1：Experimental Design and Method Selection:

A one-step solvothermal method was used to synthesize the Bi/BiOBr/G nanocomposite, employing ethylene glycol as both solvent and reducing reagent. This method was chosen for its simplicity and efficiency in producing the ternary photocatalyst at lower temperatures and shorter times compared to previous methods.

2：Sample Selection and Data Sources:

Graphite oxide (GO) was prepared by Hummers' method. The synthesis involved dissolving Bi(NO3)3·5H2O in ethylene glycol, adding KBr dissolved in deionized water, mixing with GO suspension, and heating in a Teflon-lined autoclave. Comparative samples (Bi/BiOBr, BiOBr, BiOBr/G) were prepared similarly with variations in reagents.

3：List of Experimental Equipment and Materials:

Equipment included powder X-ray diffractometer (XRD, Bruker D8 Advance), X-ray photoelectron spectroscopy (XPS, PHI-5000versaprobe), Fourier transform infrared spectrometer (FTIR, Nicolet iS50), field emission scanning electron microscopy (FESEM, SUPRA 55), transmission electron microscope (TEM, JEOL 2100), Brunauer-Emmett-Teller analysis (BET, ASAP2460), UV-vis diffuse reflectance spectroscopy (UV-vis DRS, UV-2700), photoluminescence spectroscopy (PL, Jobin Yvon SPEX Fluorolog 3P), and a 500 W Xe lamp with a 420 nm cut-off filter for photocatalytic testing. Materials included Bi(NO3)3·5H2O, KBr, ethylene glycol, deionized water, GO colloid, Rhodamine B, isopropanol, benzoquinone, potassium iodide.

4：Experimental Procedures and Operational Workflow:

The synthesis involved dissolving and mixing reagents, stirring, heating in an autoclave at 160°C for 12 hours, washing, and drying. Photocatalytic activity was evaluated by adding catalyst to RhB solution, stirring in darkness for adsorption-desorption equilibrium, irradiating with visible light, sampling at intervals, centrifuging, and analyzing with UV-vis spectrophotometer. Radical scavengers were used to identify active species.

5：Data Analysis Methods:

Data were analyzed using XRD for phase identification, XPS for elemental composition, FTIR for functional groups, SEM and TEM for morphology, BET for surface area, UV-vis DRS for light absorption, PL for charge carrier recombination, and pseudo-first-order kinetic equation for degradation kinetics.