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Decolorization of synthetic dyes by hydrogen peroxide with heterogeneous catalysis by mixed iron oxides

Paper ID Volume ID Publish Year Pages File Format Full-Text
49105 46549 2006 7 PDF Available
Title
Decolorization of synthetic dyes by hydrogen peroxide with heterogeneous catalysis by mixed iron oxides
Abstract

Heterogeneous catalysts based on magnetic mixed iron oxides (MO·Fe2O3; M: Fe, Co, Cu, Mn) were used for the decolorization of several synthetic dyes (Bromophenol Blue, Chicago Sky Blue, Cu Phthalocyanine, Eosin Yellowish, Evans Blue, Naphthol Blue Black, Phenol Red, Poly B-411, and Reactive Orange 16). All the catalysts decomposed H2O2 yielding highly reactive hydroxyl radicals, and were able to decolorize the synthetic dyes. The most effective catalyst FeO·Fe2O3 (25 mg mL−1 with 100 mmol L−1 H2O2) produced more than 90% decolorization of 50 mg L−1 Bromophenol Blue, Chicago Sky Blue, Evans Blue and Naphthol Blue Black within 24 h. The fastest decomposition proceeded during the first hour of the reaction. In addition to dye decolorization, all the catalysts also caused a significant decrease of chemical oxygen demand (COD). Individual catalysts were active in the pH range 2–10 depending on their structure and were able to perform sequential catalytic cycles with low metal leaching.

Keywords
Degradation; Synthetic dyes; Hydrogen peroxide; Heterogeneous catalysis; Iron oxides
First Page Preview
Decolorization of synthetic dyes by hydrogen peroxide with heterogeneous catalysis by mixed iron oxides
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 66, Issues 3–4, 20 July 2006, Pages 258–264
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis