naa a22 4500 510749003 CHVBK 20180411083057.0 cr unu---uuuuu 180411e20130101xx s 000 0 eng 10.1007/s11270-012-1397-9 doi (NATIONALLICENCE)springer-10.1007/s11270-012-1397-9 Electrochemical Degradation of the Reactive Red 141 Dye Using a Boron-Doped Diamond Anode [Elektronische Daten] [José Aquino, Romeu Rocha-Filho, Manuel Rodrigo, Cristina Sáez, Pablo Cañizares] The electrochemical degradation of the Reactive Red 141 azo dye was done using a one-compartment filter-press flow cell with a boron-doped diamond anode. The response surface methodology (with a central composite design) was used to investigate the effect of current density (10-50mA cm−2), pH (3-11), NaCl concentration ([NaCl]) (0-2.34g L-1), and temperature (15-55°C) on the system's performance. The charge required for 90% decolorization (Q 90), the fraction of chemical oxygen demand removal after 6min of electrolysis (COD6), and the fraction of total organic carbon removal after 90min of electrolysis (TOC90) were used to model the obtained results. The lowest values of Q 90 were attained at pH <4 in the presence of higher values of [NaCl] (>1.5g L−1), due to the electrogeneration of active chlorine, present mainly as HClO. The value of COD6 was not affected by the solution pH, but increased with [NaCl] up to 1.5g L−1. Higher temperatures (>40°C) led to a decrease in COD6, as a consequence of side reactions. Higher values of TOC90, which can be reached only with strong oxidants (such as ·OH and Cl·), were efficiently attained at low [NaCl] values (<0.7g L−1) in acidic solutions that inhibit the formation of ClO3 − and ClO4 −. Finally, the obtained results allow inferring that most probably the mineralization of the dye starts with an attack on the chromophore group, followed by the degradation of intermediate species. Springer Science+Business Media Dordrecht, 2012 Response surface methodology nationallicence Conductive-diamond anode nationallicence Electrochemical oxidation nationallicence Dye mineralization nationallicence Dye electrooxidation nationallicence Chloride mediated oxidation nationallicence Aquino José Department of Chemistry, Universidade Federal de São Carlos, C.P. 676, 13560-970, São Carlos, São Paulo, Brazil aut Rocha-Filho Romeu Department of Chemistry, Universidade Federal de São Carlos, C.P. 676, 13560-970, São Carlos, São Paulo, Brazil aut Rodrigo Manuel Department of Chemical Engineering, Facultad de Ciencias Químicas, Universidad de Castilla La Mancha, Campus Universitario s/n., 13071, Ciudad Real, Spain aut Sáez Cristina Department of Chemical Engineering, Facultad de Ciencias Químicas, Universidad de Castilla La Mancha, Campus Universitario s/n., 13071, Ciudad Real, Spain aut Cañizares Pablo Department of Chemical Engineering, Facultad de Ciencias Químicas, Universidad de Castilla La Mancha, Campus Universitario s/n., 13071, Ciudad Real, Spain aut Water, Air, & Soil Pollution Springer Netherlands 224/1(2013-01-01), 1-10 0049-6979 224:1<1 2013 224 11270 https://doi.org/10.1007/s11270-012-1397-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-012-1397-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Aquino José Department of Chemistry, Universidade Federal de São Carlos, C.P. 676, 13560-970, São Carlos, São Paulo, Brazil aut NATIONALLICENCE 700 1- Rocha-Filho Romeu Department of Chemistry, Universidade Federal de São Carlos, C.P. 676, 13560-970, São Carlos, São Paulo, Brazil aut NATIONALLICENCE 700 1- Rodrigo Manuel Department of Chemical Engineering, Facultad de Ciencias Químicas, Universidad de Castilla La Mancha, Campus Universitario s/n., 13071, Ciudad Real, Spain aut NATIONALLICENCE 700 1- Sáez Cristina Department of Chemical Engineering, Facultad de Ciencias Químicas, Universidad de Castilla La Mancha, Campus Universitario s/n., 13071, Ciudad Real, Spain aut NATIONALLICENCE 700 1- Cañizares Pablo Department of Chemical Engineering, Facultad de Ciencias Químicas, Universidad de Castilla La Mancha, Campus Universitario s/n., 13071, Ciudad Real, Spain aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/1(2013-01-01), 1-10 0049-6979 224:1<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer