Simultaneous removal of chromium and leather dye from simulated tannery effluent by photoelectrochemistry.
The feasibility of the photobleaching of a leather acid dye, acid red 151, simultaneously to degradation of anionic surfactant, Tamol, and reduction of Cr(VI) to the less toxic Cr(III) was investigated by photoelectrocatalytic oxidation. The best experimental conditions were found to be pH 2.0 and 0.1 mol L(-1) sodium sulfate when the nanoporous Ti/TiO2 photo anode was biased at +1.0 V and submitted to UV-irradiation. The photoelectrocatalytic oxidation promotes 100% discoloration, reducing around 98-100% of Cr(VI) and achieving an abatement of 95% of the original total organic carbon. The effect of pH, the applied potential, the Cr(VI) concentration and the complexation reaction between Cr(VI) and acid red dye were evaluated as to their effect on the kinetics of the reaction.
Paschoal
Fabiana Maria Monteiro
FM
Departamento de Química Analítica, Instituto de Química, Universidade Estadual Paulista, Av. Prof. Francisco degni, s/n, C. P. 355 14801-970 Araraquara, SP, Brazil.
Anderson
Marc A
MA
Zanoni
Maria Valnice B
MV
D001391:Azo Compounds / Q000737:chemistry / Q000528:radiation effects; D002857:Chromium / Q000737:chemistry* / Q000528:radiation effects; D004396:Coloring Agents / Q000737:chemistry* / Q000528:radiation effects; D055664:Electrochemical Techniques; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D047348:Hydrolyzable Tannins / Q000737:chemistry / Q000528:radiation effects; D007220:Industrial Waste / Q000517:prevention & control*; D007700:Kinetics; D009281:Naphthalenes / Q000737:chemistry / Q000528:radiation effects; D038761:Photobleaching; D055668:Photochemical Processes; D013501:Surface-Active Agents / Q000737:chemistry / Q000528:radiation effects; D013633:Tanning; D014025:Titanium; D014466:Ultraviolet Rays
C479461:Acid Red-151; D001391:Azo Compounds; D004396:Coloring Agents; D047348:Hydrolyzable Tannins; D007220:Industrial Waste; D009281:Naphthalenes; D013501:Surface-Active Agents; C108021:tamol; D002857:Chromium; C009495:titanium dioxide; D014025:Titanium