Prparation And Photocatalytic Activity Of LaMnO₃ Nanorods-reduced Graphene Oxide Nanocomposite

Perovskite-type oxides have the advantages of stable structure,narrow band gap and high solar energy utilization rate,which make it a hot spot in the field of photocatalysis.In the study of perovskite-type oxides,the morphology of perovskite-type oxides has a great inflence on its photocatalytic activity.When the perovskite-ype oxide is one-dimensional nanorods,the electron transfer rate can be increased,the recombination probability of the photogenerated electrons and holes can be reduced and the photocatalytic activity can be enhanced.Reduced graphene oxide is a new type of two-dimensional planar carbonaceous nanomaterials,which can be combined with perovskite-type oxides to reduce the agglomeration of nano-powders,and play a good role of supporting and synergistic.The schottky barrier will be formed between Ag and semiconductor material,which can improve the quantum efficiency of photocatalysis,and increase the photocatalytic performance of the material.In this paper,LaMnO₃ nanorods were synthesized by template-assisted hydrothermal method.The morphology and properties of prepared LaMnO₃ nanorods were characterized by scanning electron microscopy,X-ray diffraction,diffuse reflectance and fluorescence.The best hydrothermal conditions were confirmed to be heat time 12 h,hydrothermal temperature 180? and template CTAB content 0.07 mmol.In this paper,LaMnO₃ nanorod-xwt% reduced graphene oxide composites?x= 5,7.5,10,12.5?were prepared by in-situ synthesis template-assisted hydrothermal method.The activities of samples were studied by the degradation of direct green BE,which determines while the content of reductive graphene is 10%,the photocatalytic effect is the best and the decolorizing rate is 97.38%.The Phase analysis of LaMnO₃ nanorod-10%reduced graphene composites was characterized by means of transmission electron microscopy and BET.It was observed that LaMnO₃ nanorods were homogeneously dispersed on the surface of the reductive graphene oxide,and the pore volume and surface area of the composites were both larger than those of pure La MnO₃ nanorods.Ag/LaMnO₃ nanorod-10% reductive graphene composites were synthesized by hydrothermal method combined with silver mirror reaction.It was confirmed by X-raydiffraction and scanning electron microscopy that Ag was existed in the form of simple substance.The Ag/LaMnO₃ nanorod-10% reductive graphene composites was used by degradation of direct green BE and the degradation efficiency is 99.84%.