Sonochemical Degradation Of Organic Pollutants In Aqueous Solution

The method of ultrasonic and Fe0 for the treatment of the degradation of reactive dark blue M-2GE and direct blue 5B in aqueous solution were studied in this paper. The effects of operationg parameters such as Fe0 quantity, the ultrasonic power, medium pH and the concentration of the dye were investigated. The results showed that the kinitics of the dyes were the first-order reaction law. It was found that the degradation rate of the dyes were obviously increased with increasing the Fe0 quantity. The mechanism of the dyes by ultrasound/ zero-valent iron process were derived and demonstration.Under the experimental condition, the results were showed that the degradation of organic pollutants by ultrasonic irradiation was obviously enhanced by adding Fe0. It was also found that the degradation of decoloration of organic pollutants in aqueous solution were decreased with increasing the initial concentration of the dye and increased with decreasing initial pH of the solution. It was also found that the ultrasonic power had influence to the degradation of organic pollutants and 400W is the best in the same experimental condition. The process of degradation reactive dark blue M-2GE and direct blue 5B was observed by the UV-Vis spectrogram.The synergy method of ultrasonic cavitation and Fe0 degraded nitrochlorobenzene in aqueous solution was also introcued in this paper. Under the experimental condition, the effects of ultrasonic power, iron dosage and initial pH on nitrochlorobenzene degradation efficiency were inspected, and the degradation kinetics law was discussed. The degradation of distinct conforms to first-order reaction law. The results show that synergetic effect of the ultrasonic cavitation and Fe0 is significant. The decomposition efficiency of nitrochlorobenzene increases with the increase of ultrasonic power and iron dosage. The effect of initial pH on nitrochlorobenzene decomposition is not obviously. The process of degradation nitrochlorobenzene was analyzed by the GC-MS spectrogram.