【摘要】 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·O₂^-和h+。更多还原

【Abstract】 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 AgNbO₃is 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 kappof 0. 034 min- 1,which is about 10 times than that of the pure AgNbO₃. The tests of radical scavengers confirm that ·O-2and h+are the main reactive species for the degradation of MO.更多还原