1：Experimental Design and Method Selection:

The study involved synthesizing Fe3O4/graphene and Ag-Fe3O4/graphene composites via hydrothermal and microwave-assisted methods, followed by characterization and testing in UV-light-assisted Fenton reactions for dye degradation.

2：Sample Selection and Data Sources:

Organic dyes (MO, MB, CV, MG, CR, EY) were used as pollutants, with reagents purchased from Merck and graphene from Angstron Materials.

3：List of Experimental Equipment and Materials:

Equipment included XRD (Rigaku MiniFlex 600), EDX (LEO 420), TEM (FEI Tecnai G2 SuperTwin), XPS (PHI-5400), Raman microscope (Thermo Scientific DXR xi), BET analyzer (Quantachrome Nova 2000), VSM (Oxford type

4：2T), UV-vis spectrophotometer, and UV-C lamps. Materials included iron sulfate heptahydrate, silver nitrate, sodium hydroxide, acetic acid, sodium dodecyl sulfate, hydrogen peroxide, and various dyes. Experimental Procedures and Operational Workflow:

Catalysts were synthesized, characterized, and then used in batch photo-Fenton experiments where dye solutions were mixed with catalyst and H2O2 under UV irradiation, with samples taken at intervals for analysis.

5：Data Analysis Methods:

Dye concentration was monitored using UV-vis spectroscopy, removal efficiency calculated, and kinetics analyzed with pseudo-first-order models; characterization data were interpreted using standard techniques like Debye-Scherrer formula for crystallite size.