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The effect of pH on the rate of caffeine oxidation (C0 = 5 mg L−1) by 30-min sonolysis in the presence of UV-irradiation. The data referred to as “Control” belong to singly applied US at pH 4. The rate constants of the hybrid process were 0.065 min−1 and 0.051 min−1, at pH 4 and 7, respectively.
