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Heterostructured AgX/g-C3N4 (X = Cl and Br) nanocomposites via a sonication-assisted deposition-precipitation approach: Emerging role of halide ions in the synergistic photocatalytic reduction of carbon dioxide

Paper ID Volume ID Publish Year Pages File Format Full-Text
45271 46407 2016 14 PDF Available
Title
Heterostructured AgX/g-C3N4 (X = Cl and Br) nanocomposites via a sonication-assisted deposition-precipitation approach: Emerging role of halide ions in the synergistic photocatalytic reduction of carbon dioxide
Abstract

•AgX-hybridized protonated g-C3N4 (pCN) photocatalysts were prepared.•AgBr/pCN showed superior activity and recyclability toward CO2 reduction to CH4.•AgCl/pCN and AgBr/pCN exhibited Type I and Type II heterojunction, respectively.•Ag formed from the photoreduction of AgX showed surface plasmon resonance effect.•Matching band potentials of pCN, Ag and AgBr promoted the overall photoactivity.

In this work, visible-light-active silver halide AgX(X = Cl and Br) deposited on the protonated graphitic carbon nitride (pCN) photocatalyst was developed by a sonication-assisted deposition-precipitation route at room temperature. The surface morphology, phase structure, chemical composition, optical property and electronic band structures of the AgX-hybridized pCN (AgX/pCN) hybrid nanocomposites were systematically characterized. Subsequently, the photocatalytic performance of the AgX/pCN was evaluated by the reduction of CO2 to CH4 in the presence of H2O vapor under a low-power energy-saving daylight bulb at atmospheric pressure and ambient temperature. The optimal 30AgBr/pCN presented the highest photocatalytic activity, achieving a total CH4 evolution of 10.92 μmol gcatalyst−1, which was 34.1 and 4.2 times greater than those of single-phase AgBr and pCN, respectively. Furthermore, by comparing different halide ions, the photoactivity of 30AgBr/pCN was higher (by a factor of 1.3) than that of the optimal 30AgCl/pCN. The enhanced photocatalytic activity was accredited to (1) the surface plasmon resonance (SPR) effect from Ag and (2) the formation of heterojunction structure between pCN and AgBr in the AgBr/pCN hybrid photocatalysts for efficient charge transfer and separation to retard the recombination process as evidenced by the photoluminescence analysis. The effective charge separation was attributed to the matching of electronic band potentials of pCN and AgBr, exhibiting the Type II heterojunction, in comparison to that of AgCl/pCN (Type I heterojunction). Lastly, the plasmon-enhanced photocatalytic mechanisms associated with both Ag/AgBr/pCN and Ag/AgCl/pCN hybrid nanoarchitectures were critically discussed.

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Keywords
Silver halide; Protonated graphitic carbon nitride; Surface plasmon resonance; Photocatalysis; Carbon dioxide reduction
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Heterostructured AgX/g-C3N4 (X = Cl and Br) nanocomposites via a sonication-assisted deposition-precipitation approach: Emerging role of halide ions in the synergistic photocatalytic reduction of carbon dioxide
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 180, January 2016, Pages 530–543
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us