title: Total mineralization of sulfamethoxazole and aromatic pollutants through Fe2+-montmorillonite catalyzed ozonation.
abstract: The catalytic activity and selectivity of montmorillonite exchanged with Na(+), Fe(2+), Co(2+), Ni(2+) and Cu(2+) cations were comparatively investigated in the ozonation of sulfamethoxazole (SMX). Chlorobenzene, benzoic acid, 4-nitrobenzoic acid, 3-hydroxybenzaldehyde, 4-nitrophenol and phenol were used as probe molecules having structural similarity with SMX oxidation intermediates. UV-vis spectrophometry and chemical oxygen demand (COD) measurements showed that Fe(II)-Mt and, to a lesser extent, Co(II)-Mt produce total mineralization of all organic substrates in less than 40 min. Combined HPLC-mass spectrometry revealed a reverse proportionality between the degradation time and molecular size of the organic substrates. Oxalic acid was recognized as a common bottleneck in the ozonation of any organic substrates. Ozonation initially obeyed a first order kinetics, but adsorption took place after 3-5 min, inducing changes in the mechanisms pathways. These findings may be useful for tailoring optimum oxidative treatment of waters without accumulation of hazardous derivatives.
authors.affiliation: Nanoqam, Department of Chemistry, Université du Québec à Montréal, P.O. Box 8888, Succ. Centre-ville, Québec H3C 3P8, Canada.
authors.forename: Dariush
authors.initials: D
authors.lastname: Shahidi
authors.affiliation: Nanoqam, Department of Chemistry, Université du Québec à Montréal, P.O. Box 8888, Succ. Centre-ville, Québec H3C 3P8, Canada.
authors.forename: Amira
authors.initials: A
authors.lastname: Moheb
authors.affiliation: Nanoqam, Department of Chemistry, Université du Québec à Montréal, P.O. Box 8888, Succ. Centre-ville, Québec H3C 3P8, Canada.
authors.forename: Rabah
authors.initials: R
authors.lastname: Abbas
authors.affiliation: Nanoqam, Department of Chemistry, Université du Québec à Montréal, P.O. Box 8888, Succ. Centre-ville, Québec H3C 3P8, Canada; Laboratory of Sciences and Technologies of Environment, University of Constantine-1, Algeria.
authors.forename: Safa
authors.initials: S
authors.lastname: Larouk
authors.affiliation: Nanoqam, Department of Chemistry, Université du Québec à Montréal, P.O. Box 8888, Succ. Centre-ville, Québec H3C 3P8, Canada.
authors.forename: René
authors.initials: R
authors.lastname: Roy
authors.affiliation: Nanoqam, Department of Chemistry, Université du Québec à Montréal, P.O. Box 8888, Succ. Centre-ville, Québec H3C 3P8, Canada. Electronic address: azzouz.a@uqam.ca.
authors.forename: Abdelkrim
authors.initials: A
authors.lastname: Azzouz
mesh_terms: D000327:Adsorption; D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000302:isolation & purification; D001546:Bentonite / Q000737:chemistry*; D057919:Biological Oxygen Demand Analysis; D002384:Catalysis; D004350:Drug Residues; D006841:Hydrocarbons, Aromatic / Q000737:chemistry* / Q000302:isolation & purification; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D019815:Oxalic Acid / Q000737:chemistry; D010126:Ozone / Q000737:chemistry*; D013420:Sulfamethoxazole / Q000737:chemistry* / Q000302:isolation & purification; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification; D018508:Water Purification
chemical_list: D000900:Anti-Bacterial Agents; D006841:Hydrocarbons, Aromatic; D014874:Water Pollutants, Chemical; D001546:Bentonite; D010126:Ozone; D019815:Oxalic Acid; D007501:Iron; D013420:Sulfamethoxazole