title: H(2)O(2)/UV degradation kinetics of isoprene in aqueous solution.
abstract: Hydrogen peroxide and UV radiation have been used in the photochemical degradation of isoprene in aqueous solutions. A kinetic study is carried out taking into account the contribution of the UV radiation reaction and the combined reaction with hydrogen peroxide. An empirical reaction rate expression, which considers the two reactions taking place in parallel, is suggested. Pseudo-first order rate constants are obtained from batch reactor data. As the molar ratio of H(2)O(2):isoprene increases, the rate of reaction increases linearly while the concentration of H(2)O(2) is observed to be nearly constant throughout the reaction; suggesting that the H(2)O(2) acts as a pseudo-catalyst. Nearly complete oxidation of isoprene is achieved. These results indicate that the H(2)O(2)/UV process appears to be a competitive alternative destructive treatment for removing isoprene from water present at low levels.
authors.affiliation: Department of Chemical Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia. elkanzi@fk.um.edu.my
authors.forename: E M
authors.initials: EM
authors.lastname: Elkanzi
authors.forename: G
authors.initials: G
authors.lastname: Bee Kheng
mesh_terms: D002070:Butadienes / Q000737:chemistry* / Q000528:radiation effects; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D045782:Hemiterpenes; D006801:Humans; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007700:Kinetics; D010084:Oxidation-Reduction; D010420:Pentanes; D010777:Photochemistry; D013997:Time Factors; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000528:radiation effects
chemical_list: D002070:Butadienes; D045782:Hemiterpenes; D010420:Pentanes; D014874:Water Pollutants, Chemical; C005059:isoprene; D006861:Hydrogen Peroxide