A novel photocatalyst of LaMnO3/graphene thin films with the perovskite-type was synthesized by sol-gel process assisted with spin-coating methods on glass substrates. The prepared samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Brumauer-Emmett-Teller (BET) surface area analyzer, X-ray photoelectron spectroscopy (XPS) and UV-vis diffuse reflectance spectroscopy. Results showed that after the introduction of gra-phene, the perovskite structure was unchanged and the size of LaMnO3 particles was about 22 nm, which uniformed growth in gra-phene sheet. Determination of contact angle indicated that the contact angle of glass substrate decreased and the hydrophilicity im-proved after treating with H2SO4 and APTES. The UV-Vis photocatalytic activity of the photocatalysts was evaluated by the degrada-tion of diamine green B. LaMnO3/graphene thin films had better photocatalytic ability than LaMnO3 and TiO2 films. The obtained k was 0.5627 and 0.3441 h–1 corresponding to LaMnO3/graphene films and TiO2 films, respectively.
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