▎ 摘　　要

Gd and Sn co-doped BiFeO3 nanoparticles were synthesized by sol-gel route and Bi0.95Gd0.05Fe0.93Sn0.05O3/Nitrogen doped graphene nanohybrid (BGFSO/NG, where NG: 1%, 2%, 3%, 4%, 5%, 6%) were synthesized by sprinkling BGFSO nanoparticles and NG into ethanol solution followed by thermal drying. Structural and morphological properties of BiFeO3 (BFO) nanoparticles, BGFSO nanoparticles, NG and BGFSO/NG, were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The crystallite size BGFSO nanoparticle is about 20 nm. The photocatalytic activities of the as-prepared BiFeO3 (BFO) nanoparticles, BGFSO, NG and BGFSO/NG nanohybrid were measured by the degradation of methyl orange (MO) under simulated sunlight irradiation. BGFSO/N-G nanohybrid shows enhanced photocatalytic activity. The improved photo catalytic activity is attributed to the effective transfer of photogenerated electrons from nanoparticles NG nanosheets, consequently leads to an increased availability of h + for the photocatalytic reaction. Additionally, hydroxyl (center dot OH) radicals were detected by the photoluminescence method through terephthalic acid (TPA) as a probe molecule and are found to be generated on the irradiated BGFSO and BGFSO/NG.