, December 2004 , pp. 585-594(10)

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Abstract:

The degradations of aliphatic carboxylic acids (formic acid, acetic acid, and propionic acid) were investigated by a combination of TiO 2 -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.

Keywords: Ozone; Heterogeneous Photocatalysis; Photocatalysis; Advanced Oxidation; Titanium Dioxide; Carboxylic Acids

Document Type: Research article

DOI: http://dx.doi.org/10.1080/01919510490885406

Affiliations: 1: Department of Inorganic and Analytical Chemistry, University of Szeged, Szeged, Hungary

Publication date: 2004-12-01