采用电泳沉积技术在氧化铟锡(indium tin oxide,ITO)导电玻璃基底上制备出LaMnO3/石墨烯薄膜。通过扫描电子显微镜、透射电子显微镜、X射线衍射、Raman光谱、紫外-可见吸收光谱和荧光光谱等测试手段探讨了电场强度、溶液的浓度、沉积时...采用电泳沉积技术在氧化铟锡(indium tin oxide,ITO)导电玻璃基底上制备出LaMnO3/石墨烯薄膜。通过扫描电子显微镜、透射电子显微镜、X射线衍射、Raman光谱、紫外-可见吸收光谱和荧光光谱等测试手段探讨了电场强度、溶液的浓度、沉积时间等参数对薄膜结构和表面形貌的影响。结果表明,晶粒粒径约为20nm的LaMnO3较均匀地生长在石墨烯片上,且复合膜的厚度受到电场强度、电泳时间和悬浮液浓度的共同作用。光催化性能研究表明,LaMnO3/石墨烯薄膜的光催化活性显著优于纯LaMnO3薄膜,且还原氧化石墨烯的含量为2%时,该薄膜的光催化性能最好,3h内对直接绿的脱色率达到了98.8%。展开更多
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 scanni...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.展开更多
文摘采用电泳沉积技术在氧化铟锡(indium tin oxide,ITO)导电玻璃基底上制备出LaMnO3/石墨烯薄膜。通过扫描电子显微镜、透射电子显微镜、X射线衍射、Raman光谱、紫外-可见吸收光谱和荧光光谱等测试手段探讨了电场强度、溶液的浓度、沉积时间等参数对薄膜结构和表面形貌的影响。结果表明,晶粒粒径约为20nm的LaMnO3较均匀地生长在石墨烯片上,且复合膜的厚度受到电场强度、电泳时间和悬浮液浓度的共同作用。光催化性能研究表明,LaMnO3/石墨烯薄膜的光催化活性显著优于纯LaMnO3薄膜,且还原氧化石墨烯的含量为2%时,该薄膜的光催化性能最好,3h内对直接绿的脱色率达到了98.8%。
基金Project supported by Project supported by the National Natural Science Foundation of China(51402253)the Research Program of the College Science&Thechnology of Hebei Province(QN 20131026)the Technology Support Program of Hebei Province(13214903)
文摘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.
