1：Experimental Design and Method Selection:

The study employed a sol–gel method to immobilize BiOI nanoparticles on glass fiber cloth (GFC) using silica sol as an adhesion agent. A thin-film fixed-bed reactor (TFFBR) was designed for photocatalytic degradation of bisphenol A (BPA) under simulated solar light.

2：Sample Selection and Data Sources:

BPA was used as a model pollutant. BiOI powder was synthesized via a solvothermal method. GFC was pretreated by sintering to remove impurities. Artificial sewage was prepared for realistic testing.

3：List of Experimental Equipment and Materials:

Materials included bismuth nitrate, potassium iodide, tetraethylorthosilicate (TEOS), ethanol, HCl, BPA, and GFC. Equipment included X-ray diffractometer (D/MAX 2500V, Rigaku), FESEM (LEO), TEM (JEM-2100FEF, JEOL), XPS (Axis Ultra DLD, Kratos), FT-IR spectrometer (MAGNA-560, Nicolet), photocurrent measurement system (CHI 600D, Chenhua), fluorescence spectrophotometer (FP-8500, JASCO), surface area analyzer (TriStar 3000, Micromeritics), UV–Vis spectrometer (U-3010, Hitachi), photochemical reactor (XPA-7, Xujiang), HPLC (Agilent 1260 infinity, Agilent), and peristaltic pump for TFFBR.

4：Experimental Procedures and Operational Workflow:

BiOI thin films were prepared by painting a suspension of BiOI in SiO2 sol onto GFC, drying at 100°C, and repeating for multiple layers. Characterization involved XRD, XPS, FESEM, TEM, FT-IR, DRS, BET, and photocatalytic tests in quartz tubes and TFFBR. For TFFBR, BPA solution was pumped over the film under Xe lamp irradiation, with samples analyzed by HPLC.

5：Data Analysis Methods:

Photocatalytic efficiency was calculated based on BPA concentration changes. Hydrodynamic parameters (fluid film thickness, residence time) were calculated. Statistical analysis included reusability tests and optimization of conditions.