Abstract
Mesoporous Li2MnO3/BaSnO3 nanocomposites were constructed by sol-gel and impregnation approaches. The photocatalytic performance of Li2MnO3/BaSnO3 nanocomposites was assessed by Atrazine degradation as a probe herbicide molecule under visible light illumination. The optimum 15%Li2MnO3/BaSnO3 photocatalyst degraded the Atrazine completely (100%) after 50 min of illumination, which was enhanced two times larger than bare BaSnO3 NPs. The apparent rate constant of 15%Li2MnO3/BaSnO3 nanocomposite was about 3.11 times greater than bare BaSnO3 NPs. The results revealed that incorporating Li2MnO3 and BaSnO3 efficiently strengthened the separation of photoinduced carriers and extended the absorption of visible light. Due to the obtained nanocomposites having a porous structure, the Atrazine molecules are easily moved to the active sites with a large •OH radical concentration and reduced light scattering. The photocatalytic ability of Li2MnO3/BaSnO3 nanocomposite was a little minimized after five cycles of Atrazine degradation due to its high photocatalytic stability. The appropriate band bending of heterojunction Li2MnO3/BaSnO3 nanocomposite could be promoted the transport of photoinduced electrons toward the heterogeneous interface through the S-scheme mechanism, thus significantly prohibiting recombination and promoting the separation efficiency of carriers.
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