In this research, first of all, graphitic carbon nitride (CN) was prepared by urea as a precursor and then the prepared g-C 3 N 4 was treated with hot nitric acid to obtain carboxylated g-C 3 N 4 (CCN). In the next step, Rose Bengal (RB) was covalently bonded to CN and CCN via two different strategies. The prepared compounds were characterized by FT-IR, FE-SEM, EDX, XRD, BET, TEM, UV-Vis DRS, UV-Vis spectroscopy, photoluminescence, elemental analysis and TGA. The photocatalytic activity of graphitic carbon nitride, carboxylated g-C 3 N 4 and their hybrid with RB on the oxidation of benzyl alcohol was investigated under the visible light irradiation. The results obtained from the GC-MS analyses related to the oxidation reaction showed the highest percentage of benzyl alcohol conversion and benzaldehyde selectivity for the hybrid structures compared to the bare Rose Bengal, graphitic carbon nitride and carboxylated g-C 3 N 4 . The effect of several parameters, including amount of photocatalyst and promoter, irradiation time and photocatalyst type, was studied and optimized. Finally, the optimized structure, energy gap and frontier orbitals of Rose Bengal/graphitic carbon nitride were determined by DFT method and the results displayed the calculations are in agreement with the experimental findings.