In this research, at first graphitic carbon nitride (g-C 3 N 4 ) was prepared by urea as a precursor and its structure was then changed to nanosheets by ultrasonic irradiation. In the next step, titanium dioxide (TiO 2 ) was immobilized on the nanosheet surface by reflux. A spray dryer was used to produce a granulated form of the compounds to achieve an improved properties. The prepared compounds where characterized by FT-IR, SEM, XRD, BET, TEM, UV-DRS, EDX and PL. The photocatalytic activity of graphitic carbon nitride, granule and non-granule nanocomposites on the oxidation of benzyl alcohol and reduction of 4-nitrophenol were investigated under visible light irradiation. The GC-MS analyses for the oxidation reaction of benzyl alcohol showed a high conversion percent. In addition, the granulated photocatalyst demonstrated a high selectivity for the oxidation of benzyl alcohol. The effect of several parameters including reaction temperature, amount of photocatalyst, irradiation time, solvent and photocatalyst type was investigated and optimized. The UV-Vis results for reduction of 4-nitrophenol revealed that the granulated photocatalyst has higher reaction yield. Finally, the DFTB+ method was used to investigate the frontier orbitals and to determine the band gap of the compounds . The theoretical results are in agreement with the experimental findings.