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Photocatalytic destruction of air pollutants with vacuum ultraviolet (VUV) irradiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
55756 47063 2011 6 PDF Available
Title
Photocatalytic destruction of air pollutants with vacuum ultraviolet (VUV) irradiation
Abstract

Photocatalysis with vacuum ultraviolet (VUV) irradiation (VUV–PCO) was utilized to destroy air pollutants. Escherichia coli (E. coli) and toluene were chosen as the target pollutants. Two parallel reactions with 254 nm UV irradiation (254 nm-PCO) and without TiO2 (i.e. VUV photolysis) were also conducted for comparison. Results indicate that VUV–PCO process has a higher efficiency in destroying toluene and inactivating E. coli. In addition, the stability of PCO activity is increased while the byproducts yield is lowered during toluene destruction in the VUV–PCO process. Toluene removal efficiency (TRE) in the VUV–PCO process was more than 5 times higher than that in the 254 nm-PCO process. VUV–PCO overcomes some drawbacks of conventional photocatalysis, such as low efficiency and easy photocatalyst deactivation. The destroying mechanism of air pollutants in the VUV–PCO process is greatly different from that of the 254 nm-PCO process. The excellent performance of VUV–PCO system may be attributed to the more reaction processes (such as VUV photolysis and catalytic ozonation) and more reactive species (such as active oxygen and hydroxyl radicals) formed to destroy the pollutants.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (267 K)Download as PowerPoint slideHighlights► A VUV lamp was used to activate photocatalyts for destroying air pollutants. ► VUV–PCO has a high efficiency in destroying toluene and inactivating Escherichia coli. ► The photocatalytic stability is greatly increased in the VUV–PCO. ► The byproducts yield is significantly lowered in the VUV–PCO. ► Excellent performance of VUV–PCO is due to many reaction processes.

Keywords
Vacuum ultraviolet irradiation; Photocatalysis; Toluene; Escherichia coli; Air pollutants; Byproducts
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Photocatalytic destruction of air pollutants with vacuum ultraviolet (VUV) irradiation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 175, Issue 1, 25 October 2011, Pages 310–315
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