Research progress on identification methods and degradation mechanism of dye degradation products

Advanced oxidation processes (AOPs) are commonly applied for dyes degradation. However, some transformation products from the degradation processes have been proved to possess higher toxicity than the parent compounds, which have mutagenesis, carcinogenesis and teratogenesis effects. In addition, the uncertainty, low residual concentration and unavailability in capturing of dye degradation products have increased the difficulties of this research filed, which has became the hot topic in environmental chemistry and textile science. This paper summarized the recent research in the application of AOPs for dye degradation and the analysis and identification methods (GC-MS and LC-MS) for degradation products. Furthermore, detailed degradation pathways, reaction mechanisms of AOPs and possible degradation products for the important dye were discussed as well. Finally, future research about identification methods and degradation mechanism of dyes were proposed.