Degradation of 2,4-Dichlorophenol Catalyzed by Ultrasound-Assisted Laccase

TB559%X703.1; Laccase possesses a good degradation effect on organic pollutants,but it is too long to achieve the desired effect.In order to improve the treatment effect of laccase on degradation of organic pollutants,2,4-dichlorophenol (2,4-DCP) was selected as a treatment target in the study.This study investigated a new technique for catalyzing the degradation of 2,4-DCP,that is,ultrasound-assisted laccase catalysis.The optimal experimental parameters such as pH,ultrasonic power,duty eycle and laccase concentration were determined under optimized experimental conditions.The results showed that the optimum conditions for degradation of 2,4-DCP were that pH =5.5,the input power was 105 W,the duty cycle was 50％ and the laccase concentration was 0.4 U/mL.The degradation rate of 2,4-DCP reached 77.5％ under the optimum conditions at 4 h.When in ultrasonic environment,the enzymatic activity of laccase could be stimulated and improved.Compared with conventional methods,this technique significantly promoted the degradation rate of 2,4-DCP while reduced action time.Furthermore,no new pollutant was introduced into the degradation process.Therefore,ultrasound-assisted laccase catalysis is an environmentally friendly technique to degrade pollutants.