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Title: Decolorization of the azo dye Reactive Black 5 by Fenton and photo-Fenton oxidation
Authors: Lucas, Marco S.
Peres, Jose A.
Issue Date: 2006
Publisher: © Elsevier Ltd.
Citation: LUCAS, M. and PERES, J., 2006. Decolorization of the azo dye Reactive Black 5 by Fenton and photo-Fenton oxidation. Dyes and Pigments, 71 (3), pp.236-244
Abstract: The oxidative decolorization of Reactive Black 5 (RB5) in aqueous solution has been studied using Fenton (H2O2/Fe2+) and photo-Fenton (H2O2/Fe2+/UV) processes. This investigation reveals that both methods can remove the color of RB5. Batch experiments were carried out to investigate the process's optimal operational conditions: pH, H2O2 dosage, Fe2+ dosage, RB5 concentration and optimal [Fe2+]0/[H2O2]0/[RB5]0 ratio, to obtain the bests results at low cost, render AOP competitive with other processes. The optimal conditions found were a ratio [H2O2]0/[RB5]0 of 4.9:1, a ratio [H2O2]0/[Fe2+]0 of 9.6:1 and pH = 3.0. The decolorization experiments indicate that RB5 can be effectively decolorized using Fenton and photo-Fenton processes with a little difference between the two processes, 97.5% and 98.1%, respectively, for optimal conditions. This small difference in dye decolorization is not similar to TOC removal: with photo-Fenton process there is a significant increment (46.4% TOC removal) relatively to Fenton process (only 21.6% TOC removal). This fact indicates that although UV low-pressure mercury lamp has little effect on dye decolorization it is particularly important in dye mineralization.
Description: This paper is closed access.
Version: Closed access
DOI: 10.1016/j.dyepig.2005.07.007
URI: https://dspace.lboro.ac.uk/2134/19710
Publisher Link: http://dx.doi.org/10.1016/j.dyepig.2005.07.007
ISSN: 0143-7208
Appears in Collections:Closed Access (Chemical Engineering)

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