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Preparation of photoactive chitosan–niobium (V) oxide composites for dye degradation

Paper ID Volume ID Publish Year Pages File Format Full-Text
28706 44086 2006 5 PDF Available
Title
Preparation of photoactive chitosan–niobium (V) oxide composites for dye degradation
Abstract

From an environmental standpoint, heterogeneous photocatalysis is a significant cutting-edge technology for application in water purification. Moreover, immobilising an appropriate catalyst onto the surface of a natural organic polymer presents a number of additional advantages including low-cost, high catalytic activity and extensive potential for reuse. In the present work, composites of niobium (V) oxide and chitosan (Chit/Nb) were prepared with semiconductor loadings in the range 0–13.9% attached to the polymer surface. Scanning electron microscopy (SEM) and niobium mapping with X-ray energy dispersive spectrometry showed that the niobium (V) oxide was homogeneously dispersed over the surface of the composites. Lewis and Bronsted acid sites were present on the biopolymer surfaces, the acidic character of which increased with the amount of semiconductor attached. The Chit/Nb composites were used to photocatalyse the degradation of indigo carmine dye in aqueous solution by UV irradiation. The kinetic constants were obtained by application of the Langmuir–Hinshelwood equation and determined to be 5.32, 5.90 and 9.10 μmol L−1 h−1, respectively, for Chit/Nb composites with semiconductor loadings of 3.9, 9.3 and 13.9%, respectively. Whilst the thermal stabilities of the Chit/Nb composites were slightly lower than that of the pure biopolymer, the materials presented high catalytic efficiencies that remained unaltered after 15 cycles of reuse.

Keywords
Chitosan; Niobium; Photodegradation
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Preparation of photoactive chitosan–niobium (V) oxide composites for dye degradation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 182, Issue 2, 31 August 2006, Pages 202–206
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us