The coexistence of heavy metals and organic pollutants in aquatic ecosystems poses significant threats to environmental and human health. To address this issue, a novel carbon film-modified Bi5O7I photocatalyst (C/Bi5O7I) was developed for the simultaneous removal of bisphenol-A (BPA) and Cr(VI) under visible light. The C/Bi5O7I composite exploited the synergistic effect between the carbon film and Bi5O7I, enhancing light absorption and facilitating efficient electron transfer, which promoted the separation of electron-hole pairs. This mechanism enabled holes to degrade BPA and electrons to reduce Cr(VI), with each process mutually accelerating the other.The composite exhibited high photocatalytic activity across a wide pH range (3.0–11.0) and was minimally inhibited by typical water matrix components. Characterization techniques and theoretical calculations were employed to elucidate the degradation pathways, confirming the stability and efficiency of C/Bi5O7I over 
multiple cycles. This makes C/Bi5O7I a promising material for treating wastewater contaminated with coexisting heavy metals and organic pollutants.