Photocatalytic degradation is one of the best eco-friendly methods used for wastewater treatment in the advanced oxidation process (AOP). In the photocatalyst era, transition metal oxides (TMO's) and rare earth metal oxides (RMO's) supported heterogeneous nanomaterial has recently emerged as the next-generation photocatalysts. In the current study, WO3:CeO2-supported gC3N4 nanomaterial (GWC) was prepared by a modified hydrothermal method. The prepared GWC photocatalyst was characterized by UV-DRS, FT-IR, XRD, AFM, FE-SEM, HR-TEM, and EDAX techniques. The bandgap energy of the prepared photocatalyst was calculated by UV-DRS analysis. The band gap concluded that the GWC photocatalyst was photo-responsive in both UV and visible light irradiation and, hence, active under sunlight irradiation. The particle size of GWC was calculated from XRD and found to be 17.6 – 41.7 nm. The photocatalytic activity (PCA) of the prepared GWC nanomaterial was examined by the photocatalytic degradation of organic dye (Orange G) under different light sources. GWC 2 exhibited the maximum degradation percentage for Orange G dye in both visible (99.82 %) and sunlight (99.73 %) irradiation. The prepared GWC 2 photocatalyst had a better degradation percentage in an acidic medium (≥99 %), compared to a neutral medium (≥93 %). The enhanced and rapid photocatalytic activity of GWC 2 is due to the presence of WO3 with CeO2 on the gC3N4 surface. This WO3:CeO2-supported gC3N4 photocatalyst is practically helpful in removing environmental pollutants in real-time wastewater. © 2024 Elsevier B.V., All rights reserved.