dye degradation required some parameters to be studied for the optimization of the conditions. for example, how of dose should be considered based on the volume of the sample to be tested? and What is the best conc (in ppm) range best suited?
For the dye degradation studies use the varied pH (mostly acidic) dye solution at varied temperature with different ppm of dye solution and sample as well and compare the results to get the best one. Also follow the above recommended papers for the separation and UV spectroscopy.