title: Homogeneous iron-catalyzed photochemical degradation of muconic acid in water.
abstract: Iron photochemical oxidation has been used to remove muconic acid from water. Two different light systems were used: black lamps and solar irradiation. The effect of iron concentration, intensity of incident radiation, pH and presence of oxalic acid was investigated. The first two variables yield positive effects on the removal rate of muconic acid while higher efficiency was achieved at pH 3. Oxalic acid enhances the oxidation rate because of the formation of photoactive ferrioxalate ion. Stoichiometric results indicated formation of two hydroxyl radicals to degrade 1 mol of muconic acid. At similar experimental conditions, initial oxidation rates of muconic acid were higher when solar light was used to irradiate the aqueous solutions, although in this case, the oxidation process is stopped because of the consumption of photoactive species.
authors.affiliation: Departamento de Ingeniería Química y Energética, Universidad de Extremadura, Av. Elvas S/N, 06071 Badajoz, Spain.
authors.forename: Eva
authors.initials: E
authors.lastname: Rodríguez
authors.forename: Marta
authors.initials: M
authors.lastname: Mimbrero
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: Masa
authors.forename: Fernando J
authors.initials: FJ
authors.lastname: Beltrán
mesh_terms: D002384:Catalysis; D005290:Ferric Compounds / Q000737:chemistry; D005296:Ferrous Compounds / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D019815:Oxalic Acid / Q000737:chemistry; D010084:Oxidation-Reduction; D010782:Photolysis; D013011:Sorbic Acid / Q000031:analogs & derivatives* / Q000737:chemistry / Q000528:radiation effects; D013472:Sunlight; D014466:Ultraviolet Rays; D018508:Water Purification / Q000379:methods*
chemical_list: D005290:Ferric Compounds; D005296:Ferrous Compounds; C005939:muconic acid; D019815:Oxalic Acid; D007501:Iron; D013011:Sorbic Acid