Abstract:

The degradation efficiency, influencing factors and kinetics of SF Blue dye in UV/H2O2 system were investigated. The results show that UV/H2O2 has a high activity on the dye degradation. The degradation ratio at 60 min is 98% for the system containing 0.5 mL 5% H2O2 in 150 mL 100 mg/L dye solution. The photodecomposition reaction of the dye is accompanied with photooxidative degradation. The results also show that the photooxidative degradation of the dye in UV/H2O2 system is a firstorder reaction with an activation energy of 5.17 kJ/mol and a pre-exponential factor of 0.168 min-1 the photodecomposition of the dye in UV system is also a first-order reaction with an activation energy of 16.9 kJ/mol and a pre-exponential factor of 1.04 min-1. In addition, the best degradation efficiency of the dye could be achieved under a strong alkaline condition with initial pH of the dye solution around 12.

Key words: hydrogen peroxide, photodegradation, SF Blue, reaction rate constant, activation energy