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Efficiency of TiO2 photocatalytic degradation of HHCB (1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta[γ]-2-benzopyran) in natural aqueous solutions by nested experimental design and mechanism of degradation

Paper ID Volume ID Publish Year Pages File Format Full-Text
47242 46464 2010 7 PDF Available
Title
Efficiency of TiO2 photocatalytic degradation of HHCB (1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta[γ]-2-benzopyran) in natural aqueous solutions by nested experimental design and mechanism of degradation
Abstract

The present paper deals with the photocatalytic transformation of HHCB (1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta[γ]-2-benzopyran, trade name Galaxolide), under simulated solar irradiation using titanium dioxide as a photocatalyst. The investigation has involved a study of HHCB decomposition under a variety of experimental conditions, the identification of intermediate compounds, as well as the assessment of mineralization. A fully nested experimental design was applied to study the effect of various matrices (i.e. distilled water, surface water and wastewater) as well as the initial HHCB concentration on the variation of the photocatalytic efficiency. GC/MS and LC/MS were brought to bear in assessing the temporal course of the photocatalyzed process. A first pathway involves the hydroxylation, that is confined to the benzopyran moiety. Another route proceeds through the detachment of the hexamethylpentacycle moiety, with the formation of the ketoderivative. A parallel transformation involves benzopyran moiety with the ring cleavage. All the identified transformation products are degraded themselves until 2 h of irradiation, while complete mineralization is achieved until 8 h.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights• Nested experimental design approach showed that HHCB photocatalytic efficiency depends on both the aqueous matrix and the initial concentration of the substrate involved. • The benzopyran moiety was involved in hydroxylation and the ring cleavage, while another route proceeds through the detachment of the hexamethylpentacycle moiety, with the formation of the ketoderivative. • The identified compounds are easily degraded within 2 h of irradiation and complete mineralization is accomplished within 8 h.

Keywords
TiO2; Mineralization; Nested design
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Efficiency of TiO2 photocatalytic degradation of HHCB (1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta[γ]-2-benzopyran) in natural aqueous solutions by nested experimental design and mechanism of degradation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 99, Issues 1–2, 31 August 2010, Pages 314–320
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