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This experimental study investigated the performance of Catechol degradation by US/TiO 2 /H 2 O 2  process as an integrated advance oxidation process. In this experimental study, initial pH, dose of TiO 2 , initial concentration of Catechol, H 2 O 2  concentration and reaction time parameters optimised BBD. The results suggest that US/TiO 2 /H 2 O 2  process has a high efficiency in Catechol degradation. Optimum condition of US/TiO 2 /H 2 O 2  process is pH = 3.43, H 2 O 2  concentration = 130 mg/l, TiO 2  dose = 0.34 g/l, Catechol concentration = 12.52 mg/l and reaction time = 70.64 min. According to predicate point, the percentage of Catechol removal in this condition was 96.2 and 92.34 as a predicated and experimental percentage of Catechol removal by this process. The kinetics of reaction follows pseudo-first-order kinetic. The synergist effect of sonolysis, TiO 2  and H 2 O 2  is 2.09 fold. 70 and 63% of initial COD and TOC were removed. Presence of radical scavenger has an adverse impact on the performance of US/TiO 2 /H 2 O 2  process.

Ultrasonic-assisted H 2 O 2 /TiO 2 process in catechol degradation: kinetic, synergistic and optimisation via response surface methodology