Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 116, Issue 1-3, Pages 416-423Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2008.04.032
Keywords
Zeolite nanocrystals; Chitosan; Hydrogels; Hydrothermal; Hydrogen peroxide
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Funding
- Australian Research Council [DP0452829]
- Monash University
- Australian Research Council [DP0452829] Funding Source: Australian Research Council
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For the purpose of controlling zeolite crystal size, crystallization of zeolite NaA and NaY in glutaraldehyde crosslinked chitosan (GA-CS) hydrogels was studied in this paper. The zeolite crystals were produced by penetration of Na2O-Al2O3-H2O alkaline solution into GA-CS hydrogels filled with colloidal silica, followed by hydrothermal treatment and removal of GA-CS hydrogels. We systematically investigated the effects of the synthesis parameters - including the amounts of silica, chitosan, and glutaraldehyde, and the aging and heating times - on the size, size distribution and crystallinity of the particles. A hydrogen peroxide treatment method was shown to be an effective way for removing GA-CS hydrogels, thereby avoiding the conventional calcination step. X-ray diffraction (XRD), light scattering, scanning electron microscopy (SEM), thermogravimetric analysis (TG), and N-2 sorption were used to characterize the zeolite samples. This work showed that GA-CS is a promising space-confinement medium for the synthesis of zeolite nanocrystals with tunable crystal sizes and excellent dispersibility. (C) 2008 Elsevier Inc. All rights reserved.
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