Co-treatment of industrial air streams using A.O.P. and adsorption processes

Co-treatment of industrial air streams using A.O.P. and adsorption processes

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Coupling adsorption with two different photochemical oxidation methods was investigated, in order to treat industrial gaseous effluents containing a low concentration of Volatile Organic Compounds (VOC).Prior to adsorption/photocatalysis cyclic study, new TiO2 based catalysts were prepared by impregnating commercial zeolites in pellets form using Glycine a sol-gel technique.Scanning Electronic Microscopy observations linked to BET and adsorption equilibrium measurements of two VOC (1-butanol or BuOH and methyl-ethyl-ketone or MEK) showed that TiO2 happened to fix on the inert binder, without significant modification of support properties.A specific diffusion cell was used to produce dilute polluted air streams for each VOC in dynamic experiments, in which adsorption and photodegradation phases were alternatively carried out.Adsorption/photocatalysis co-treatment unable the total degradation of BuOH, and the regeneration of adsorbent.

When using V-UV photolysis, pure Basket zeolites were used, irradiated at 172 nm with an xenon excimer lamp.Excellent results were observed, since a total and rapid degradation was obtained for both VOC, especially thanks to a determining role of ozone.