Abstract
Bisphenol A is an endocrine disruptor. Complete mineralization of bisphenol A is therefore a primary environmental issue. Here, the combination of ozonation and photocatalysis by TiO2 is proposed for the degradation and final mineralization of bisphenol A. TiO2 films deposited onto two sides of an Al lamina show good stability and high surface roughness. We used a specific experimental setup employing two facing ultraviolet lamps and TiO2 layers, together with an ozone flux. High-performance liquid chromatography–mass spectrometry determinations on bisphenol A solutions sampled at different reaction times and Fourier Transform Infrared analyses of the oxide at the end of the reaction were performed to study the reaction intermediates and the overall degradation mechanism. Our results show that pollutant mineralization achieved with the combined method is far higher, of 55% in the case of 0.3 mM bisphenol A, than those obtained by individual treatments such as photolysis (<3%), ozonation (6%), photocatalysis (6%), and by other combined processes: photolytic ozonation (13%) and catalytic ozonation (15%). This finding is explained by the occurrence of highly synergistic effects.
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Acknowledgments
This research has been supported by the University of Milan Research Funds (FIRST, PUR). The authors wish to thank Prof R. Annunziata for fruitful discussions, Dr. M. De Matteo (CISI) and Dr. F. Milanesi (MIUR FIRB contract number: RBIN064YAT) for HPLC–MS analyses.
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Colombo, A., Cappelletti, G., Ardizzone, S. et al. Bisphenol A endocrine disruptor complete degradation using TiO2 photocatalysis with ozone. Environ Chem Lett 10, 55–60 (2012). https://doi.org/10.1007/s10311-011-0328-0
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DOI: https://doi.org/10.1007/s10311-011-0328-0