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This study provides an overview of photocatalysts and their history, as well as information on their fundamentals, the photocatalytic process, and the thermodynamics of the photocatalytic process. Selection criteria, material qualities, and potential uses for the three materials (TiO2, graphene, and gold) have also been explored. The results reveal that although pure TiO2 has a negligible MB dye degradation efficiency in a dark media, a rGO1-TiO2 photocatalyst has a very high one. The results also show that the addition of graphene oxide enhances the TiO2's efficacy in degrading MB dye. The MB dye is degraded by the rGO1-TiO2 photocatalyst by about 60% in dark media. Degradation and mineralization of MB dye may be seen in 105 minutes when TiO2 is present under illumination. In contrast, rGO1-TiO2 photocatalysts rapidly deteriorate after 60 minutes. Hence, only rGO1-TiO2 was subjected to further Au loading. When comparing the photo-catalytic activity of the various produced catalysts, A2rGO-TiO2 (with 2.0 wt% of Au) stands out as having the highest rate, with about 95% of MB degraded after 45 minutes.