Reduced graphene oxide (rGO)/TiO₂/BiOI ternary composites with different Bi/Ti molar ratios were prepared by a hydrothermal method. Their photocatalytic activities were investigated using methyl orange as a simulated pollutant. SEM, XRD, UV–vis diffuse reflectance spectroscopy, XPS and electrochemical tests were used to characterize their microstructures, light absorption properties and the mobility of photogenerated carriers. Results show that under visible light irradiation, the rGO/TiO₂/BiOI composite with a Bi/Ti molar ratio of 80% exhibits a highest degradation rate of 98% for methyl orange within 20 min. The TiO₂ nanoparticles are uniformly attached to BiOI nanosheets that are stacked on rGO sheets to form a heterostructure. The heterostructured rGO/TiO₂/BiOI has strong visible light absorption, which improves the separation efficiency of the photogenerated carriers and accelerates the carrier migration rate, thus increasing the photocatalytic activity of the catalyst.

采用水热法制备了不同Bi / Ti摩尔比的还原氧化石墨烯（rGO ）/ TiO ₂ / BiOI三元复合材料。使用甲基橙作为模拟污染物研究了它们的光催化活性。SEM，XRD，UV-vis漫反射光谱，XPS和电化学测试用于表征其微观结构，光吸收特性和光生载流子的迁移率。结果表明，在可见光照射下，Bi / Ti摩尔比为80％的rGO / TiO ₂ / BiOI复合材料在20分钟内对甲基橙表现出98％的最高降解率。TiO ₂纳米颗粒均匀地附着到BiOI纳米片上，然后将其堆叠在rGO片上以形成异质结构。异质结构rGO / TiO₂ / BiOI具有很强的可见光吸收能力，从而提高了光生载流子的分离效率并加快了载流子迁移速率，从而提高了催化剂的光催化活性。