Abstract
Ozonation is a promising technology for the treatment of biorefractory compounds. Parabens belong to a chemical family of apparently innocuous preservatives that have been used in the food and cosmetic industries for several years. Oxidation of different parabens, such as methylparaben (MP), ethylparaben (EP), propylparaben (PP), and butylparaben (BP), was carried out using O3 in ultrapure water. A design of experiments procedure has been carried out in order to optimize the ozonation process as well as to study the interaction between the studied variables: pH and temperature (T). In addition to the application of the single ozonation, ozone-combined processes were studied under the optimal conditions obtained for O3 (namely, pH 8 and T = 20 °C). The tested processes were O3/Fenton, O3/H2O2, O3/UV, O3/UV/H2O2, O3/photo-Fenton, O3/UV/TiO2, and O3/UV/TiO2/H2O2. According to the experimental results, single ozonation is a more effective treatment than O3/H2O2 and O3/Fenton processes. In addition, the introd...
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