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New insight of Ag quantum dots with the improved molecular oxygen activation ability for photocatalytic applications

Paper ID Volume ID Publish Year Pages File Format Full-Text
45030 46393 2016 12 PDF Available
Title
New insight of Ag quantum dots with the improved molecular oxygen activation ability for photocatalytic applications
Abstract

•Ag quantum dots (Ag QDs) modified BiOBr ultrathin nanosheets have been prepared.•The Ag QDs/BiOBr materials displayed enhanced photocatalytic activity for the degradation of CIP and TC.•The modified Ag QDs could active the molecular oxygen via the hot electron reduction under the visible light irradiation.

Ag quantum dots (Ag QDs) modified BiOBr ultrathin nanosheets have been prepared via the reactable ionic liquid assisted solvothermal method. The Ag QDs was evenly dispersed on the surface of BiOBr nanosheets with the diameter less than 5 nm. The obtained Ag QDs/BiOBr materials displayed greatly enhanced photocatalytic activity for the degradation of antibiotic agent ciprofloxacin (CIP) and tetracycline hydrochloride (TC) under visible light irradiation. Through the various characterizations, the relationship between structure and activity was studied in details and some new insights of the key role of Ag QDs for the enhanced photocatalytic activity was presented. Different from the roles previous reported such as electron injection, plasmon resonance energy transfer and Schottky junction, the modified Ag QDs could active the molecular oxygen via the hot electron reduction under the visible light irradiation in this system. And the Ag QDs worked as adsorption centers, charge separation centers and photocatalytic reaction centers, contributed to the increased photocatalytic activity. This study provided an approach to improve the molecular oxygen activation for pollutant removal, selective organic synthesis or donating abundant hot electrons for CO2 photoredution.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideAg quantum dots (Ag QDs) modified BiOBr ultrathin nanosheets have been prepared. The modified Ag QDs could active the molecular oxygen via the hot electron reduction under the visible light irradiation.

Keywords
Ag; BiOBr; Molecular oxygen activation; Hot electron; Photocatalytic
First Page Preview
New insight of Ag quantum dots with the improved molecular oxygen activation ability for photocatalytic applications
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 188, 5 July 2016, Pages 376–387
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis