Intensification of the degradation of Acid RED-18 using hydrodynamic cavitation

In this work degradation of Acid Red-18 (AR-18) was examined in the hydrodynamic cavitation reactor. Orifice plates with different holes geometry are used to determine the optimum plate to carry out the degradation based on cavitation number. The obtained optimum orifice plate is used as a cavitating device on varying parameters like initial AR-18 concentrations, pH, temperatures, and operating pressures of the reactor. A photocatalyst (TiO2) was prepared by the sol-gel method and used in combination with H2O2 to intensify the degradation of AR-18. The obtained optimum condition of hydrodynamic cavitation was again used in the ultrasonic cavitation reactor for the comparison. Hydrodynamic cavitation (orifice) given the highest degradation as compared to Hydrodynamic cavitation (Venturi) and Ultrasonic Cavitation with and without the use of TiO2. At TiO2(300 mg/L) dose, 88.1%, 70.4% and 64.8% degradation is obtained in HC-O, HC-V and UC reactor at initial AR-18 concentration (15 ppm), pH (3), Operating temperature (35 °C), and H2O2(300 mg/L). Hence the use of an advanced oxidation process can be successfully used with hydrodynamic cavitation to intensify the degradation of Acid Red-18 under the controlled operating parameters.

Abstract licence: CC BY-NC-ND

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