0872-1904 0872-1904 S0872-19042003000100004 Brazil 00 00 2003 00 00 2003 21 1 49 67

A Comparative Study on Chemical and Electrochemical Degradation of Reactive Blue 4 Dye

 

Patricia A. Carneiro, Cecílio S. Fugivara, Raquel F. P. Nogueira, Nivaldo Boralle, Maria V. B. Zanon*

Instituto de Química - UNESP, C. P. 355, 14801-970 Araraquara, SP, Brazil

Received 02 September 2002; accepted in revised form 29 November 2002

 

Abstract

The degradation of a reactive blue 4 dye in acidic solution has been compared using electrochemical reduction and oxidation at reticulated vitreous carbon electrode (RVC) and Ti/SnO2/SbOx (3%mol)/RuO2 (30%mol) electrodes and photo–Fenton method under UV irradiation. The reduction of RB4 dye at –0.6 V on RVC electrode results in 50% of color removal and up to 64% of TOC removal. The direct oxidation of RB4 dye at +1 V on RVC promotes only the oxidation of amine group and there is no color removal. On SnO2 electrode, 58% TOC was removed and the decolorization is around 100 % after 1 hour of electrolysis at 2.4 V indicating good efficiency.  Best performance was obtained by photo-Fenton method that indicates 80% elimination of TOC and 100% of color removal but the method requires oxidant addition and time of rest to remove the generated residues.

Keywords: anthraquinone dyes, electro-reduction, electro-oxidation, Photo-Fenton, Reactive Blue 4.

 

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* Corresponding author. E-mail address: boldrinv@iq.unesp.br

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