title: Influence of the current density on the electrochemical treatment of concentrated 1-butyl-3-methylimidazolium chloride solutions on diamond electrodes.
abstract: This paper focuses on the influence of the current density treatment of a concentrated 1-butyl-3-methylimidazolium chloride (BMImCl) solution on an electrochemical reactor with a boron-doped diamond (BDD) anode. The decrease in the total organic carbon (TOC) and the BMImCl concentration demonstrate the capability of BDD in oxidizing ionic liquids (ILs) and further mineralizing (to CO2 and NO3 (-)) more rapidly at higher current densities in spite of the reduced current efficiency of the process. Moreover, the presence of Cl(-) led to the formation of oxychlorinated anions (mostly ClO3 (-) and ClO4 (-)) and, in combination with the ammonia generated in the cathode from the nitrate reduction, chloramines, more intensely at higher current density. Finally, the analysis of the intermediates formed revealed no apparent influence of the current density on the BMImCl degradation mechanism. The current density presents therefore a complex influence on the IL treatment process that is discussed throughout this paper.
authors.affiliation: Instituto de Química, Universidade de Brasília, Campus Universitário Darcy Ribeiro CP 4478, 70910-900, Brasília, DF, Brazil.
authors.forename: Suzana M L de Oliveira
authors.initials: SM
authors.lastname: Marcionilio
authors.affiliation: Instituto de Química, Universidade de Brasília, Campus Universitário Darcy Ribeiro CP 4478, 70910-900, Brasília, DF, Brazil.
authors.forename: Gisele M
authors.initials: GM
authors.lastname: Alves
authors.affiliation: Instituto de Química, Universidade de Brasília, Campus Universitário Darcy Ribeiro CP 4478, 70910-900, Brasília, DF, Brazil.
authors.forename: Rachel B Góes
authors.initials: RB
authors.lastname: E Silva
authors.affiliation: Instituto de Química, Universidade de Brasília, Campus Universitário Darcy Ribeiro CP 4478, 70910-900, Brasília, DF, Brazil.
authors.forename: Pablo J Lima
authors.initials: PJ
authors.lastname: Marques
authors.affiliation: Faculdade UnB Planaltina, Universidade de Brasília, Área Universitária n. 1- Vila Nossa Senhora de Fátima, Planaltina, 73300-000, Brasília, DF, Brazil.
authors.forename: Poliana D
authors.initials: PD
authors.lastname: Maia
authors.affiliation: Instituto de Química, Universidade de Brasília, Campus Universitário Darcy Ribeiro CP 4478, 70910-900, Brasília, DF, Brazil.
authors.forename: Brenno A D
authors.initials: BA
authors.lastname: Neto
authors.affiliation: Instituto de Química, Universidade de Brasília, Campus Universitário Darcy Ribeiro CP 4478, 70910-900, Brasília, DF, Brazil. joselinares@unb.br.
authors.forename: José J
authors.initials: JJ
authors.lastname: Linares
mesh_terms: D001895:Boron / Q000737:chemistry; D018130:Diamond / Q000737:chemistry*; D004553:Electric Conductivity; D004563:Electrochemistry / Q000295:instrumentation*; D004566:Electrodes; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry; D010084:Oxidation-Reduction; D012996:Solutions
chemical_list: D007093:Imidazoles; D052578:Ionic Liquids; D012996:Solutions; C502841:1-butyl-3-methylimidazolium chloride; D018130:Diamond; D001895:Boron
keywords: 1-butyl-3-methylimidazolium chlorine; Boron-doped Diamond; Chlorine species; Electrochemical Oxidations; Intermediates; Ionic Liquids