In this study, graphene oxide was prepared by the oxidation of natural graphite flakes (≤50 μm) using Hummer's method. Nanoparticles of nanocomposites based on titanium dioxide and reduced graphene oxide (TiO2@rGO) with percentage weights of rGO of 4, 8, and 16 wt.%, were prepared by the hydrothermal/solvothermal synthesis method and thermally treated at 300 °C. The synthesised photocatalysts were characterised by various structural, morphological, and optical characterisation methods for nanomaterials. The adsorption and photocatalytic activity of the prepared TiO2@rGO nanocomposite were tested on their efficacy in the removal of methylene blue dye from water. Furthermore, the photocatalytic efficiency of the prepared photocatalysts was tested by changing various parameters such as the irradiation source, the concentration of the catalyst, the initial concentration of the dye model solution, the pH of the dye solution and the water matrix. The possibility of reusing TiO2@rGO photocatalyst for three cycles was tested. The results obtained for the characterisation of the prepared materials indicate the existence of interactions between TiO2 and rGO, i.e., the Ti–O–C bond, which confirms the successful preparation of TiO2@rGO nanocomposites. The addition of rGO increased the specific surface area, decreased the band gap energy, and increased the photocatalytic efficiency of methylene blue removal from water compared to TiO2 nanoparticles. The results of photocatalytic activity indicate that the amount of rGO in the prepared TiO2@rGO nanocomposites plays a significant role in the application of different photocatalytic parameters. The optimal amount (8 wt.%) of reduced graphene oxide in the nanocomposite for the efficient photocatalytic decomposition of methylene blue was determined. It was determined that the optimal photocatalytic efficiency of methyl dye degradation was achieved 99.20 % for an initial dye concentration of 10 mg·L– 1 and an initial catalyst concentration of 0.5 g·L– 1 at 22 ± 0.5 °C. It was found that the pseudo first-order model is acceptable for describing the kinetics of the photocatalytic decomposition of methylene blue using the prepared photocatalysts. The results showed that the TiO2@rGO_8 wt.% nanocomposite can be used for three consecutive cycles while maintaining photocatalytic activity over 90 %.