1：Experimental Design and Method Selection:

The study employed an in-situ growth method to synthesize a CdS/rGO/BiOI Z-scheme system. The methodology focused on promoting the transmission of photoinduced carriers and enhancing photocatalytic activity.

2：Sample Selection and Data Sources:

Methyl 3,5-dichloro-4-hydroxybenzoate (MDHB) was used as the model chlorinated paraben. The samples were characterized using various techniques including XRD, SEM, TEM, XPS, FT-IR, Raman spectroscopy, UV-Vis DRS, PL spectroscopy, and ESR.

3：List of Experimental Equipment and Materials:

Equipment included a polycrystalline X-ray diffractometer, SEM (HITACHI-S4800), HRTEM (JEM-2010), XPS (ESCSLAB 250Xi), UV-Vis spectrophotometer (UV-2600), fluorescence spectrophotometer (HITACHI F-7000), microscope confocal Raman spectrometer (LabRAM Aramis), FT-IR spectrometer (IRAffinity-1), and ESR. Materials included MDHB, CdN2O6·4H2O, Bi(NO3)3·5H2O, NH4I, and graphene oxide.

4：Experimental Procedures and Operational Workflow:

The CdS/rGO/BiOI composite was synthesized via a hydrothermal process. Photocatalytic experiments were conducted under visible light irradiation, and samples were analyzed at given intervals.

5：Data Analysis Methods:

The photocatalytic activity was evaluated by monitoring the degradation of MDHB and the evolution of chloride ions. Active species were identified through trapping experiments and ESR analysis.