Azo dyes are widely used in printing and dyeing industry. Our colorful clothes are stained by such dyes.
About 10% to 15% of the azo dyes are discharged with sewage without proper treatment. Some of the azo dyes and their metabolic intermediates are hard to be degraded. New efficient approach of azo dye wastewater is urgent to solve the problem.
Ozone is used to oxidize the azo bond. However, ozone production consumes lots of electricity, meanwhile it requires complicated and pricy equipments. Also it needs complicated and pricy equipments.