1：Experimental Design and Method Selection

A one-step hydrothermal method was used to directly synthesize nanoflower like TiO2 on ordinary glass (OG) and modified with Pt-C3N4 nanotubes (NFs TiO2/Pt-C3N4) via electrophoretic deposition (EPD) method. The photocatalytic activity was investigated for degradation of three dyes under sunlight irradiation.

2：Sample Selection and Data Sources

Three dyes (methylene blue (MB), methyl violet (MV), and malachite green (MG)) were used for degradation studies. The properties of NFs TiO2/Pt-C3N4 NTs were characterized by SEM, FT-IR, EDS, and XRD.

3：List of Experimental Equipment and Materials

Chemicals included Melamine, Chloroplatinic acid, Titanium (IV)-isopropoxide, hydrochloric acid, deionized water, ethanol, 2-propanol, Mg(NO3)2, methylene blue, methyl violet, malachite green, and others. Apparatus included XRD, TEM, FE-SEM, EDS, FTIR, UV-vis spectrophotometry, and electrochemical workstation.

4：Experimental Procedures and Operational Workflow

The hydrothermal synthesis of TiO2 on OG, preparation of Pt-C3N4 NTs, EPD procedure for deposition of Pt-C3N4 NTs on TiO2, photocatalytic degradation procedure, and fabrication of bi-functionalized photocatalyst film were detailed.

5：Data Analysis Methods

The degradation efficiencies were calculated, and the photocatalytic kinetics were analyzed using Langmuir-Hinshelwood model. The band gap energy was evaluated using Tauc’s plot method.