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Chemosphere

Title:		Cyclodextrins: a new efficient absorbent to treat waste gas streams
Author(s):		Blach P; Fourmentin S; Landy D; Cazier F; Surpateanu G;
Address:		"Laboratoire de Synthese Organique et Environnement EA2599, Universite du Littoral-Cote d'Opale, 145 Avenue Maurice Schumann, 59140 Dunkerque, France"
Journal Title:		Chemosphere
Year:		2008
Volume:		20070830
Issue:		3
Page Number:		374 - 380
DOI:		10.1016/j.chemosphere.2007.07.018
ISSN/ISBN:		0045-6535 (Print) 0045-6535 (Linking)
Abstract:		"Volatile Organic Compounds (VOCs) in the air provoke health and environmental concerns. This paper focuses on the absorption method to treat industrial polluted air loaded with VOCs. The key variable of this treatment being the choice of a suitable liquid absorbent, the aim of this research work is to investigate the effectiveness and the regeneration of a new potential family of absorbent: cyclodextrins (CDs). All CDs derivatives tested are able to decrease the Henry's law constant of toluene: a reduction of volatility up to 95% may be obtained, depending on CD nature and concentration. Moreover, absorption experiments show that beta-CD, which presents the highest absorption ability, is 250 time more efficient than water. The absorption efficiency is not totally correlated with static experiments, suggesting that, in addition to Henry's law constants and inclusion compounds stability, toluene diffusion into such solutions has to be taken into account. It is also to be noted that salt and pH variations seem to have little influence on the absorption capacity of CDs, which may be of great interest for industrial applications. Finally, since production of solid compounds was not observed during these experiments and since temperature decreases the capture ability in a drastic way, regeneration of the washing solution can be achieved by heating the solution in combination with air stripping"
Keywords:		Adsorption Air Pollutants/*chemistry Air Pollution/*prevention & control Cyclodextrins/*chemistry Industrial Waste/prevention & control Temperature Toluene/*chemistry;
Notes:		"MedlineBlach, Philippe Fourmentin, Sophie Landy, David Cazier, Fabrice Surpateanu, Gheorghe eng Research Support, Non-U.S. Gov't England 2007/09/04 Chemosphere. 2008 Jan; 70(3):374-80. doi: 10.1016/j.chemosphere.2007.07.018. Epub 2007 Aug 30"