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TiO2/H2O2 mediated photocatalytic transformation of UV filter 4-methylbenzylidene camphor (4-MBC) in aqueous phase: Statistical optimization and photoproduct analysis

Paper ID Volume ID Publish Year Pages File Format Full-Text
47661 46479 2009 9 PDF Available
Title
TiO2/H2O2 mediated photocatalytic transformation of UV filter 4-methylbenzylidene camphor (4-MBC) in aqueous phase: Statistical optimization and photoproduct analysis
Abstract

Central composite design (CCD) based on response surface methodology (RSM) was employed in the present study in combination with “profiling and desirability function” to evaluate the effects of main variables (TiO2, H2O2, and light intensity) affecting 4-methylbenzylidene camphor (4-MBC) photocatalytic degradation and for optimization of the process.Besides statistical optimization of the UV filter decomposition, the investigation involved a study of the identification of intermediate compounds, mineralization, as well as toxicity evaluation. The transformation of 4-MBC proceeds through: (i) demethylation of the bridged structure; (ii) hydroxylation of the methylbenzylidene moiety; (iii) bihydroxylation/demethylation reaction. Even if all the identified compounds are degraded themselves within 30 min, the complete carbon mineralization is only achieved after 24 h of irradiation. Toxicity assays using Vibrio fischeri, have shown that 4-MBC intermediates exhibit acute toxicity.

Keywords
Photocatalysis; TiO2; Experimental design; Mineralization; Toxicity; UV filter
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TiO2/H2O2 mediated photocatalytic transformation of UV filter 4-methylbenzylidene camphor (4-MBC) in aqueous phase: Statistical optimization and photoproduct analysis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 90, Issues 3–4, 17 August 2009, Pages 526–534
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