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Issue 44, 2009
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Fabrication of ice-templated macroporous TiO2–chitosan scaffolds for photocatalytic applications

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Abstract

Higher-ordered 3D macroporous TiO2-functionalized chitosan scaffolds were prepared by ice segregation induced self-assembly (ISISA), in which homogenous dispersions of 6, 27 or 200 nm sized TiO2nanoparticles and chitosan cross-linked with glycidoxypropyltrimethoxysilane were unidirectionally frozen at −196 °C. Scanning electron microscopy showed that under established optimum conditions the monoliths comprised well-aligned 30–50 µm sized micro-channels running parallel to the direction of ice growth. The surface morphology of the internal wall structure was influenced by the size of the titania nanoparticles. Scaffolds prepared in the presence of 6 nm sized anatase particles showed featureless walls with concealed/embedded nanoparticles, whereas larger TiO2 particles remained exposed at the surface of the channel walls. Mechanical properties of the composite scaffolds were studied under compressive loads and stress–strain measurements obtained, and the effect of particle size on the elastic properties of the macroporous constructs determined. The hybrid scaffolds were shown to be reusable substrates for the photocatalytic degradation of methylene blue and Orange II dye molecules.

Graphical abstract: Fabrication of ice-templated macroporous TiO2–chitosan scaffolds for photocatalytic applications

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Supplementary files

Article information


Submitted
29 Jun 2009
Accepted
28 Aug 2009
First published
12 Oct 2009

J. Mater. Chem., 2009,19, 8478-8483
Article type
Paper

Fabrication of ice-templated macroporous TiO2–chitosan scaffolds for photocatalytic applications

C. Suwanchawalit, A. J. Patil, R. K. Kumar, S. Wongnawa and S. Mann, J. Mater. Chem., 2009, 19, 8478
DOI: 10.1039/B912698H

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