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Reaction mechanism of visible-light responsive Cu(II)-grafted Mo-doped SrTiO3 photocatalyst studied by means of ESR spectroscopy and chemiluminescence photometry

Paper ID Volume ID Publish Year Pages File Format Full-Text
46516 46440 2012 5 PDF Available
Title
Reaction mechanism of visible-light responsive Cu(II)-grafted Mo-doped SrTiO3 photocatalyst studied by means of ESR spectroscopy and chemiluminescence photometry
Abstract

The reaction mechanisms of visible-light responsive Cu(II)-grafted Mo-doped SrTiO3 (Cu(II)/MoSTO) photocatalyst and related photocatalysts were analyzed by means of ESR spectroscopy for detecting trapped carriers at 77 K and chemiluminescence photometry for O2− and H2O2 in aqueous suspension. On the irradiation of visible light, the reduction of grafted Cu2+ ions was observed by ESR measurements for both Cu(II)/MoSTO and Cu(II)/STO (Cu(II)-grafted undoped SrTiO3) photocatalysts. One electron reduction product for O2, i.e., O2−, was detected in aqueous suspension by 442-nm irradiation for the Cu(II)-grafted samples. On the other hand, the amount of H2O2 detected as the two electron reduction product of O2 was a very small scale, indicating possible further reduction of H2O2 into H2O. From the ESR observations of crystalline defects, it was concluded that the Mo doping to increase visible-light response also increase the electron–hole recombination to some extent, while the Cu(II) grafting functioned as a trap of excited electrons to decrease the recombination.

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Keywords
Visible light responsive photocatalyst; Mo doped SrTiO3; Cu(II) graft; ESR; Superoxide radical
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Reaction mechanism of visible-light responsive Cu(II)-grafted Mo-doped SrTiO3 photocatalyst studied by means of ESR spectroscopy and chemiluminescence photometry
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 111–112, 12 January 2012, Pages 636–640
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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
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Any Questions? feel free to contact us