Degradation kinetics of cuprophenyl yellow RL by UV/H2O2/ultrasonication (US) process in aqueous solution

Experiments were conducted to study the kinetic aspects of the UV/H2O2/US treatment process for Cuprophenyl Yellow RL. It was found that the reduction in absorbance of the dye solution followed the pseudo-first-order kinetic model at different pH and hydrogen peroxide dosages. The rate constants at different pH as well as hydrogen peroxide dosages were obtained. The TOC removal for the treatment process with different hydrogen peroxide dosages followed different kinetic patterns and it was inferred that they would follow different degradation pathways. When lower H2O2 dosage was used, there were intermediates produced, while the dye might be directly mineralized when higher H2O2 dosage was adopted.