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Decolorization of structurally different synthetic dyes using cobalt(II)/ascorbic acid/hydrogen peroxide system.

Authors
  • Verma, Pradeep
  • Baldrian, Petr
  • Nerud, Frantisek
Type
Published Article
Journal
Chemosphere
Publisher
Elsevier
Publication Date
Mar 01, 2003
Volume
50
Issue
8
Pages
975–979
Identifiers
PMID: 12531702
Source
Medline
License
Unknown

Abstract

The cobalt(II)/ascorbic acid/hydrogen peroxide system was used for decolorization of azo, acridine, anthraquinone, thiazine and triphenylmethane dyes. More than 90% decolorization was obtained with all dyes except Remazol Brilliant Blue R (75%). With other transition metals the system was less efficient. With copper, higher concentration and prolonged incubation time was necessary to obtain the same extent of decolorization. The rate of decolorizaton was not affected by pH in the range of 3-9. The reaction is very fast, with more than 90% decolorization being attained within 15 min. The system produces hydroxyl radicals which are responsible for the decolorization.

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