title: An innovative ultrasound, Fe(2+) and TiO(2) photoassisted process for bisphenol A mineralization.
abstract: This paper explores the degradation of a model pollutant, bisphenol A, by an advanced oxidation process that combines sonolysis, Fe(2+), and TiO(2) in a photoassisted process. Experiments were done under saturated oxygen conditions. The effect of different Fe(2+) (0.56 and 5.6 mg/L) and TiO(2) (10 and 50 mg/L) concentrations was investigated on both the elimination and mineralization of the pollutant. A pronounced synergistic effect that led to the complete and rapid elimination of dissolved organic carbon (DOC) was observed even at low catalyst loadings. In this system, almost a complete removal of DOC (93%) was observed after 4 h using 10 and 5.6 mg/L of TiO(2) and Fe(2+), respectively, whereas at the same time, only 5, 6, and 22% of DOC was removed by an individual process alone (TiO(2) photocatalysis, ultrasound, and photo-Fenton, respectively). In this system, ultrasound has the principal role of eliminating the initial substrate and providing hydrogen peroxide for the photocatalytic systems, while photo-Fenton and TiO(2) photocatalysis are mainly responsible for the transformation of the intermediates in CO(2) and H(2)O. The role of H(2)O(2) generated from the sonochemical process is also discussed.
authors.affiliation: Grupo de Electroquímica, Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, A. A. 1226, Medellín, Colombia.
authors.forename: Ricardo A
authors.initials: RA
authors.lastname: Torres-Palma
authors.forename: Jessica I
authors.initials: JI
authors.lastname: Nieto
authors.forename: Evelyne
authors.initials: E
authors.lastname: Combet
authors.forename: Christian
authors.initials: C
authors.lastname: Pétrier
authors.forename: Cesar
authors.initials: C
authors.lastname: Pulgarin
mesh_terms: D001559:Benzhydryl Compounds; D002384:Catalysis / Q000528:radiation effects; D005296:Ferrous Compounds / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D010084:Oxidation-Reduction / Q000528:radiation effects; D010636:Phenols / Q000737:chemistry*; D055668:Photochemical Processes; D014025:Titanium / Q000737:chemistry*; D014465:Ultrasonics; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D005296:Ferrous Compounds; D006861:Hydrogen Peroxide; D007501:Iron; D010636:Phenols; D014025:Titanium; D014874:Water Pollutants, Chemical; C045076:Fenton's reagent; C009495:titanium dioxide; C034236:ferrous oxide; C006780:bisphenol A; D000098826:Bisphenol A Compounds