Study on Degradation of RB5 Dye by Pulse Discharge

摘要

With constantly updated dyeing processes,a large number of chemical dyes with complex molecular structures are used in the printing and dyeing industries,which makes it difncult to degrade dyes in dyeing wastewater through the conventional water treatment process.The reactive black(RB5) dye was the object of study,using strong oxidizing free radicals generated from pulsed discharge to degrade dye wastewater.Reaction time,initial concentration and the gas flow efrect the degradation of RB5 were investigated.The results showed that all the greatest absorbance values decreased with time increasing.and after about 90 min the dye wastewater became colorless;extemal power in the same circumstances,to high concentrations of dye degradation rate was relatively low;the free radicals increased for oxygen flow rate increased. which caused the degradation rate of RB5 to increase,but the gas flow rate should not be too large;the various active substances generated from pulse discharge easily damaged the molecule chain of dye chromophoric group,which made it discoloring.