title: Degradation pathways of aniline in aqueous solutions during electro-oxidation with BDD electrodes and UV/H2O2treatment.
abstract: In this work, it has been studied the mineralization of aniline, a toxic substance of low biodegradability typically found in many industrial wastewaters, through electro-oxidation using boron doped diamond (BDD) electrodes and photo-oxidation (UV photolysis and UV/H2O2treatments). It was observed that in electro-oxidation and UV/H2O2, it was feasible to reach aniline mineralizations higher than 85%. Two different degradation routes have been observed during the aniline oxidation in these two treatments. The first route was the mineralization pathway, in which aniline was oxidized to CO2, water and nitrate. The second route was the polyaniline pathway in which polyanilines of high molecular weight are formed. The intermediate compounds involved in both degradation routes are different depending on the treatment used. In the electro-oxidation, denitrification processes were also observed. From an economical point of view, electro-oxidation of aniline using BDD electrodes is more interesting than UV/H2O2due it has an 87% lower operational cost. So, electro-oxidation using BDD electrodes seems to be a more suitable technique for the mineralization of wastewater containing aniline than UV or H2O2based technologies.
authors.affiliation: IQS School of Engineering, Universitat Ramon Llull, Via Augusta 390, 08017, Barcelona, Spain.
authors.forename: Aleix
authors.initials: A
authors.lastname: Benito
authors.affiliation: IQS School of Engineering, Universitat Ramon Llull, Via Augusta 390, 08017, Barcelona, Spain.
authors.forename: Aida
authors.initials: A
authors.lastname: Penadés
authors.affiliation: IQS School of Engineering, Universitat Ramon Llull, Via Augusta 390, 08017, Barcelona, Spain.
authors.forename: Josep Lluis
authors.initials: JL
authors.lastname: Lliberia
authors.affiliation: IQS School of Engineering, Universitat Ramon Llull, Via Augusta 390, 08017, Barcelona, Spain. Electronic address: rafael.gonzalez@iqs.url.edu.
authors.forename: Rafael
authors.initials: R
authors.lastname: Gonzalez-Olmos
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry; D001895:Boron / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry; D018130:Diamond / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D006861:Hydrogen Peroxide / Q000737:chemistry*; D009566:Nitrates / Q000737:chemistry; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D010782:Photolysis; D062065:Wastewater; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D000814:Aniline Compounds; D001895:Boron; D002245:Carbon Dioxide; D018130:Diamond; D006861:Hydrogen Peroxide; D009566:Nitrates; D010100:Oxygen; D062065:Wastewater; D014867:Water; D014874:Water Pollutants, Chemical; C416807:polyaniline; C023650:aniline
keywords: Advanced oxidation processes; Aniline; BDD; Electro-oxidation; UV/H(2)O(2)