1：Experimental Design and Method Selection:

The study involved preparing Ag2S/BiFeO3 composites via a precipitation method, characterizing them using XRD, SEM, TEM, XPS, UV-Vis, and PL, and evaluating their catalytic activities through degradation tests of methyl orange under visible light with and without H2O

2：Sample Selection and Data Sources:

Samples included bare Ag2S, BiFeO3, and Ag2S/BiFeO3 composites with different mass fractions (5%, 10%, 15%, 20%). Methyl orange was used as the model pollutant.

3：List of Experimental Equipment and Materials:

Equipment included a 300 W xenon lamp with a 420 nm cut-off filter, electrochemical workstation (CHI 660C), XRD diffractometer (D8 Advance), SEM (JSM-6701F), TEM (JEM-1200EX), XPS spectrometer (PHI-5702), UV-Vis spectrophotometer (TU-1901), fluorescence spectrophotometer (RF-6000), and autoclave. Materials included AgNO3, Na2S, Bi(NO3)3·5H2O, Fe(NO3)3·9H2O, KOH, H2O2, ethanol, ammonium oxalate, benzoquinone, terephthalic acid, and others.

4：Experimental Procedures and Operational Workflow:

Synthesis of Ag2S nanoparticles, BiFeO3 polyhedra, and Ag2S/BiFeO3 composites; catalytic activity tests with sampling and centrifugation; photoelectrochemical measurements; hydroxyl radical detection; and characterization steps.

5：Data Analysis Methods:

Kinetic analysis using first-order rate constants, statistical methods for standard deviation, and software tools for instrument data processing.