fulltext.study @t Gmail

Efficient visible light-induced photocatalytic degradation of methyl orange by QDs sensitized CdS-Bi2WO6

Paper ID Volume ID Publish Year Pages File Format Full-Text
46748 46447 2011 9 PDF Available
Title
Efficient visible light-induced photocatalytic degradation of methyl orange by QDs sensitized CdS-Bi2WO6
Abstract

Photocatalytic active Bi2WO6 sensitized by CdS quantum dots (QDs) was synthesized via a chemical hydrothermal approach for the first time. The QDs sensitized CdS-Bi2WO6 photocatalysts were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV–vis absorption spectroscopy (UV–vis) and photoluminescence spectra (PL). The photocatalytic activities of QDs sensitized CdS-Bi2WO6 samples were investigated based on the decomposition of methyl orange and phenol in aqueous solution under visible light irradiation (λ > 420 nm). The DRS results revealed that CdS-Bi2WO6 samples have a red shift and stronger absorption in the visible light region. After being sensitized by CdS QDs, the Bi2WO6 samples showed the high efficiency for the degradation of methyl orange. The enhanced photocatalytic performance could be attributed to the synergic effect between CdS QDs and Bi2WO6, which promoted the migration efficiency of photo-generated carriers. According to experimental results, the possible photocatalytic mechanism of the CdS-Bi2WO6 photocatalyst was proposed in order to guide the further improvement of its photocatalytic activity.

Graphical abstractNovel quantum dots (QDs) sensitized CdS-Bi2WO6 photocatalysts were prepared by chemical hydrothermal approach for the first time. The DRS results revealed that CdS-Bi2WO6 samples have a red shift and stronger absorption in the visible light region. After being sensitized by CdS QDs, the Bi2WO6 samples showed the high efficiency for the degradation of methyl orange. The enhanced photocatalytic performance could be attributed to the synergic effect between CdS QDs and Bi2WO6, which promoted the migration efficiency of photo-generated carriers.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The novel CdS QDs sensitized Bi2WO6 photocatalyst were prepared for the first time. ► The CdS-Bi2WO6 composites showed enhanced photocatalytic activity. ► The arrangement of CdS QDs on the surface of Bi2WO6 was revealed by HRTEM. ► Photodegraded mechanism of CdS-Bi2WO6 was proposed based on energy band positions. ► The mechanism was confirmed by PL spectra and photocatalytic results.

Keywords
Quantum dots; Photocatalysis; CdS-Bi2WO6; Functional; Semiconductors
First Page Preview
Efficient visible light-induced photocatalytic degradation of methyl orange by QDs sensitized CdS-Bi2WO6
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 - Volume 105, Issues 3–4, 22 June 2011, Pages 289–297
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