1：Experimental Design and Method Selection:

The study employed a simple NaOH-assisted impregnation method to prepare Pt-Na/TiO2 catalysts. The catalytic performance was evaluated for toluene oxidation under visible light irradiation.

2：Sample Selection and Data Sources:

TiO2 (Degussa P25) and γ-Al2O3 were used as supports. The catalysts were characterized by XRD, SEM, BET, XPS, and UV-vis spectra.

3：List of Experimental Equipment and Materials:

Equipment included a Bruker D8 Advance X-ray diffractometer, ZEISS SUPRA 55 FESEM, FEI TECNAI G2 F30 TEM, ASAP 2020M+C surface area analyzer, SHIMADZU UV-2450 spectrophotometer, PHI-5000 Versaprobe II XPS, and Thermo IRIS Intrepid II ICP-OES. Materials included H2Pt(OH)6, NaOH, TiO2 P25, and γ-Al2O

4：Experimental Procedures and Operational Workflow:

Catalysts were prepared by impregnating supports with H2Pt(OH)6 and NaOH solutions, followed by drying. Catalytic activity was measured in a fixed-bed flow reactor under visible light irradiation.

5：Data Analysis Methods:

Data were analyzed using XRD, SEM, BET, XPS, and UV-vis spectra to characterize the catalysts' structures and properties.