We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Modified chitosan as an economical support for hematin: application in the decolorization of anthraquinone and azo dyes.
- Authors
Córdoba, Agostina; Magario, Ivana; Ferreira, María Luján
- Abstract
BACKGROUND Azo and anthraquinone dyes have been successfully decolorized using enzymatic and biomimetic homogeneous systems.1,2 Hematin, a horseradish peroxidase (HRP) biomimetic, immobilized on chitosan via glutaraldehyde coupling was able to decolorize Alizarin Red S and Orange II solutions. A Doehlert experimental design and response surface analysis was applied to determine conditions for optimal mass of catalyst and catalytic efficiency of the immobilization procedure. RESULTS The catalysts with supported hematin showed 33% activity (relative to homogeneous hematin as 100%) in decolorization reactions. After six reuses the catalytic activity was maintained at 60% of the initial one. Hematin anchoring to chitosan without alteration of the iron-porphyrin ring was confirmed by ICP, FTIR and UV/visible spectrophotometric methods. In addition, the effect on hematin activity in the decolorization of aminopropyltriethoxysilane (APTS) as a 'spacer arm' between hematin-glutaraldehyde and chitosan was studied. CONCLUSIONS An economical heterogeneous catalyst alternative to HRP has been obtained. The spacer arm improves the catalyst's performance with activities as high as 57% relative to homogeneous hematin. These results support the notion that the activity loss of supported hematin is caused by the restricted access to Fe of the bulky phenolic dyes. © 2014 Society of Chemical Industry
- Subjects
HEME; PEROXIDASE; CHITOSAN; ALIZARIN; ANTHRAQUINONE dyes; AZO dyes
- Publication
Journal of Chemical Technology & Biotechnology, 2015, Vol 90, Issue 9, p1665
- ISSN
0268-2575
- Publication type
Article
- DOI
10.1002/jctb.4475