Multifunctional Photocatalytic Degradation of Methylene Blue Using LaMnO3/Fe3O4 Nanocomposite on Different Types of Graphene

[摘要] This study added different types of graphene (GN-1 and GN-2) in to LaMnO3/Fe3O4nanocomposite to degrade MB as an organic pollutant. LaMnO3/Fe3O4/GN-1 and LaMnO3/Fe3O4/GN-2 composites were synthesized using the co-precipitation method in a constant 5 wt% of GN. The as-prepared samples were characterized using XRD and TGA. The LaMnO3/Fe3O4/GN-1 and LaMnO3/Fe3O4/GN-2 composites showed the orthorhombic structure of LaMnO3nanoparticles and the cubic spinel of Fe3O4nanoparticles, as well as of GN-1 and GN-2. The graphite structure of NGP in LaMnO3/Fe3O4/GN-1 composites was confirmed. However, the peak of graphene in LaMnO3/Fe3O4/GN-2 could not be identified. The photocatalytic efficiency of the LaMnO3/Fe3O4/GN-2 was higher than that of LaMnO3/Fe3O4/GN-1. The enhancement of the photocatalytic light activity can be attributed to the high separation efficiency of electron-hole recombination and to the large surface contact between LaMnO3/Fe3O4and graphene, which can improve the transfer efficiency of the photocatalytic process. In addition, the effects of catalyst dosage, rate constant, and scavengers were investigated and discussed.

[发布机构] Departemen Fisika, Fakultas MIPA, Universitas Indonesia, Kampus UI Depok, 16424, Indonesia^1;Integrated Laboratory of Energy and Environment, Fakultas MIPA, Universitas Indonesia, Kampus UI Depok, 16424, Indonesia^2

[效力级别] 化学

[关键词] Coprecipitation method;Electron-hole recombination;Graphite structures;High separation efficiency;Orthorhombic structures;Photo catalytic degradation;Photocatalytic efficiency;Photocatalytic process