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Chemosphere

Title:		Intensification of volatile organic compounds mass transfer in a compact scrubber using the O3/H2O2 advanced oxidation process: kinetic study and hydroxyl radical tracking
Author(s):		Biard PF; Couvert A; Renner C; Levasseur JP;
Address:		"Ecole Nationale Superieure de Chimie de Rennes, CNRS, UMR 6226, Avenue du General Leclerc, Rennes Cedex 7, France. pierre-francois.biard@ensc-rennes.fr"
Journal Title:		Chemosphere
Year:		2011
Volume:		20110830
Issue:		7
Page Number:		1122 - 1129
DOI:		10.1016/j.chemosphere.2011.07.050
ISSN/ISBN:		1879-1298 (Electronic) 0045-6535 (Linking)
Abstract:		"This study assesses the potential of ozonation and advanced oxidation process O(3)/H(2)O(2) to enhance the dimethyldisulfide (DMDS) mass transfer in a compact chemical scrubber developed for air treatment applications. Theoretical calculations, through Hatta number and enhancement factor evaluations for two parallel irreversible reactions, were compared to experimental data and enabled the description of the mass transfer mechanisms. These calculations required the determination of the kinetic constant of the DMDS oxidation by molecular ozone ( [Formula: see text] ) and the measurement of the hydroxyl radical concentration within the scrubber. The competitive kinetic method using the 1,2-dihydroxybenzene (resorcinol) enabled to determine a value of the kinetic constant [Formula: see text] of 1.1x10(6)M(-1)s(-1) at 293K. Then, experiments using para-chlorobenzoic acid in solution allowed measuring the average hydroxyl concentration in the scrubber between the inlet and the outlet depending on the chemical conditions (pH and inlet O(3) and H(2)O(2) concentrations). High hydroxyl radical concentrations (10(-8)M) and ratio of the HO degrees -to-O(3) exposure (R(ct) approximately 10(-4)) were put in evidence"
Keywords:		"Air Pollutants/*chemistry Chlorobenzoates/chemistry Disulfides/chemistry Hydrogen Peroxide/*chemistry Hydrogen-Ion Concentration Hydroxyl Radical/*chemistry Kinetics Models, Theoretical Oxidation-Reduction Ozone/*chemistry Resorcinols/chemistry Volatile O;"
Notes:		"MedlineBiard, Pierre-Francois Couvert, Annabelle Renner, Christophe Levasseur, Jean-Pierre eng England 2011/09/02 Chemosphere. 2011 Nov; 85(7):1122-9. doi: 10.1016/j.chemosphere.2011.07.050. Epub 2011 Aug 30"