1：Experimental Design and Method Selection:

Central composite design of response surface methodology was used to optimize the photocatalytic degradation conditions. The quadratic model was suggested for color removal (Y1) and COD removal (Y2).

2：2). Sample Selection and Data Sources:

2. Sample Selection and Data Sources: Golden yellow dye was provided by Dyeing Unit of Vardhman Spinning and General Mills, Ludhiana. PTD was procured from Evonik, Germany.

3：List of Experimental Equipment and Materials:

PTD, GY dye, H2O2, KMnO4, Na2C2O4, NaOH, NaCl, NaNO3, Na2CO3, Na2SO4, HCl, UV chamber with Philips UV lamps, magnetic stirrer with hot plate, Shimadzu 2450 UV Spectrophotometer, Vario photometer, Tintometer GmbH (Germany), Shimadzu TOC-L analyzer, Solar Light Co., USA intensionmeter PMA

4：Experimental Procedures and Operational Workflow:

21 Photocatalysis experiments were performed using 200 mL dye solution in double distilled water at PTD loading, initial GY dye concentration, and UV intensity corresponding to particular experimental run. The photocatalysis was done after adsorption of GY dye on PTD in dark for 60 min.

5：Data Analysis Methods:

Design Expert software was used for analysis and optimization. The photodegradation kinetics, TOC disappearance, effect of inorganic salts, and H2O2 concentration on GY dye photodegradation were studied.