▎ 摘　　要

LaMnO3-graphene nanocomposite photocatalysts were synthesized by a sol-gel method for the first time. The as-prepared samples were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Brunauer-Emmett-Teller surface area analysis, Raman spectroscopy, X-ray photoelectron spectroscopy, and UV-vis diffuse spectroscopy. Pure LaMnO3 perovskite phase was successfully processed. It anchored on the surface of graphene sheets and had good dispersion behavior. This observation confirmed that the proposed technique was effective. High-efficiency degradation of acid red A under UV-vis light was achieved for the photocatalysts. The photocatalytic efficiency of the LaMnO3-graphene nanocomposites was higher than that of pristine LaMnO3. The enhancement of UV-vis photo catalytic light activity can be attributed to the high separation efficiency of photoinduced electron-hole pairs resulting from the excellent conductivity of graphene in LaMnO3-graphene and the large surface contact between graphene and LaMnO3, which can promote the adsorption of organic dyes and improve the transfer efficiency of the photocatalytic process. (C) 2013 Elsevier B. V. All rights reserved.