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The use of visible-light-driven photocatalysts in wastewater treatment, photoreduction of CO₂, green solar fuels, and solar cells has elicited substantial research attention. Bismuth oxyhalide and its derivatives are a group of visible-light photocatalysts that can diminish electron–hole recombination in layered structures and boost photocatalytic activity. The energy bandgap of these photocatalysts lies in the range of visible light. A simple hydrothermal method was applied to fabricate a series of bismuth oxychloride/bismuth oxyiodide/grafted graphitic carbon nitride (BiO_mCl_n/BiO_pI_q/g-C₃N₄) sheets with different contents of g-C₃N₄. The fabricated sheets were characterized through XRD, TEM, SEM-EDS, XPS, UV-vis DRS, PL, and BET. The conversion efficiency of CO₂ reduction to CH₄ of BiO_mCl_n/BiO_pI_q of 4.09 μmol g⁻¹ can be increased to 39.43 μmol g⁻¹ by compositing with g-C₃N₄. It had an approximately 9.64 times improvement. The photodegradation rate constant for crystal violet (CV) dye of BiO_mCl_n/BiO_pI_q of <i>k</i> = 0.0684 can be increased to 0.2456 by compositing with g-C₃N₄. It had an approximately 3.6 times improvement. The electron paramagnetic resonance results and the quenching effects indicated that ¹O₂, •OH, h⁺, and •O₂⁻ were active species in the aforementioned photocatalytic degradation. Because of their heterojunction, the prepared ternary nanocomposites possessed the characteristics of a heterojunction of type II band alignment.