1：Experimental Design and Method Selection:

The study involved synthesizing BiOI via ultrasound-assisted hydrolysis and loading precious metals (Pt, Au, Ag) using photochemical deposition. Various characterization techniques (XRD, FESEM, UV-vis DRS, XPS, PL, ESR) were employed to analyze material properties. Photocatalytic activity was assessed by degrading MC-LR under visible light, with kinetics and active species investigated.

2：Sample Selection and Data Sources:

BiOI was synthesized from Bi(NO3)3·5H2O and KI. Precious metal solutions (Pt, Au, Ag ions) at concentrations corresponding to 0.5, 1.0, 2.0, and 3.0 wt% loadings were used. MC-LR was the target pollutant.

3：5, 0, 0, and 0 wt% loadings were used. MC-LR was the target pollutant. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Equipment included SEM (SUPRA55, Zeiss), XRD (D/max 2500 PC, Rigaku), FTIR (Nicolet iS50, Thermo Fisher), XPS (ESCALAB 250XI, Thermo), UV-Vis DRS (UV-3600, Shimadzu), PL spectrometer (CaryEclipse), ESR analyzer (Bruker A300), photochemical reactor (GHX-2) with Xe lamp, HPLC with C18 column. Materials included Bi(NO3)3·5H2O, KI, precious metal salts, MC-LR, deionized water, ethanol, scavengers (EDTA-2Na, t-BuOH, BQ).

4：Experimental Procedures and Operational Workflow:

BiOI preparation: Dissolve Bi(NO3)3·5H2O, add KI dropwise, settle, wash, dry. M/BiOI preparation: Mix BiOI with metal ion solutions, irradiate with Xe lamp, settle, dry. Characterization: Perform XRD, SEM, XPS, UV-Vis, PL, ESR analyses. Photocatalytic degradation: Add catalyst to MC-LR solution, stir in dark for adsorption equilibrium, irradiate with visible light, sample at intervals, centrifuge, analyze by HPLC.

5：Data Analysis Methods:

Degradation kinetics fitted to pseudo-first-order model. Statistical analysis of degradation rates. ESR and scavenger experiments to identify active species. Toxicity assessed using luminescent bacteria inhibition test.