Ultrasonic degradation of reactive brilliant red K-2BP in water with CCl4 enhancement: Performance optimization and degradation mechanism

The ultrasonic degradation of reactive brilliant red K-2BP (K-2BP) in water with CCl4 enhancement was investigated. The effects of operating parameters, such as CCl4 dosage, ultrasonic power, media temperature, dye initial concentration, and initial media pH on K-2BP degradation were discussed. The ultrasonic degradation of K-2BP was obviously enhanced by CCl4 addition – an effect attributed to the increased OH radical concentration in the presence of CCl4 as a hydrogen atom scavenger, and the formation of chlorine-containing radicals. The main degradation products of K-2BP were tentatively identified by GC–MS and ion chromatography. A possible degradation pathway for K-2BP was also proposed.

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► The ultrasonic degradation of K-2BP was remarkably enhanced by CCl4 addition.
► The enhancement is attributed to the increased OH radical and the formation of chlorine-containing radicals in the solution.
► The effects of operating parameters on the K-2BP degradation were investigated.
► The main degradation products of K-2BP were tentatively identified by GC–MS and ion chromatography.