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Photo-assisted synthesis of Ag3PO4/reduced graphene oxide/Ag heterostructure photocatalyst with enhanced photocatalytic activity and stability under visible light

Paper ID Volume ID Publish Year Pages File Format Full-Text
45866 46426 2014 11 PDF Available
Title
Photo-assisted synthesis of Ag3PO4/reduced graphene oxide/Ag heterostructure photocatalyst with enhanced photocatalytic activity and stability under visible light
Abstract

•Ag3PO4/RGO/Ag photocatalysts were prepared by a photo-assisted reduction method.•Ag3PO4/RGO/Ag exhibit superior photocatalytic activity and stability.•Synergistic effect of RGO and Ag on the photocatalytic performance of Ag3PO4/RGO/Ag was studied.•RGO/Ag enhanced photo-generated charges separation and transfer in Ag3PO4/RGO/Ag.•Plasmonic Ag generated active electrons via surface plasmon resonance for photocatalysis.

A novel Ag3PO4/reduced graphene oxide/Ag nanocrystals (Ag3PO4/RGO/Ag) heterostructure photocatalyst has been synthesized using a facile photo-assisted reduction method for the first time. The Ag3PO4/RGO/Ag that consists of close chemical bonding between RGO and Ag3PO4 nanoparticles as well as dispersive plasmonic Ag nanocrystals on the RGO sheets exhibited superior photocatalytic activity and stability to bare Ag3PO4, Ag/Ag3PO4 and Ag3PO4/GO in degradation of Rhodamine B and phenol under visible light. It is suggested that the photo-generated electrons in Ag3PO4 can be transferred to RGO/Ag, leading to efficient separation and transfer of electron–hole pairs. Meanwhile, under light irradiation, the plasmonic Ag nanocrystals also generate electron–hole pairs through surface plasmon resonance (SPR), in which the active electrons can facilitate the formation of additional active species of O2•− for photocatalysis whereas the holes can be filled by electrons from RGO. As a result, both the photocorrosion of Ag3PO4 and the recombination of electron–hole pairs are suppressed due to the special electron transfer route of Ag3PO4 → RGO → Ag in the heterostructure. This work suggests that the reasonable combination of semiconductors and graphene decorated with noble metallic nanocrystals can provide a versatile strategy for the synthesis of high efficient heterostructed photocatalysts.

Graphical abstractA heterostructured Ag3PO4/RGO/Ag visible-light-driven photocatalyst has been synthesized by a facial photo-assisted reduction method. The Ag3PO4/RGO/Ag that consists of close chemical bonding between RGO and Ag3PO4 nanoparticles as well as dispersive plasmonic Ag nanocrystals on the RGO sheets exhibited superior photocatalytic activity and stability to bare Ag3PO4, Ag/Ag3PO4 and Ag3PO4/GO in degradation of Rhodamine B and phenol under visible light. It is suggested that the photo-generated electrons in Ag3PO4 can be transferred to RGO/Ag, leading to efficient separation and transfer of electron–hole pairs. Meanwhile, under light irradiation, the plasmonic Ag nanocrystals also generate electron–hole pairs through surface plasmon resonance (SPR), in which the active electrons can facilitate the formation of additional active species of O2•− for photocatalysis whereas the holes can be filled by electrons from RGO. As a result, both the photocorrosion of Ag3PO4 and the recombination of electron–hole pairs are suppressed due to the special electron transfer route of Ag3PO4 → RGO → Ag in the heterostructure. This work suggests that the reasonable combination of semiconductors and graphene decorated with noble metallic nanocrystals can provide a versatile strategy for the synthesis of high efficient heterostructed photocatalysts.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Ag3PO4; Reduced graphene oxide; Ag nanocrystals; Visible-light-driven photocatalyst
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Photo-assisted synthesis of Ag3PO4/reduced graphene oxide/Ag heterostructure photocatalyst with enhanced photocatalytic activity and stability under visible light
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 158–159, October 2014, Pages 150–160
Authors
, , , , , , , , , ,
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