title: Enhanced sonochemical degradation of bisphenol-A by bicarbonate ions.
abstract: Sonochemical elimination of organic pollutants can take place through two degradation pathways. Molecules with relatively large Henry's law constants will be incinerated inside the cavitation bubble, while nonvolatile molecules with low Henry's law constants will be oxidised by the OH(*) ejected from the bubble of cavitation. Taking bisphenol-A as a model pollutant, this study points out an alternate degradation route, mediated by bicarbonate ions, which is significant for the elimination of micro-pollutants at concentrations present in natural waters. In this process, OH(*) radicals react with bicarbonate ions to produce the carbonate radical, which, unlike the OH(*) radical, can migrate towards the bulk of the solution and therefore induce the degradation of the micro-pollutants present in the bulk solution. As a consequence, initial degradation rate is increased by a factor 3.2 at low concentration of bisphenol-A (0.022 micromol l(-1)) in presence of bicarbonate in water.
authors.affiliation: LEPMI, Université Joseph Fourier, BP 75, 38402 Grenoble, France. christian.petrier@lepmi.inpg.fr
authors.forename: Christian
authors.initials: C
authors.lastname: Pétrier
authors.forename: Ricardo
authors.initials: R
authors.lastname: Torres-Palma
authors.forename: Evelyne
authors.initials: E
authors.lastname: Combet
authors.forename: Georgios
authors.initials: G
authors.lastname: Sarantakos
authors.forename: Stéphane
authors.initials: S
authors.lastname: Baup
authors.forename: César
authors.initials: C
authors.lastname: Pulgarin
mesh_terms: D000395:Air Pollutants, Occupational / Q000737:chemistry* / Q000528:radiation effects*; D001559:Benzhydryl Compounds; D001639:Bicarbonates / Q000737:chemistry* / Q000528:radiation effects*; D003198:Computer Simulation; D008956:Models, Chemical; D010636:Phenols / Q000737:chemistry* / Q000528:radiation effects*; D011829:Radiation Dosage; D013010:Sonication / Q000379:methods*; D000098826:Bisphenol A Compounds
chemical_list: D000395:Air Pollutants, Occupational; D001559:Benzhydryl Compounds; D001639:Bicarbonates; D010636:Phenols; C006780:bisphenol A; D000098826:Bisphenol A Compounds