1：Experimental Design and Method Selection:

The study used a chemical precipitation method at room temperature to synthesize the ternary composite. Photocatalytic activity was assessed under visible light irradiation using a 300 W Xe lamp with a cut-off filter.

2：Sample Selection and Data Sources:

Antibiotics such as tetracycline (TC), oxytetracycline hydrochloride (OTC-HCl), and levofloxacin (LVFX) were used as target pollutants. Deionized water and various wastewaters were employed.

3：List of Experimental Equipment and Materials:

Chemicals included melamine, silver nitrate, sodium carbonate, etc., from Sinopharm Chemical Reagent Co. Equipment included X-ray diffractometer (Bruker AXS D8 Advances), SEM (Hitachi S-4800), TEM (JEM-2010), FTIR spectrometer (IR Prestige-21), XPS (Thermo ESCALAB 250XI), UV–vis spectrophotometer (Cary 300), spectrofluorometer (Fluromax-4), LC-MS system (Agilent 1290 series HPLC and G6460 Triple Quadrupole mass analyzer), ESR spectrometer (Bruker ER200-SRC), electrochemical workstation (CHI760D), and UV–vis spectrophotometer for concentration measurement.

4：Experimental Procedures and Operational Workflow:

Synthesis involved mixing GO and CN with AgNO3 and Na2CO3, stirring, centrifugation, washing, and drying. Photocatalytic tests involved dispersing catalyst in pollutant solution, stirring in dark for adsorption equilibrium, irradiating with light, sampling at intervals, centrifuging, filtering, and measuring concentration.

5：Data Analysis Methods:

Data were analyzed using pseudo-first-order kinetics, XRD for crystallinity, FTIR for functional groups, TEM for morphology, XPS for elemental composition, UV–vis DRS for optical properties, PL for charge recombination, EIS and PC for electrochemical properties, 3D EEMs for fluorescence, LC-MS for intermediates, and ESR for radical detection.