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In this study, rGO/Bi 2 O 2 CO 3 /BiOCl composite photocatalysts were prepared using a one-step solvothermal method. The formation and morphology of these photocatalysts were characterized through XRD, Raman, XPS, SEM, TEM, and other techniques. The efficiency of the composite photocatalysts was assessed by decreasing RhB under visible light. Among them, the photocatalytic activity of 4 wt% rGO/Bi 2 O 2 CO 3 /BiOCl was discovered to be the best, with a degradation rate as high as 96 % within 60 min. This is because the inclusion of rGO not only increased the specific surface area of the ternary materials, but also acted as a carrier for electrons transfer. Besides, the heterojunction structure constituted between Bi 2 O 2 CO 3 and BiOCl also opens up a new pathway for carrier separation. Finally, we explored the degradation mechanism of rGO/Bi 2 O 2 CO 3 /BiOCl ternary materials in detail. This study holds an important reference for the synthesis of bismuth-based composite photocatalysts and has potential applications in wastewater treatment. [Display omitted] • The rGO/Bi 2 O 2 CO 3 /BiOCl photocatalysts were synthesized using a simple one-step solvothermal method. • The ternary photocatalysts represented excellent photocatalytic activity on degrading RhB under visible light. • Here is one major reason for the increase in catalytic activity: fast multiple charge transfer paths. • The degradation mechanism utilizes three active free radicals efficiently, and the degradation effect is remarkable. [ABSTRACT FROM AUTHOR]