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In situ capture of active species and oxidation mechanism of RhB and MB dyes over sunlight-driven Ag/Ag3PO4 plasmonic nanocatalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
46108 46429 2012 8 PDF Available
Title
In situ capture of active species and oxidation mechanism of RhB and MB dyes over sunlight-driven Ag/Ag3PO4 plasmonic nanocatalyst
Abstract

Sunlight-driven Ag/Ag3PO4 plasmonic nanocatalysts have been successfully prepared using an in situ ethylene glycol reduction method. The photocatalysts showed strong photocatalytic activity for decomposition of RhB and MB dyes under visible light irradiation (λ > 420 nm). The excellent photocatalytic performance of Ag/Ag3PO4 came from the sensitivity of Ag3PO4 and the high separation efficiency of electron–hole pairs, which resulted in a large number of holes participating in the photocatalytic oxidation process. The results of density function theory calculation revealed that the visible-light absorption band in the Ag3PO4 catalyst is attributed to the band transition from the hybrid orbital of O 2p and Ag 4d to the Ag 5 s and 5p orbital. The generation of active species in the photocatalytic system was evaluated using the fluorescence (FL) and electron spin resonance (ESR) techniques as well as in situ capture of active species by t-butanol and EDTA. The results indicated that the free hydroxyl radicals were not the major active oxidizing species in the photocatalytic process. The photocatalytic reaction process of the pollutants was mainly governed by the direct oxidation by the holes.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The Ag/Ag3PO4 nanocatalyst was prepared by ethylene glycol reduction method. ► The nanocatalyst possesses excellent photocatalytic activity. ► The photocatalytic reaction was mainly governed by the holes direct oxidation. ► The calculation results clarified the origin of the photocatalytic activity.

Keywords
Photocatalysis; Sunlight; Ag/Ag3PO4; Calculation
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In situ capture of active species and oxidation mechanism of RhB and MB dyes over sunlight-driven Ag/Ag3PO4 plasmonic nanocatalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 125, 21 August 2012, Pages 538–545
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