title: Photo-Fenton degradation of phenol, 2,4-dichlorophenoxyacetic acid and 2,4-dichlorophenol mixture in saline solution using a falling-film solar reactor.
abstract: In this work, a saline aqueous solution of phenol, 2,4-dichlorophenoxyacetic acid (2,4-D) and 2,4-dichlorophenol (2,4-DCP) was treated by the photo-Fenton process in a falling-film solar reactor. The influence of the parameters such as initial pH (5-7), initial concentration of Fe2+ (1-2.5mM) and rate of H202 addition (1.87-3.74mmol min-1) was investigated. The efficiency of photodegradation was determined from the removal of dissolved organic carbon (DOC), described by the species degradation of phenol, 2,4-D and 2,4-DCP. Response surface methodology was employed to assess the effects of the variables investigated, i.e. [Fe2+], [H202] and pH, in the photo-Fenton process with solar irradiation. The results reveal that the variables' initial concentration of Fe2+ and H202 presents predominant effect on pollutants' degradation in terms of DOC removal, while pH showed no influence. Under the most adequate experimental conditions, about 85% DOC removal was obtained in 180 min by using a reaction system employed here, and total removal of phenol, 2,4- and 2,4-DCP mixture in about 30min.
authors.affiliation: National Institute of lndustrial Property, Rio de Janeiro 20090-910, Brazil.
authors.forename: Airton J
authors.initials: AJ
authors.lastname: Luna
authors.affiliation: Department of Chemical Engineering, University of São Paulo, São Paulo 05508-900, Brazil.
authors.forename: Cláudio A O
authors.initials: CA
authors.lastname: Nascimento
authors.affiliation: Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria 97105-900, Brazil.
authors.forename: Edson Luiz
authors.initials: EL
authors.lastname: Foletto
authors.affiliation: Department of Chemical Engineering, Federal University of São Paulo, São Paulo 09972-270, Brazil.
authors.forename: José E F
authors.initials: JE
authors.lastname: Moraes
authors.affiliation: Department of Chemical Engineering, Federal University of Rio Grande do Norte, Natal 59066-800, Brazil.
authors.forename: Osvaldo
authors.initials: O
authors.lastname: Chiavone-Filhoe
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000737:chemistry* / Q000302:isolation & purification / Q000528:radiation effects; D045424:Complex Mixtures / Q000737:chemistry / Q000302:isolation & purification / Q000528:radiation effects; D011211:Electric Power Supplies; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006861:Hydrogen Peroxide / Q000737:chemistry* / Q000528:radiation effects; D007501:Iron / Q000737:chemistry* / Q000528:radiation effects; D010636:Phenols / Q000737:chemistry* / Q000302:isolation & purification / Q000528:radiation effects; D010777:Photochemistry / Q000295:instrumentation* / Q000379:methods; D012965:Sodium Chloride / Q000737:chemistry* / Q000528:radiation effects; D012993:Solar Energy; D018508:Water Purification / Q000295:instrumentation*
chemical_list: D045424:Complex Mixtures; C045076:Fenton's reagent; D010636:Phenols; D015084:2,4-Dichlorophenoxyacetic Acid; D012965:Sodium Chloride; D006861:Hydrogen Peroxide; D007501:Iron