1：Experimental Design and Method Selection:

The study used hydrothermal synthesis to prepare nanorod silver vanadate and composite materials with g-C3N4. Photocatalytic degradation experiments were conducted under visible light irradiation using a xenon lamp. Characterization methods included XRD, SEM, TEM, XPS, BET, UV-Vis diffuse reflectance spectroscopy, and GC-MS for intermediate analysis.

2：Photocatalytic degradation experiments were conducted under visible light irradiation using a xenon lamp. Characterization methods included XRD, SEM, TEM, XPS, BET, UV-Vis diffuse reflectance spectroscopy, and GC-MS for intermediate analysis. Sample Selection and Data Sources:

2. Sample Selection and Data Sources: Samples included AgVO3, g-C3N4, and Ag-AgVO3/g-C3N4 composites. Tetracycline was used as the antibiotic pollutant, purchased from Bellingwerk, Beijing Technology Co., Ltd. with 97% purity. Data were collected from laboratory experiments and instrument analyses.

3：List of Experimental Equipment and Materials:

Equipment included magnetic mixer, multi-purpose vacuum pump for circulating water, constant temperature drying box (GZX-9240MBE), ultrasonic cleaner (KQ_400KDE), 300W xenon lamp (Beijing Pofley Co., Ltd.), 752N ultraviolet-visible spectrophotometer, XRD (ULTIMA IV-285E, Rigaku), UV-Vis diffuse reflectance spectroscopy (U3010, Hitachi), FE-SEM (MERLIN, Germany), XPS (ESCALAB 250Xi, Thermo Science), UV-Vis spectrophotometer (UV-5200, Shanghai metash), specific surface area analyzer (ASAP2020). Materials included silver nitrate, ammonium metavanadate, graphite-like carbon nitride, distilled water, and tetracycline.

4：0). Materials included silver nitrate, ammonium metavanadate, graphite-like carbon nitride, distilled water, and tetracycline. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: AgVO3 was synthesized by dissolving AgNO3 and NH4VO3 in distilled water, stirring magnetically for 4h, filtering, washing, and drying at 80°C. Composite preparation involved ultrasonicating g-C3N4 in water, adding AgNO3 and NH4VO3, stirring for 4h, filtering, washing, and drying. Photocatalytic degradation involved adding tetracycline and catalyst to a beaker, ultrasonicating, stirring in dark and under visible light, sampling at intervals, and measuring absorbance with a spectrophotometer.

5：Data Analysis Methods:

Data were analyzed using pseudo-first-order kinetic equation ln(C/C0) = kt for degradation rates. Instrument data (XRD, SEM, TEM, XPS, BET, UV-Vis) were interpreted to determine structure, morphology, composition, surface area, and optical properties. GC-MS was used to identify degradation intermediates.