1：Experimental Design and Method Selection:

The ternary nanocomposite was prepared using a polyacrylamide gel route for CaTiO3 and NiFe2O4 nanoparticles, followed by a hydrothermal method for assembly onto reduced graphene oxide (rGO). Photocatalytic activity was evaluated by degrading methylene blue (MB) and rhodamine B (RhB) under simulated sunlight irradiation. Characterization techniques included XRD, SEM, TEM, FTIR, UV-vis, XPS, BET, PL, VSM, photocurrent response, and EIS.

2：Sample Selection and Data Sources:

CaTiO3 and NiFe2O4 nanoparticles were synthesized from chemical precursors (e.g., Ca(NO3)2·4H2O, Ti(OC4H9)4, Ni(NO3)2·6H2O, Fe(NO3)3·9H2O). Graphene oxide was used as the starting material for rGO. Dye solutions (MB and RhB) were prepared with initial concentrations of 5 mg·L?1.

3：List of Experimental Equipment and Materials:

Equipment included a 200 W xenon lamp (PLS-SXE 300, Beijing Perfectlight Technology Co. Ltd.), UV-vis spectrophotometer (TU-1901, Beijing Purkinje General Instrument Co. Ltd.), electrochemical workstation (CHI 660E, Shanghai Chenhua Instrument Co. Ltd.), XRD (D8 Advance, Bruker AXS), SEM (JSM-6701F, JEOL Ltd.), TEM (JEM-1200EX, JEOL Ltd.), FTIR spectrometer (IFS 66v/S, Bruker), VSM (Lake Shore 7410), XPS (PHI-5702, Physical Electronics), BET analyzer (ASAP 2020, Micromeritics Instrument Corporation), and fluorescence spectrophotometer (Shimadzu RF-6000). Materials included chemicals like tartaric acid, glucose, acrylamide, ethanol, and dyes.

4：0). Materials included chemicals like tartaric acid, glucose, acrylamide, ethanol, and dyes. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: For nanocomposite preparation, CaTiO3 and NiFe2O4 nanoparticles were synthesized via polyacrylamide gel route (dissolving precursors, adjusting pH, heating, drying, calcining). Then, graphene oxide was dispersed in ethanol aqueous solution, mixed with nanoparticles, and hydrothermally treated at 130°C for 3 h. The product was collected by centrifugation, washed, and dried. Photocatalytic tests involved adding photocatalyst to dye solution, stirring in dark for adsorption-desorption equilibrium, irradiating with simulated sunlight, sampling at intervals, centrifuging, and measuring dye concentration via UV-vis absorbance. Recycling tests used magnetic separation, washing, and re-dispersion in fresh dye solution.

5：Data Analysis Methods:

Photocatalytic degradation percentage was calculated as (C0 - Ct)/C0 × 100%. Kinetic analysis used first-order equation ln(C0/Ct) = kappt. EIS data were fitted with an equivalent circuit model using ZSimDemo software. Bandgap energies were estimated from UV-vis spectra using first derivative curves.