Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 190, Issue 1, Pages 135-140Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2007.03.022
Keywords
optical fiber reactor; TiO2; photocatalytic; malic acid; photonic efficiency
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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 x 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 a-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. (c) 2007 Elsevier B.V. All rights reserved.
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