Photocatalytic oxidation kinetics of waste water with TNT and organic dyes

The performance and kinetics of decomposition of TNT and organic dyes in industrial waste water in circulating slurry photocatalytic reactors by employing the photocatalytic oxidation is investigated. Based on the formation and diffusion of hydroxyl radicals, and their reaction with organic dyes or TNT molecules, the kinetics model for photocatalytic oxidation of TNT and organic dye is established. The results show that organic dyes and TNT can be effectively decomposed by the photocatalytic oxidation. Removal percentage of TNT with different initial concentrations can reach above 90% at 6 hours. The results for kinetics of the photocatalytic oxidation of TNT with different initial concentrations and different organic dyes show that the photocatalytic degradation rate follows pseudo-first order kinetic model. The photocatalytic oxidation of TNT and organic dyes can also be described by the kinetics model proposed.