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Photo- and sonocatalytic decay of caffeine (C0 = 5 mg L−1) and its oxidation byproducts by 30-min sonolysis and photolysis of the compound in the presence of 0.1 g L−1 TiO2 at pH 4. The solid lines are the fit of Eq. (9) to the data, with estimated reaction rate constants of 0.19 and 0. 0.05 min−1 for UV/TiO2 and US/TiO2, respectively.
