1：Experimental Design and Method Selection:

The study involved synthesizing Bi2WO6 microspheres via a hydrothermal method and AgI/Bi2WO6 heterojunctions via an in situ precipitation method to enhance photocatalytic activity under visible light. The rationale was to create a Z-scheme system for efficient charge separation.

2：Sample Selection and Data Sources:

Samples included pure Bi2WO6, pure AgI, and AgI/Bi2WO6 heterojunctions with varying AgI weight percentages (5%, 10%, 20%, 40%). Tetracycline (TC) was used as the model pollutant.

3：List of Experimental Equipment and Materials:

Materials included bismuth nitrate pentahydrate, sodium tungstate dihydrate, potassium iodide, silver nitrate, isopropyl alcohol, EDTA-2Na, benzoquinone, and TC from Chinese medicine group chemical reagent co., Ltd. Equipment included XRD (Bruker), SEM (S4800), TEM and HRTEM (Tecnai G20), XPS, BET analyzer (Micromeritics ASAP 2460), UV-vis spectrometer (Shimadzu UV-2600), TOC analyzer (Shimazu TOC-VCPH), spectrofluorimeter (F-4500), PL spectrophotometer (Perkin Elmer LS 55), electrochemical workstation (CHI760E), ESR spectrometer (Bruker ER200-SRC), and a 300 W Xe lamp (CEL-HXF300) with a 420 nm cutoff filter.

4：Experimental Procedures and Operational Workflow:

Synthesis involved hydrothermal treatment at 160°C for 20 h for Bi2WO6, followed by in situ precipitation for AgI/Bi2WO

5：Photocatalytic tests involved dispersing catalyst in TC solution, achieving adsorption-desorption equilibrium in dark for 30 min, irradiating with visible light, sampling at intervals, and analyzing TC concentration via UV-vis spectroscopy. Data Analysis Methods:

Data were analyzed using pseudo-first-order kinetics for degradation rates, TOC for mineralization, 3D EEMs for degradation properties, PL and photocurrent for charge transfer, and ESR for radical detection.