Degradation of Azo Dyes by the Reduction and Oxidation with Nano Sized Zero Valented Iron

Abstract:

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The objective of this study is to investigate the efficient method to maximize both color and TOC removal of the azo dye solution by reduction and oxidation with a laboratory synthesized nano-sized zero valent iron (nZVI). The decolorization efficiency increased with the decrease of pH and increase of zero valent iron dosage. The optimum dosage of nano-sized zero-valent iron was 20mg/L at pH 3. The surface normalized constant of nZVI was higher than those reported for the discoloring of azo dye with other ZVIs. The sequential dose of nZVI/H2O2 remove color and TOC more effectively than the simultaneous dose. Pre-reduction by nZVI could convert azo dye to products whose oxidation is more degradable and therefore enhances the removal efficiency.

Info:

Periodical:

Materials Science Forum (Volumes 544-545)

Edited by:

Hyungsun Kim, Junichi Hojo and Soo Wohn Lee

Pages:

705-708

DOI:

10.4028/www.scientific.net/MSF.544-545.705

Citation:

B.H. Moon et al., "Degradation of Azo Dyes by the Reduction and Oxidation with Nano Sized Zero Valented Iron", Materials Science Forum, Vols. 544-545, pp. 705-708, 2007

Online since:

May 2007

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Price:

$35.00

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