Research on direct red dye degradation kinetics by spraying discharge non-thermal plasma in solution

In this study, the direct red dye is degraded by a new discharge non-thermal plasma reactor. And the kinetic equation has been set up and analyzed. The result shows that the mass concentration of the direct red dye in solution decreases exponentially with the lengthening reaction time under the experimental conditions of the different initial concentrations, pH and the supplying voltages. The kinetic process of the plasma degradation of dyes is limited by the experimental conditions. Under decolorizing efficient experimental condition, the degradation process accords with the first order reaction kinetics.