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The degradation of 2-chlorophenol in water was kinetically investigated using the following different techniques, employed either separately or simultaneously, always with the same experimental set-up: light irradiation (315–400 nm), sonication, photocatalysis with different types of TiO₂, photocatalysis with sonication. The influence of the reaction volume and of different gas mixtures, containing Ar and O₂, as well as O₂/O₃, was also investigated. Finally, an energetic comparison among these different techniques was performed, focused on an industrial application of some of them.