experimental investigation of ultrasound/ fenton’s reagent oxidation process on the degradation rate constant of p nitrophenol

The main objective of the present work is the investigation of the efficacy of a combination of fenton chemistry and highfrequency sonochemistry for wastewater treatment, including pnitrophenol (pnp) as a model pollutant. these methods have been used to degrade pnp in a batch system under different operating conditions based on ultrasound process, fenton reaction, ultrasound/hydrogen peroxide, and ultrasound/fenton process. the reactor consisted of six ultrasonic transducers with a frequency of 1.7 mhz. three transducers were located in the bottom, and the other three were embedded in the wall of the reactor. the results showed that the pnp decomposition follows a pseudofirstorder reaction. the degradation rate constant was determined for various operating parameters including ph, input electric power to transducers, and concentrations and volumes of h2o2 and feso4. in optimum conditions, the highest pnp degradation rate constant was obtained for the combination of 1.7 mhz ultrasound and fenton reaction (0.166 min1 ) with a synergistic coefficient of 1.165. next priorities were related to fenton, ultrasound/hydrogen peroxide and ultrasound with degradation rate constant of 0.137, 0.0107, and 0.005 min1, respectively. therefore, the ultrasound/fenton process had the highest ability to degrade pnp, because ultrasound could intensify fenton reaction to produce more hydroxyl radicals.

Experimental investigation of ultrasound/ Fenton’s reagent oxidation process on the degradation rate constant of p nitrophenol

The main objective of the present work is the investigation of the efficacy of a combination of Fenton chemistry and highfrequency sonochemistry for wastewater treatment, including pnitrophenol (PNP) as a model pollutant. These methods have been used to degrade PNP in a batch system under different operating conditions based on ultrasound process, Fenton reaction, ultrasound/hydrogen peroxide, and ultrasound/Fenton process. The reactor consisted of six ultrasonic transducers with a frequency of 1.7 MHz. Three transducers were located in the bottom, and the other three were embedded in the wall of the reactor. The results showed that the PNP decomposition follows a pseudofirstorder reaction. The degradation rate constant was determined for various operating parameters including pH, input electric power to transducers, and concentrations and volumes of H2O2 and FeSO4. In optimum conditions, the highest PNP degradation rate constant was obtained for the combination of 1.7 MHz ultrasound and Fenton reaction (0.166 min1 ) with a synergistic coefficient of 1.165. Next priorities were related to Fenton, ultrasound/hydrogen peroxide and ultrasound with degradation rate constant of 0.137, 0.0107, and 0.005 min1, respectively. Therefore, the ultrasound/Fenton process had the highest ability to degrade PNP, because ultrasound could intensify Fenton reaction to produce more hydroxyl radicals.