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Herein, we adopted subcritical hydrothermal method to synthesize the copper and bismuth co-doped CeO₂ (Ce_0.92Cu_0.04Bi_0.04O₂) nanostructure for water remediation application. Copper and Bismuth co-doping synergistically improved the current conductivity and light-harvesting capabilities of the co-doped CeO₂ that is respectively confirmed through current-voltage and optical studies. The microstructural, compositional and morphological information of the as-synthesized photocatalyst were accessed through powder XRD, and electronics spectroscopic techniques. In terms of practical application, the as-prepared co-doped CeO₂-based photocatalyst mineralized the anionic dye (methyl orange, MO) up to 95.79%, at the rate of 0.0314 min⁻¹, in just 50 min of solar irradiation. Statistics show that our Ce_0.92Cu_0.04Bi_0.04O₂ photocatalyst is 2.32 times more effective at mineralizing MO dye, and its rate of dye …