1：Experimental Design and Method Selection:

A two-chamber photoelectrochemical system was designed to study the simultaneous removal of Cr(VI) and BPA degradation under solar light irradiation. The system utilized a BiVO4 photoanode for oxidation and a dopamine-modified carbon felt (DPA/CF) cathode for reduction, with electrochemical control via a workstation.

2：Sample Selection and Data Sources:

Synthetic wastewater containing 10 mg/L Cr(VI) and 10 mg/L BPA was used, with Na2SO4 as the electrolyte. Samples were analyzed for Cr(VI), Cr(III), and BPA concentrations using standard methods.

3：List of Experimental Equipment and Materials:

Carbon felt (CF) from Tetan Co. Ltd., China; hydrochloride dopamine from Ark Pharm USA; BiVO4 photoanode prepared using Kuang's method; electrochemical workstation (CHI 660E, Chenhua Instruments, China); Xe lamp (KGS40S3, Beijing Perfect Light, China) for solar simulation; SEM (SU8020, HITACHI, Japan); XRD (D8, Bruker, Germany); XPS (ESCALAB 250Xi, Thermo Fisher Scientific); HPLC (LC-20AT, Shimadzu, Japan).

4：Experimental Procedures and Operational Workflow:

The DPA/CF cathode was prepared by dopamine self-polymerization on CF. Experiments were conducted in a two-chamber reactor with controlled pH, applied potentials, and light conditions. Cr(VI) removal and BPA degradation were monitored over time, with analyses performed using specified instruments.

5：Data Analysis Methods:

Data were analyzed using Langmuir and Freundlich models for adsorption isotherms, pseudo-first-order kinetics for reduction rates, and XPS for surface composition changes.