In this study, photocatalysis experiments were conducted under natural sunlight irradiation to degrade methylene blue (MB) dye in the presence of rGO/TiO₂. The individual effect of three control factors, namely MB dye concentration, photocatalyst (PC) loading and pH were studied. In addition, these factors were optimized by the Taguchi method. The results reveal that the most influential factor was pH followed by MB dye concentration and PC loading. The optimal conditions for dye removal were at MB concentration of 80 ppm with a PC loading of 0.15 g at 8 pH. It showed 95% degradation. Moreover, regression analysis was performed to validate the experimental results with the predicted results. This is followed by characterization of the PC by TGA, FTIR, FE-SEM, XPS, XRD, UV–Vis DRS, GC-MS, PL and ESR to determine the stability, concentration, bandgap, and to validate the anchoring of TiO₂ on rGO.

在这项研究中，在自然阳光照射下进行光催化实验，以在 rGO/TiO ₂存在下降解亚甲蓝 (MB) 染料. 研究了三个控制因素，即 MB 染料浓度、光催化剂 (PC) 负载和 pH 值的单独影响。此外，这些因素通过田口方法进行了优化。结果表明，影响最大的因素是 pH，其次是 MB 染料浓度和 PC 负载。去除染料的最佳条件是 MB 浓度为 80 ppm，PC 负载量为 0.15 g，pH 值为 8。它显示了 95% 的降解。此外，进行回归分析以验证实验结果与预测结果。然后通过 TGA、FTIR、FE-SEM、XPS、XRD、UV-Vis DRS、GC-MS、PL 和 ESR 对 PC 进行表征，以确定稳定性、浓度、带隙并验证 TiO ₂的锚定在 rGO 上。