title: Mechanism of O2-accelerated sonolysis of bisphenol A.
abstract: The effects of dissolved gases on the sonochemical degradation of bisphenol A (BPA) were studied at a frequency of 500 kHz. BPA degradation rate increased in the order O(2)>Ar>air>N(2). The rate constant for oxygen (2.6 h(-1)) was approximately two fold higher than that for argon (1.2 h(-1)). A primary intermediate (2,3-dihydro-2-methylbenzofuran), a typical intermediate of BPA formed during attack by OH radicals, was detected only in the presence of oxygen, revealing that a different reaction path was responsible for the enhancement of decomposition.
authors.affiliation: Department of Applied Physics and Chemistry, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Kitajima
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Hatanaka
authors.forename: Shigeo
authors.initials: S
authors.lastname: Hayashi
mesh_terms: D001559:Benzhydryl Compounds; D005740:Gases / Q000737:chemistry / Q000302:isolation & purification / Q000528:radiation effects; D008956:Models, Chemical; D010100:Oxygen / Q000737:chemistry* / Q000528:radiation effects; D010636:Phenols / Q000737:chemistry* / Q000302:isolation & purification / Q000528:radiation effects*; D013010:Sonication; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification / Q000528:radiation effects*; D018508:Water Purification / Q000379:methods; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D005740:Gases; D010100:Oxygen; D010636:Phenols; D014867:Water; D014874:Water Pollutants, Chemical; C006780:bisphenol A; D000098826:Bisphenol A Compounds