title: Novel Collimated Beam Setup to Study the Kinetics of VUV-Induced Reactions.
abstract: Vacuum UV (VUV) process is an incipient advanced oxidation process, which can be used for water treatment. This process relies on the formation of hydroxyl radicals through the VUV-induced photolysis of water. In particular, the use of ozone-generating mercury vapor lamps, which emit 10% of the radiation at 185 nm and 90% at 254 nm, is showing very promising results for the degradation of micropollutants. The kinetics of VUV process has been studied in batch- and flow-through reactors, but the effect of 254 and 185 nm photons cannot be isolated, mass transfer resistances can take place and the interpretation of the results is complex. In this technical note, a new VUV collimated beam to conduct kinetic tests is presented, which offers several advantages: (1) it allows the irradiation of samples with 185, 254 nm photons, or both, (2) the concentration of reagents is uniform in the reaction volume and (3) it allows to change the fluence rate by changing the distance between the lamp and the photoreactor. Details of the geometry are presented, as well as an analysis of the collimation and uniformity of the radiation of the new VUV-collimated beam setup.
authors: Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC, Canada.
authors: Clara
authors: C
authors: Duca
authors: Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC, Canada.
authors: Gustavo
authors: G
authors: Imoberdorf
authors: Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC, Canada.
authors: Madjid
authors: M
authors: Mohseni
mesh_terms: D007700:Kinetics; D010084:Oxidation-Reduction; D010782:Photolysis; D014466:Ultraviolet Rays; D014618:Vacuum; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*