1：Experimental Design and Method Selection:

A direct Z-scheme MoSe2@TNTs composite was prepared using a facile in situ hydrothermal method to enhance photocatalytic activity.

2：Sample Selection and Data Sources:

TNTs were grown on Ti wire, and MoSe2 nanosheets were synthesized with varying amounts of sodium molybdate and selenium powder.

3：List of Experimental Equipment and Materials:

Equipment includes SEM (Hitachi S4800), TEM (JEOL 3010), XRD (M21X, MAC Science Ltd), XPS (Thermo Fisher Scientific ESCALAB 250), UV-vis spectrophotometer (Hitachi U-3010), PL spectrophotometer (Hitachi F-7000), ESR spectrometer (JES FA200), electrochemical workstation (CHI660C), and xenon arc lamp (PLS-SXE300C, Beijing Trusttech Technology Co., Ltd.). Materials include Ti wire, selenium powder, hydrazine hydrate, sodium molybdate, deionized water, and various chemicals for characterization and activity measurements.

4：Experimental Procedures and Operational Workflow:

TNTs were prepared by anodization, followed by hydrothermal synthesis of MoSe2 on TNTs at 200°C for 12 hours. Characterization involved SEM, TEM, XRD, XPS, DRS, PL, ESR, photocurrent measurements, and photocatalytic degradation tests using 4-NP and Cr6+ as pollutants under xenon lamp irradiation.

5：Data Analysis Methods:

Data were analyzed using standard techniques for each instrument, including peak identification in XRD and XPS, intensity measurements in PL and UV-vis, and kinetic analysis for degradation rates.