Efficient sonoelectrochemical decomposition of chlorpyrifos in aqueous solution

摘要

In this study, we selected the stainless-steel mesh as the electrode material, supplemented with conventional power ultrasound in the electrochemical degradation of the chlorpyrifos effluent. The effect of different operating conditions, such as voltage, initial electrolyte concentration, temperature and ultrasonic power were investigated with synthetic effluent to gain the most efficient degradation rate. The best reaction parameters were: voltage of 20 V, electrolyte concentration of 2 mg L-1, ultrasonic power of 200 W, as well as 20 degrees C, which led to 93.3% and 72.8% of degradation in US-EC and EC system. Applying higher concentrations of electrolyte (sodium sulfate) and higher voltages, the chlorpyrifos solution can be more efficiently degraded with a high synergy of 37%. The degradation of chlorpyrifos followed pseudo-first-order kinetics.