A B S T R A C TThe combination of H 2 O 2 and hydrodynamic cavitation has been used to degrade phenol in water. The effects of parameters including inlet pressure (P1), orifice geometries of hydrodynamic reactor, initial concentration of H 2 O 2 , the presence of dissolved gases and catalysts (CuO, Fe, and TiO 2 ) have been discussed. It revealed that increased P1, more number of holes on plates, optimum initial H 2 O 2 concentration, the higher flow rate of oxygen, and the presence of Fe or CuO are more favorable in phenol degradation. Nitrogen has different effect on cavitation from oxygen. Furthermore, the identification of primary intermediates of the reaction (hydroquinone, catechol, benzoquinone, and resorcin) indicated that hydroxyl radicals are involved in phenol degradation mechanisms.
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