采用固相法合成AgNbO3/石墨烯复合纳米材料，利用透射电子显微镜(TEM)及紫外-可见漫反射光谱(UV-Vis)对样品的形貌及光学性质进行了表征。研究发现，AgNbO3与石墨烯复合后，带隙能明显降低，吸收光波长范围增大。以甲基橙溶液的降解为光催化模型反应评价了AgNbO3/石墨烯复合纳米材料的可见光催化性能。结果表明：与纯AgNbO3相比，AgNbO3/石墨烯复合纳米材料对甲基橙的可见光催化性能明显增强。实验条件下，经300 ℃煅烧的AgNbO3/石墨烯(2∶1)复合纳米材料表现出最优的催化性能，它对甲基橙的可见光催化脱色速率系数约为纯AgNbO3的10倍。光催化降解机理研究表明，促使甲基橙降解脱色的主要活性物种为·O-2 和 h+。

AgNbO3/graphene nanocomposites were synthesized via the technique of solid-solid grinding and subsequent sintering process. Surface structures and optical properties of the prepared materials were characterized by transmission electron microscopy and UV-Vis diffuse reflection spectroscopy. The results indicate that band-gap of AgNbO3 is lowered upon compositing with graphene nanoparticles, thereby giving an absorption in a large range of wavelengths. Degradation of methyl orange (MO) is carried out to evaluate the photocatalytic activity of AgNbO3/graphene nanocomposites under visible light irradiation. Compared with pure AgNbO3, AgNbO3/graphene composites exhibit significantly enhanced photocatalytic activity for MO. Moreover, AgNbO3/graphene (2∶1) obtained at 300 ℃ exhibits the highest degradation degree of MO after an irradiation of 120 min with apparent kapp of 0.034 min-1, which is about 10 times than that of the pure AgNbO3. The tests of radical scavengers confirm that ·O-2 and h+ are the main reactive species for the degradation of MO.