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Identification of TiO2 photocatalytic destruction byproducts and reaction pathway of cylindrospermopsin

Paper ID Volume ID Publish Year Pages File Format Full-Text
44913 46375 2015 8 PDF Available
Title
Identification of TiO2 photocatalytic destruction byproducts and reaction pathway of cylindrospermopsin
Abstract

•The degradation byproducts of CYN using TiO2 photocatalysis were identified.•The reaction pathways were proposed based on hydroxyl radical chemistry.•Hydroxylation, sulfate elimination and ring opening are main reaction mechanisms.•The photocatalytic treatment can achieve effective detoxification of CYN.

Cylindrospermopsin (CYN) has become a significant environmental concern because of its extremely high toxicity and widespread distribution. TiO2 assisted photocatalytic degradation process has been proven to be effective for CYN degradation. However, the lack of investigation on byproducts and pathways of CYN photocatalytic destruction limited the assessment of this treatment technology (e.g. toxicity of effluent). Therefore, the reaction byproducts and pathways of CYN degradation by TiO2 photocatalysis were studied in this work by using high-performance liquid chromatography combined with quadrupole time-of-flight electrospray ionization tandem mass spectrometry (LC/Q-TOF–ESI–MS). The reaction pathways were proposed and discussed based on the detected byproducts and hydroxyl radical chemistry. The byproducts m/z 432.12 and 448.11 can be formed through hydroxylation by •OH hydrogen abstraction and addition to double bonds. Byproducts without the sulfate group can be generated through a sulfate elimination process. Byproducts (such as m/z 392.12 and 375.10) formed after ring opening by attacks on the hydroxymethyl uracil moiety and tricyclic guanidine moiety were also identified in this study. The detoxification study showed an effective removal of cytotoxicity after TiO2 photocatalytic treatment. This work is important in the proper assessment of the photocatalytic destruction of CYN in water and provides insights that can help determine the level of treatment required by such advanced oxidation technologies.

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Keywords
Byproduct; Cylindrospermopsin; Detoxification; TiO2 photocatalytic degradation; Reaction pathway
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Identification of TiO2 photocatalytic destruction byproducts and reaction pathway of cylindrospermopsin
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 163, February 2015, Pages 591–598
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