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Malic acid photocatalytic degradation using a TiO2-coated optical fiber reactor

Paper ID Volume ID Publish Year Pages File Format Full-Text
28154 44061 2007 6 PDF Available
Title
Malic acid photocatalytic degradation using a TiO2-coated optical fiber reactor
Abstract

A photoreactor containing a bundle of TiO2-coated optical fibers was employed for the photocatalytic degradation of malic acid, a polycarboxylic acid found in fermentation processes and in biomass. TiO2 film was coated on optical fiber using a dip-coating method. The kinetic behavior of malic acid conversion in this study was found to follow a first-order kinetics with a degradation rate of 6.8 × 10−2 h−1. Laboratory experiments enabled one to detect six intermediates presented in five degradation pathways. Their evolution during the photocatalytic reaction was also investigated. The major one, malonic acid, is initiated by a decarboxylation (“photo-Kolbe”) reaction in the α-position with respect to the OH group followed by an OH addition. The others intermediates come from the same process or from H-abstraction or oxidation. The total organic carbon removal after 20 h of treatment was 21%.A high photonic efficiency of 6% was achieved for experiments operated in the optical fiber photoreactor due to the optimized light utilization.

Keywords
Optical fiber reactor; TiO2; Photocatalytic; Malic acid; Photonic efficiency
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 190, Issue 1, 5 July 2007, Pages 135–140
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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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