Graphene oxide (GO) synthesised by the Hummers method and modified with TiO₂ (xGO/TiO₂ with x = 2, 5, 10, 15 and 30 wt%) is used to improve the photocatalytic reactivity of TiO₂ for the dye removal. The synthesised samples were characterised by XRD, SEM/EDS, BET surface area, RDs, FTIR and EIS. Under sun irradiation, the photocatalysts exhibited efficient photoreactivity. The efficiency of the dye removal reaction increases, after 10 min of solar irradiation, from 14 to 81%upon increasing the % GO from 0 to 30%. The 30GO/TiO₂ composites exhibit better photoactivity under sunlight irradiation compared to the other composites. Thus, after 10 min of irradiation, the MO removal efficiency with the 30GO/TiO₂ photocatalyst reaches 84% of its maximum value (96%). In contrast, with TiO₂ alone, the maximum yield of 81% can only be achieved after 60 min. The modification of the catalyst with GO made it possible to decrease the reaction time necessary to reach the steady-state. Both classical and fractal-like kinetic models applied to photodegradation data showed that the Weibull model is the best fit (RMSE, ARE, R² and t_0.5). Compared to pure TiO₂, the 30GO/TiO₂ catalyst shortens the degradation time by half; the photodegradation by xGO/TiO₂ shows a decrease in mass transfer resistance inside a winding channel on the surface and in the fluid film surrounding the catalyst particles. This led to an enhancement in the mass transfer coefficient and intraparticle diffusivity on 30GO/TiO₂ catalyst of about 19 and 13 times compared to the pure TiO₂.

通过 Hummers 方法合成并用 TiO ₂改性的氧化石墨烯 (GO) （xGO/TiO ₂，x = 2、5、10、15和 30 wt%）用于提高 TiO ₂的光催化反应性以去除染料。合成的样品通过 XRD、SEM/EDS、BET 表面积、RDs、FTIR 和 EIS 进行表征。在阳光照射下，光催化剂表现出有效的光反应性。将 % GO 从 0 增加到 30% 后，在太阳照射 10 分钟后，染料去除反应的效率从 14% 增加到 81%。与其他复合材料相比，30GO/TiO ₂复合材料在阳光照射下表现出更好的光活性。因此，照射 10 分钟后，30GO/TiO ₂的 MO 去除效率光触媒达到其最大值的 84% (96%)。相比之下，单独使用 TiO ₂时，只能在 60 分钟后达到 81% 的最大产率。用 GO 对催化剂进行改性可以减少达到稳态所需的反应时间。应用于光降解数据的经典和分形动力学模型均表明 Weibull 模型是最佳拟合（RMSE、ARE、R ²和 t _0.5）。与纯TiO ₂相比，30GO/TiO ₂催化剂的降解时间缩短了一半；xGO/TiO ₂的光降解显示表面上和环绕催化剂颗粒的流体膜中的蜿蜒通道内的传质阻力降低。这导致与纯 TiO ₂相比，30GO/TiO ₂催化剂的传质系数和颗粒内扩散率提高了约 19 和 13 倍。