Preparation of La MnO3/graphene thin films and their photocatalytic activity
来源期刊：Journal of Rare Earths2014年第12期
论文作者：胡婕 门杰 马嘉华 黄浩
文章页码：1126 - 1134
摘 要：A novel photocatalyst of La MnO3/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 graphene, the perovskite structure was unchanged and the size of La MnO3 particles was about 22 nm, which uniformed growth in graphene sheet.Determination of contact angle indicated that the contact angle of glass substrate decreased and the hydrophilicity improved after treating with H2SO4 and APTES.The UV-Vis photocatalytic activity of the photocatalysts was evaluated by the degradation of diamine green B.La MnO3/graphene thin films had better photocatalytic ability than La MnO3 and Ti O2 films.The obtained k was 0.5627 and 0.3441 h–1 corresponding to La MnO3/graphene films and Ti O2 films, respectively.
胡婕1,2，门杰1，马嘉华1，黄浩2
1. Hebei Key Laboratory of Applied Chemistry, Department of Environment and Chemistry, Yanshan University2. State Key Laboratory of Metastable Materials Science & Technology, Yanshan University
摘 要：A novel photocatalyst of La MnO3/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 graphene, the perovskite structure was unchanged and the size of La MnO3 particles was about 22 nm, which uniformed growth in graphene sheet.Determination of contact angle indicated that the contact angle of glass substrate decreased and the hydrophilicity improved after treating with H2SO4 and APTES.The UV-Vis photocatalytic activity of the photocatalysts was evaluated by the degradation of diamine green B.La MnO3/graphene thin films had better photocatalytic ability than La MnO3 and Ti O2 films.The obtained k was 0.5627 and 0.3441 h–1 corresponding to La MnO3/graphene films and Ti O2 films, respectively.
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