title: Removal of artificial sweetener aspartame from aqueous media by electrochemical advanced oxidation processes.
abstract: The degradation and mineralization of aspartame (ASP) in aqueous solution were investigated, for the first time, by electrochemical advanced oxidation processes (EAOPs) in which hydroxyl radicals were formed concomitantly in the bulk from Fenton reaction via in situ electrogenerated Fenton's reagent and at the anode surface from the water oxidation. Experiments were performed in an undivided cylindrical glass cell with a carbon-felt cathode and a Pt or boron-doped diamond (BDD) anode. The effect of Fe2+concentration and applied current on the degradation and mineralization kinetics of ASP was evaluated. The absolute rate constant for the reaction between ASP and OH was determined as (5.23 ± 0.02) × 109M-1s-1by using the competition kinetic method. Almost complete mineralization of ASP was achieved with BDD anode at 200 mA constant current electrolysis. The formation and generation of the formed carboxylic acids (as ultimate end products before complete mineralization) and released inorganic ion were monitored by ion-exclusion high performance liquid chromatography (HPLC) and ion chromatography techniques, respectively. The global toxicity of the treated ASP solution during treatment was assessed by the Microtox®method using V. fischeri bacteria luminescence inhibition.
authors.affiliation: Department of Environmental Engineering, Wuhan University, Wuhan 430079, China; Université Paris-Est, Laboratoire Géomatériaux et Environnement (EA 4508), UPEM, 77454, Marne-la-Vallée, France.
authors.forename: Heng
authors.initials: H
authors.lastname: Lin
authors.affiliation: Université Paris-Est, Laboratoire Géomatériaux et Environnement (EA 4508), UPEM, 77454, Marne-la-Vallée, France.
authors.forename: Nihal
authors.initials: N
authors.lastname: Oturan
authors.affiliation: Université Paris-Est, Laboratoire Géomatériaux et Environnement (EA 4508), UPEM, 77454, Marne-la-Vallée, France; Fuzhou Environmental Monitoring Center, Fuzhou 350011, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Wu
authors.affiliation: Department of Environmental and Occupational Health, School of Public Health, Texas A&M University, College Station, TX, 77843, USA.
authors.forename: Virender K
authors.initials: VK
authors.lastname: Sharma
authors.affiliation: Department of Environmental Engineering, Wuhan University, Wuhan 430079, China. Electronic address: eeng@whu.edu.cn.
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Université Paris-Est, Laboratoire Géomatériaux et Environnement (EA 4508), UPEM, 77454, Marne-la-Vallée, France. Electronic address: Mehmet.oturan@univ-paris-est.fr.
authors.forename: Mehmet A
authors.initials: MA
authors.lastname: Oturan
mesh_terms: D001218:Aspartame / Q000032:analysis / Q000302:isolation & purification*; D001895:Boron / Q000737:chemistry; D055664:Electrochemical Techniques / Q000379:methods*; D004572:Electrolysis / Q000379:methods; D006861:Hydrogen Peroxide / Q000737:chemistry; D017665:Hydroxyl Radical / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D007700:Kinetics; D010084:Oxidation-Reduction; D013549:Sweetening Agents / Q000032:analysis / Q000302:isolation & purification*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: C045076:Fenton's reagent; D013549:Sweetening Agents; D014874:Water Pollutants, Chemical; D017665:Hydroxyl Radical; D006861:Hydrogen Peroxide; D007501:Iron; D001895:Boron; D001218:Aspartame
keywords: Artificial sweeteners; Aspartame; Electro-Fenton; Hydroxyl radical; Mineralization; Water treatment