This work reports the preparation of reduced graphene-based bismuth oxybromide (G-BiOBr) nanocomposite using a facile synthesis procedure. The synthesized nanocomposite material was characterized using a powder X-ray diffractometer, transmission electron microscope, X-ray photoelectron spectroscopy and UV–vis diffuse reflectance spectroscopy. The photocatalytic efficiency of the as-prepared BiOBr and G-BiOBr nanocomposite were examined through photodegradation of rhodamine-B dye (RhB) under a visible light irradiation at 420 nm. Experimental factors (such as contact time, the dye concentration and dosage of the catalyst) were investigated using a Central Composite Design. The results revealed that G-BiOBr nanocomposite exhibits improved photocatalytic activity, ≈100% degradation, far above the as-prepared BiOBr material. The improvement in photocatalytic activity may be ascribed to improved light absorption and charge separation. Also, a mechanism was proposed to describe the improved photocatalytic degradation of RhB dye using G-BiOBr where the graphene plays a key role in electron transfer and in reducing the rate of electron-hole recombination.

这项工作报告了使用简便的合成方法制备基于还原石墨烯的氢溴酸铋（G-BiOBr）纳米复合材料。合成的纳米复合材料使用粉末X射线衍射仪，透射电子显微镜，X射线光电子能谱和UV-vis漫反射光谱来表征。通过在420 nm可见光照射下若丹明-B染料（RhB）的光降解，检测了所制备的BiOBr和G-BiOBr纳米复合材料的光催化效率。使用中央复合设计研究了实验因素（例如接触时间，染料浓度和催化剂用量）。结果表明，G-BiOBr纳米复合材料表现出改善的光催化活性，约100％降解，远高于所制备的BiOBr材料。光催化活性的改善可以归因于光吸收和电荷分离的改善。此外，有人提出了一种机制来描述使用G-BiOBr改进的RhB染料的光催化降解，其中石墨烯在电子转移和降低电子-空穴复合速率中起关键作用。