Rezumat articol ediţie STUDIA UNIVERSITATIS BABEŞ-BOLYAI

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In the present study, two selected volatile organic compounds (VOCs) were exposed to UV-VIS irradiation – produced by common fluorescent tubes - under controlled humidity and different temperature conditions and their photocatalytic oxidation was quantitatively studied in the presence of TiO₂. Using the inexpensive UV-VIS light source a significant photochemical degradation of toluene and chlorobenzene was obtained. The removal of studied compounds was investigated, in the presence of two different TiO₂ catalysts (Degussa P25 TiO₂ and aerogel TiO₂), whose activity was not affected by the high humidity conditions. In all experiments the degradation rate for toluene was higher than for chlorobenzene. At 70 % relative humidity and room temperature conditions, Degussa P25 TiO₂ shows a major photodegradation effect, comparatively to aerogel TiO₂. Increasing the temperature up to 50 °C and maintaining the relative humidity at the same level, the photocatalytic degradation in the presence of the aerogel TiO₂ increase significantly, therefore the photocatalytic activities for both TiO₂ catalysts are comparable, as well in the case of toluene as for chlorobenzene.

Keywords: photocatalytic oxidation, toluene, chlorobenzene, degradation rate