fulltext.study @t Gmail

Study on the separation mechanisms of photogenerated electrons and holes for composite photocatalysts g-C3N4-WO3

Paper ID Volume ID Publish Year Pages File Format Full-Text
45964 46427 2014 10 PDF Available
Title
Study on the separation mechanisms of photogenerated electrons and holes for composite photocatalysts g-C3N4-WO3
Abstract

•g-C3N4-WO3 photocatalysts with different main parts of C3N4 or WO3 were prepared.•The band–band transfer for g-C3N4/WO3 and the Z-scheme for WO3/g-C3N4 were proposed.•The activity of g-C3N4/WO3 is not obviously increased compared with pure WO3.•The activity of WO3/g-C3N4 is increased greatly compared with pure g-C3N4.

The separation mechanisms of photogenerated electrons and holes for composite photocatalysts have been a research focus. In this paper, the composite g-C3N4-WO3 photocatalysts with different main parts of C3N4 or WO3 were prepared by ball milling and heat treatment methods. The photocatalytic performance was evaluated by degradation of methylene blue (MB) and fuchsin (BF) under visible light illumination. The photocatalyst was characterized by X-ray powder diffraction (XRD), UV–vis diffuse reflection spectroscopy (DRS), transmission electron microscopy (TEM) and Brunauer–Emmett–Teller (BET) methods. The separation mechanisms of photogenerated electrons and holes of the g-C3N4-WO3 photocatalysts were investigated by electron spin resonance technology (ESR), photoluminescence technique (PL), and determination of reactive species in the photocatalytic reactions. When the main part of the g-C3N4-WO3 photocatalyst is WO3 (namely g-C3N4/WO3), the transport process of the photogenerated electrons and holes adopts the generic band–band transfer. Meanwhile, g-C3N4 is covered by WO3 powder, and the role of g-C3N4 can not be played fully. The photocatalytic activity of the photocatalyst is not obviously increased. However, when the primary part of the WO3-g-C3N4 photocatalyst is g-C3N4 (namely WO3/g-C3N4), the migration of photogenerated electrons and holes exhibits a typical characteristic of Z-scheme photocatalyst, and the photocatalytic activity of the photocatalyst is increased greatly.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Composite photocatalyst; g-C3N4-WO3; Photoexcited carriers; Transport process; Reaction mechanisms
First Page Preview
Study on the separation mechanisms of photogenerated electrons and holes for composite photocatalysts g-C3N4-WO3
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 150–151, 5 May 2014, Pages 564–573
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