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- Title
Enhanced photocatalytic activity of BiFeO particles by surface decoration with Ag nanoparticles.
- Authors
Di, L.; Yang, H.; Hu, G.; Xian, T.; Ma, J.; Jiang, J.; Li, R.; Wei, Z.
- Abstract
BiFeO particles with different morphologies and sizes were synthesized via a hydrothermal process, where the morphology and size was tailored by using different KOH concentrations in precursor solution. The samples prepared at n(KOH) = 3, 4.5, 6, and 7.5 M are composed, respectively, of octahedron-shaped particles (500-600 nm), cube-like particles (200-500 nm), irregular spherical agglomerates (9-16 μm) formed from disk-like grains with diameter of 1.4-2.8 μm and thickness of 0.2 μm, and cuboid-shaped particles with length-to-width ratio of 1.4:1-3.5:1 and width size ranging from 80 to 280 nm. Ag nanoparticles were deposited on the surface of BiFeO particles by a chemical reduction method to produce Ag@BiFeO nanocomposites. The photocatalytic activity of prepared samples was evaluated by degrading rhodamine B under simulated sunlight irradiation. It is demonstrated that Ag-decorated BiFeO particles exhibit an enhanced photocatalytic activity compared to bare BiFeO particles. This can be explained by the effective transfer of photogenerated electrons from the conduction band of BiFeO to Ag nanoparticles and hence increased availability of holes for the photocatalytic reaction. Hydroxyl radicals were detected by the photoluminescence technique using terephthalic acid as a probe molecule and are found to be produced over the irradiated BiFeO and Ag@BiFeO photocatalysts; especially, an enhanced yield is observed for the latter.
- Subjects
PHOTOCATALYSIS; BISMUTH iron oxide; SILVER nanoparticles; CHEMICAL reduction; SYNTHESIS of Nanocomposite materials; HYDROXYL group; PHOTOLUMINESCENCE; RHODAMINE B
- Publication
Journal of Materials Science: Materials in Electronics, 2014, Vol 25, Issue 6, p2463
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-014-1896-0