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...

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Bibliographic Details
Published in:Journal of hazardous materials 2009-07, Vol.166 (1), p.531-537
Main Authors: Paschoal, Fabiana Maria Monteiro, Anderson, Marc A., Zanoni, Maria Valnice B.
Format: Article
Language:English
Subjects:
Applied sciences
Azo Compounds - chemistry
Azo Compounds - radiation effects
Catalysis
Catalytic reactions
Chemical engineering
Chemistry
Chromium - chemistry
Chromium - radiation effects
Chromium reduction
Coloring Agents - chemistry
Coloring Agents - radiation effects
Electrochemical Techniques
Electrodes
Exact sciences and technology
General and physical chemistry
Hydrogen-Ion Concentration
Hydrolyzable Tannins - chemistry
Hydrolyzable Tannins - radiation effects
Industrial Waste - prevention & control
Kinetics
Leather dye
Naphthalenes - chemistry
Naphthalenes - radiation effects
Photobleaching
Photochemical Processes
Photoelectrocatalysis
Photoelectrochemistry
Pollution
Reactors
Surface-Active Agents - chemistry
Surface-Active Agents - radiation effects
Tanning
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
TiO 2 electrode
Titanium
Ultraviolet Rays
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Summary: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/TiO 2 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.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2008.11.058