Synthesis Of Ag Modified LaMnO₃-reduced Graphene Oixde And Their Photocatalytic Actinvity

Perovskite has been widely studied as a photocatalyst due to its stable structure, high catalytic activity and conductivity. A Schottky barrier can be formed between metallic Ag and semiconducter. Reduced oxide graphene was discovered and as-synthesized a new type of two-dimensional carbon nanomaterials recent years. It produces synergies in the composite with Ag, LaMnO3 and reduced graphene oxide, promote its practical application in photocatalytic aspects.This article was synthesized xwt%Ag/LaMnO3(x=2, 4, 6, 8) composite and2wt%Ag/ LaMnO3-xwt%reduced graphene oxide(x=5, 10, 15, 20) composite by sol-gel method combined with Ag+ reduction. The nanocomposites were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy and field-emission scanning electron microscopy with energy dispersive spectrometer to analyse their phase, comprise and pattern, respectively.Studies indicate that the main phase was LaMnO3 and metallic Ag acted as simple substance in the composite. The average crystallite sizes of LaMnO3 and Ag was approximately 22 and 19 nm, respectively, which was calculated in terms of the Scherrer’s formula based on the diffraction peak of LaMnO3(110) and Ag(111). The photos show that Ag/LaMnO3 had grown on the reduced oxide graphene sheets uniformly. Through the photocatalytic degradation of different dyes to determine that the degradation of Direct Green BE was the best. The results show that when the modification amount of Ag was 2% and the mass fraction of reduced oxide graphene was10%, the composite had the best degradation of Direct Green BE and the photocatalytic performance was 99.79% in 3 hours. And the composite has good recycle and stable.