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Photocatalytic and photoelectrocatalytic degradation of small biological compounds: A case study of uridine

Paper ID Volume ID Publish Year Pages File Format Full-Text
55113 47040 2013 8 PDF Available
Title
Photocatalytic and photoelectrocatalytic degradation of small biological compounds: A case study of uridine
Abstract

Photocatalytic (PC) and photoelectrocatalytic (PEC) degradation of small hazardous biological compounds was accomplished by using uridine as a model compound. The net charge transfer (Qnet) originated from PEC degradation of uridine and blank charge transfer (Qblank) due to photocatalytic oxidation of water remained constant when the light intensity increased from 20 to 40 mW/cm2. The effect of solution pH on Qnet and Qblank showed that the suitable pH range for this proposed analytical application is between 4 and 9. For both PC and PEC, an increase in the uridine concentration within low concentration range led to a rapid decrease in the mineralization percentage for converting organic nitrogens to both NH3/NH4+ and NO3−. With further increase of uridine concentration to 320 μM, the PEC mineralization percentages maintained at about 85% and 56% for N oxidized to NH3 and NO3−, respectively. While for PC treatment, the mineralization percentages decreased steadily. Finally, PC and PEC degradation mechanism of uridine was also clarified on the basis of intermediates identified by HPLC/MS/MS and frontier electron densities calculation. Uridine as well as the intermediates can be eventually mineralized into CO2, H2O and NH3 or NO3− (or both) during PC and PEC degradation with enough reaction time.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (202 K)Download as PowerPoint slideHighlights► PC and PEC mineralization of small biological compound uridine was studied. ► Four intermediates were identified by HPLC/MS/MS. ► Frontier electron densities were calculated to predict the initial reaction sites. ► Degradation mechanism was proposed based on identified intermediates and calculation results.

Keywords
Photocatalysis; Photoelectrocatalysis; Uridine; Degradation mechanism; Mineralization
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 201, 1 March 2013, Pages 167–174
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
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