Removal of 2,4-dichlorophenol from aqueous solution using ultrasonic/H2O2

The effect of ultrasound/hydrogen peroxide on the removal efficiency of 2,4-dichlorophenol (2,4-DCP) from aqueous solutions was investigated. The effects of solution pH, sonication time, H2O2 concentration, and tert-butanol (t-BuOH) concentration were also examined on process efficiency in 2,4-DCP degradation. Ultrasonic treatment at 20 kHz in combination with hydrogen peroxide resulted in increased removal efficiency of 2,4-DCE The removal efficiency was improved with increasing sonication time, and the maximum efficiency was obtained at pi I of 3. t-BuOH decreased the removal efficiency of 2,4-DCP under optimum conditions by quenching hydroxyl radicals. According to the obtained results, 74.6% chemical oxygen demand removal was achieved with US/H2O2 process after 90 min of reaction time at pH of 3 and H2O2 concentration of 0.1 mol/L. The decomposition kinetic data fitted well with the pseudo-first-order kinetic model with a rate constant of 0.025 min(-1).