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Materials 2016, 9(3), 211; doi:10.3390/ma9030211

Photoassisted Electrochemical Treatment of Azo and Phtalocyanine Reactive Dyes in the Presence of Surfactants

1
Institute of Textile Research and Industrial Cooperation of Terrassa, Universitat Politècnica de Catalunya-Barcelona Tech (UPC), Colom 15, Terrassa 08222, Spain
2
Department of Project and Construction Engineering, Universitat Politècnica de Catalunya-Barcelona Tech (UPC), Colom 11, Terrassa 08222, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Callum McHugh
Received: 12 February 2016 / Revised: 10 March 2016 / Accepted: 15 March 2016 / Published: 18 March 2016
(This article belongs to the Special Issue Functional Organic Dyes and Pigments)
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Abstract

An electrochemical treatment (EC) was applied at different intensities to degrade the chromophoric groups of dyes C.I. Reactive Black 5 (RB5) and C.I. Reactive Blue 7 (Rb7) until uncolored species were obtained. Decolorization rate constants of the azo dye RB5 were higher than the phtalocyanine Rb7 ones. In addition, the EC treatment was more efficient at higher intensities, but these conditions significantly increased the generation of undesirable by-products such as chloroform. The combination of EC with UV irradiation (UVEC) drastically minimized the generation of chloroform. The photo-assisted electrochemical treatment was also able to achieve decolorization values of 99%. Finally, mixtures of dyes and surfactants were treated by EC and UVEC. In the presence of surfactants, the decolorization kinetic of dyes was slowed due to the competitive reactions of surfactants degradation. Both methods achieved total decolorization and in both cases, the generation of haloforms was negligible. View Full-Text
Keywords: textile washing effluents; reactive dyes; azo dyes; phtalocyanine dyes; surfactants; decolorization; electrochemical treatment; photo-assisted electrochemical treatment textile washing effluents; reactive dyes; azo dyes; phtalocyanine dyes; surfactants; decolorization; electrochemical treatment; photo-assisted electrochemical treatment
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Sala, M.; López-Grimau, V.; Gutiérrez-Bouzán, C. Photoassisted Electrochemical Treatment of Azo and Phtalocyanine Reactive Dyes in the Presence of Surfactants. Materials 2016, 9, 211.

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