A chitosan-templated monolithic siliceous mesoporous-macroporous material |
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Authors: | V Pedroni P C Schulz M E Gschaider de Ferreira M A Morini |
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Institution: | (1) Departamento de Química e Ingeniería Química, Universidad Nacional del Sur 8000 Bahía Blanca, Argentina e-mail: pschulz@criba.edu.ar, AR |
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Abstract: | We synthesised a porous siliceous material via hydrothermal hydrolysis of sodium silicate, using chitosan as a template.
As far as we know, this is the first synthesis of siliceous porous material using chitosan as a template in a hydrothermal
way. A fibrous material was obtained, whose macroscopic fibres were formed by a spongelike siliceous network with pores having
a radius of 0.57 μm. The siliceous walls of the pores were, in turn, of the form of a microporous–mesoporous material; the
pore radius distribution was polymodal with maxima at 0.84, 1.0, 1.2 and 1.5 nm and a broad band between 3 and 10 nm. This
structure may be due to the aggregation of the hydrated chitosan helices in bundles of parallel fibres with different size
and the gelation of the system. The aggregation process might be induced by the addition of silicate.
Received: 12 January 2000/Accepted: 7 March 2000 |
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Keywords: | MCM-41 synthesis Chitosan Mesoporous– macroporous material Monolithic material |
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