title: Chemical and photochemical degradation of acenaphthylene. Intermediate identification.
abstract: Removal of acenaphthylene from water has been carried out by means of different treatments combining UV radiation, ozone and hydrogen peroxide. Ozonation alone or in conjunction with hydrogen peroxide (10(-3) M) resulted in the highest elimination rates. Thus, conversions as high as 95-100% were obtained in less than 3 min with an ozone dose of 4.1x10(-3) mol O(3) h(-1) (flow rate 2x10(-2) m(3) h(-1)). Slightly lower efficiencies were experienced when using systems containing UV radiation. By considering the kinetics of the direct photolysis of acenaphthylene and the UV/H(2)O(2) system the photochemical reaction quantum yield &phi;(A) (4.0+/-0.1x10(-3) mol/photon) and the rate constant of the reaction of acenaphthylene with the hydroxyl radical k(OH,A) (8.0+/-0.5x10(9) M(-1) s(-1)) were calculated. Intermediates identified by GC/MS were in many cases similar regardless of the oxidation treatment used. Most of these by-products constituted oxygenated species of the parent compound (mainly ketones, aldehydes and carboxylic acids) that further degraded to low molecular, harmless end products.
authors.affiliation: Departamento de Ingeniería Química y Energética, Facultad de Ciencias, Universidad de Extremadura, Av. Elvas S/N, 06071, Badajoz, Spain. fjrivas@unex.es
authors.forename: F J
authors.initials: FJ
authors.lastname: Rivas
authors.forename: F J
authors.initials: FJ
authors.lastname: Beltrán
authors.forename: B
authors.initials: B
authors.lastname: Acedo
mesh_terms: D000073:Acenaphthenes / Q000378:metabolism*; D006861:Hydrogen Peroxide; D007700:Kinetics; D010084:Oxidation-Reduction; D010126:Ozone; D010782:Photolysis; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D000073:Acenaphthenes; D014874:Water Pollutants, Chemical; C042553:acenaphthylene; D010126:Ozone; D006861:Hydrogen Peroxide