1：Experimental Design and Method Selection:

The study employed a hydrothermal method to synthesize titanate nanosheets (TNS) and titanate nanotubes (TNT) from TiO2 P25, followed by photodeposition to fabricate Pt-doped TNMs (Pt

2：5-TNS and Pt5-TNT). Photocatalytic performance was evaluated under UV irradiation using a batch photoreactor, with adsorption studies conducted in the dark to isolate adsorption effects. Sample Selection and Data Sources:

Four model dyes (methylene blue, rhodamine B, methyl orange, naphthol blue black) with different charges and structures were used, sourced from Sigma-Aldrich. Single and binary dye solutions were prepared.

3：List of Experimental Equipment and Materials:

Key equipment included a transmission electron microscope (TEM, JEOL JEM1230), X-ray diffractometer (Bruker D2 PHASER), FT-IR spectrophotometer (Bruker Tensor 27), XPS spectrometer (Fison VG ESCA210), UV-visible spectrophotometer (Jasco V650), zeta potential analyzer (Zetasizer Nano-ZS), pH meter (Horiba F-23), BET surface area analyzer (Micromeritics ASAP2020), photoluminescence spectrometer (Jasco FP-8200), UV lamp (HL100CH-5, Sen Lights Co.), and TOC analyzer (Teledyne Tekmar). Materials included TiO2 P25, H2PtCl6, NaOH, and dyes from Sigma-Aldrich.

4：Experimental Procedures and Operational Workflow:

TNMs were synthesized by hydrothermal treatment of TiO2 P25 in NaOH at 130°C for 3 h (TNS) or 24 h (TNT), followed by washing and drying. Pt-doped TNMs were prepared by photodeposition in ethanol with H2PtCl6 under UV light. Adsorption tests involved adding catalysts to dye solutions in the dark, sampling at intervals, and measuring concentrations. Photocatalysis experiments involved irradiating dye-catalyst suspensions with UV light after adsorption equilibrium, with samples taken periodically for analysis.

5：Data Analysis Methods:

Adsorption data were fitted to Langmuir and Freundlich isotherms. Photocatalytic degradation kinetics were analyzed using a pseudo-first-order model. Dye concentrations in mixtures were determined by first-derivative spectrometry. Mineralization was assessed via TOC analysis.