title: Assessment of the UV/Cl2advanced oxidation process for the degradation of the emerging contaminants amitriptyline hydrochloride, methyl salicylate and 2-phenoxyethanol in water systems.
abstract: Three emerging contaminants (amitriptyline hydrochloride (AH), methyl salicylate (MS) and 2-phenoxyethanol (PE)) frequently found in wastewaters were selected to be individually degraded in ultra-pure water by the advanced oxidation process (AOP) constituted by the combination of UV radiation and chlorine. The influence of pH, initial chlorine concentration and nature of the contaminants was firstly explored. The trend for the reactivity of the selected compounds was deduced: AH > MS > PE. A later kinetic study was carried out focused on the evaluation of the first-order rate constants and the determination of the partial contribution to the global reaction of the direct photochemical pathway and the radical pathway. In a second stage, the simultaneous oxidation of mixtures of the selected contaminants in several types of water was also performed by the same combination UV/Cl2. The efficiency of this combined system UV/Cl2was compared to other oxidants such as the UV/[Formula: see text] and UV/H2O2AOPs, and the influence of the operating variables was discussed. Results confirmed that the UV/Cl2system provides higher elimination efficiencies among the AOPs tested. The presence of dissolved organic matter and bicarbonate ions in the water matrix caused a decrease in the treatment efficiency.
authors.affiliation: a Departamento de Ingeniería Química y Química Física , Instituto Universitario de Investigación del Agua, Cambio Climático y Sostenibilidad (IACYS), Universidad de Extremadura , Badajoz , Spain.
authors.forename: F
authors.initials: F
authors.lastname: Javier Benitez
authors.affiliation: a Departamento de Ingeniería Química y Química Física , Instituto Universitario de Investigación del Agua, Cambio Climático y Sostenibilidad (IACYS), Universidad de Extremadura , Badajoz , Spain.
authors.forename: Francisco J
authors.identifier: http://orcid.org/0000-0002-2305-4840
authors.initials: FJ
authors.lastname: Real
authors.affiliation: a Departamento de Ingeniería Química y Química Física , Instituto Universitario de Investigación del Agua, Cambio Climático y Sostenibilidad (IACYS), Universidad de Extremadura , Badajoz , Spain.
authors.forename: Juan L
authors.identifier: http://orcid.org/0000-0003-3611-4811
authors.initials: JL
authors.lastname: Acero
authors.affiliation: a Departamento de Ingeniería Química y Química Física , Instituto Universitario de Investigación del Agua, Cambio Climático y Sostenibilidad (IACYS), Universidad de Extremadura , Badajoz , Spain.
authors.forename: Francisco
authors.identifier: http://orcid.org/0000-0003-3826-9227
authors.initials: F
authors.lastname: Casas
mesh_terms: D000639:Amitriptyline / Q000737:chemistry*; D005026:Ethylene Glycols / Q000737:chemistry*; D006861:Hydrogen Peroxide; D010084:Oxidation-Reduction; D012459:Salicylates / Q000737:chemistry*; D014466:Ultraviolet Rays; D014867:Water; D014874:Water Pollutants, Chemical; D018508:Water Purification / Q000379:methods*
chemical_list: D005026:Ethylene Glycols; D012459:Salicylates; D014874:Water Pollutants, Chemical; D014867:Water; D000639:Amitriptyline; D006861:Hydrogen Peroxide; C005398:phenoxyethanol; C033069:methyl salicylate
keywords: 2-phenoxyethanol; Emerging contaminants; UV/chlorine advanced oxidation process; amitriptyline; chlorination; methyl salicylate; photolysis; rate constants