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TiO2 photocatalysis of 2-isopropyl-3-methoxy pyrazine taste and odor compound in aqueous phase: Kinetics, degradation pathways and toxicity evaluation

Paper ID Volume ID Publish Year Pages File Format Full-Text
54423 47009 2015 8 PDF Available
Title
TiO2 photocatalysis of 2-isopropyl-3-methoxy pyrazine taste and odor compound in aqueous phase: Kinetics, degradation pathways and toxicity evaluation
Abstract

•The photocatalytic degradation of IPMP in aqueous solution was investigated in detail.•Eleven intermediates identified using HR-LC–MS and GC–MS techniques.•Photogenerated •OH radicals were principally responsible for the degradation of IPMP.•Almost total detoxification of the irradiated solution after 300 min.

In recognition of the growing demand regarding the control of undesired taste and odor (T&O) problems in natural water resources, the photocatalytic degradation of 2-isopropyl-3 methoxy pyrazine (IPMP), a common metabolite of soil actinomycetes which contributes a rotten vegetable odor to water, was investigated under simulated solar irradiation. Under the studied conditions (C = 10 mg L−1, CTiO2=100 mg L−1CTiO2=100 mg L−1 and I = 600 W m−2), 95% of IPMP was removed within 20 min of irradiation. The reaction intermediates were completely mineralized to CO2 and the nitrogen was predominantly released as NH4+ ions after 240 min irradiation. The major transformation products of TiO2 photocatalysis of IPMP have been determined by the use of high resolution accurate liquid chromatography–orbitrap mass spectrometry as well as gas chromatography–mass spectrometry (GC–MS) techniques. Hydroxylation of the isopropyl and methoxy groups has been identified as the main reaction pathway. Scavenging experiments indicated the important role of HO•, h+ and O2•− in the photocatalytic process. Toxicity assessment revealed the efficiency of the photocatalytic treatment to achieve almost complete detoxification of the irradiated solution.

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Keywords
Taste and odor; TiO2; Photocatalysis; Transformation products; Scavengers
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TiO2 photocatalysis of 2-isopropyl-3-methoxy pyrazine taste and odor compound in aqueous phase: Kinetics, degradation pathways and toxicity evaluation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 240, Part A, 1 February 2015, Pages 22–29
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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Any Questions? feel free to contact us