Abstract
A series of plasmonic Ag/Bi2O2CO3 photocatalytic nanocomposites was biosynthesized readily by a facile, green procedure at hydrothermal temperature as low as 65 °C from Bi(NO3)3, Na2CO3, AgNO3, and ethanolic Acacia hybrid leaf extract. The results showed that, by using Acacia hybrid leaf extract as a novel silver reduction agent, the spherical-like Ag nanoparticles crystallized in a rarely-found hexagonal phase with grain sizes from 6 to 15 nm. These nanoparticles exhibiting a surface plasmon resonance (SPR) effect in a broad visible light region from 400 to 800 nm were loaded on the surface of Bi2O2CO3 nanosheets to form Ag/Bi2O2CO3 nanocomposite. The methylene blue photogradation efficiency of the optimized nanocomposite (84 %) is significantly superior to that of pure Bi2O2CO3 (22 %) after 5 h of visible light irradiation. The enhanced visible light absorption arising from the SPR effect induced by plasmonic Ag nanoparticles and a heterojunction formed between Bi2O2CO3 nanosheets and these nanoparticles were supposed to be main reasons for the great enhancement in photocatalytic activity of Ag/Bi2O2CO3 nanocomposite.
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