| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 53883 | Catalysis Today | 2015 | 8 Pages |
•Ag/AgBr/g-C3N4 nanocomposites were fabricated vis a one-pot and simple approach.•The ionic liquid was served not only as the Br source but also as a dispersant.•This composites show much higher visible-light photocatalytic activity than pure g-C3N4.•The enhanced visible light activity is due to the synergistic effect of the ternary system of Ag/AgBr/g-C3N4.
A series of visible-light-induced Ag/AgBr/g-C3N4 nanocomposites were fabricated vis a one-pot and simple approach. The ionic liquid 1-octyl-3-methylimidazolium bromide ([Omim]Br) was introduced into the synthesis system, and served not only as the Br source but also as a dispersant. The Ag/AgBr nanoparticles were found to be highly dispersed on the sheets of g-C3N4. The Ag/AgBr/g-C3N4 nanocomposites showed much higher visible-light-driven photocatalytic activity than individual g-C3N4 and Ag/AgBr for organic compound degradation. The optimal Ag/AgBr content with the highest photocatalytic activity is determined to be 40%, which is almost 2.4 and 1.9 times higher than that those of individual g-C3N4 and Ag/AgBr for the degradation of methylene blue (MB), and 18.8 and 1.6 folds for the degradation of phenol. The enhancement in photocatalytic activity should be assigned to the extended light-absorption range and efficient charge separation as a result of the surface plasmon resonance effect of Ag0 and the well-matched overlapping band-structure between Ag/AgBr and g-C3N4. Finally, the possible mechanism for the charge separation and transformation among Ag, AgBr and g-C3N4 ternary system under the visible light is proposed.
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