On the performance of Fe and Fe,F doped Ti-Pt/PbO2 electrodes in the electrooxidation of the Blue Reactive 19 dye in simulated textile wastewater.
The electrochemical performance of pure Ti-Pt/beta-PbO2 electrodes, or doped with Fe and F (together or separately), in the oxidation of simulated wastewaters containing the Blue Reactive 19 dye (BR-19), using a filter-press reactor, was investigated and then compared with that of a boron-doped diamond electrode supported on a niobium substrate (Nb/BDD). The electrooxidation of the dye simulated wastewater (volume of 0.1 l, with a BR-19 initial concentration of 25 mg l(-1)) was carried out under the following conditions: current density of 50 mA cm(-2), volume flow rate of 2.4 l h(-1), temperature of 25 degrees C and electrode area of 5 cm2. The performances of the electrodes in the dye decolorization were quite similar, achieving 100% decolorization, and in some cases 90% decolorization was achieved by applying only ca. 0.3 A h l(-1) (8 min of electrolysis). The reduction of the simulated wastewater organic load, monitored by its total organic carbon content (TOC), was greater for the Ti-Pt/beta-PbO2-Fe,F electrode obtained from an electrodeposition bath containing 1 mM Fe3+ and 30 mM F-. In this case, after 2 h of electrolysis the obtained TOC reduction was 95%, while for the pure beta-PbO2 and the Nb/BDD electrodes the reductions were 84% and 82%, respectively.
Andrade
Leonardo S
LS
Departamento de Química, Universidade Federal de São Carlos, C. P. 676, 13560-970 São Carlos, SP, Brazil.
Ruotolo
Luís Augusto M
LA
Rocha-Filho
Romeu C
RC
Bocchi
Nerilso
N
Biaggio
Sonia R
SR
Iniesta
Jesús
J
García-Garcia
Vicente
V
Montiel
Vicente
V
D004396:Coloring Agents / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D005461:Fluorine; D007501:Iron; D007854:Lead; D015394:Molecular Structure; D010084:Oxidation-Reduction; D010087:Oxides; D010984:Platinum; D014025:Titanium; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
D004396:Coloring Agents; D010087:Oxides; D014874:Water Pollutants, Chemical; D005461:Fluorine; D007854:Lead; D010984:Platinum; C047365:lead oxide; D014025:Titanium; D007501:Iron