TY - JOUR
T1 - Zeolite crystallization in crosslinked chitosan hydrogels
T2 - crystal size control and chitosan removal
AU - Li, Dan
AU - Huang, Yi
AU - Ratinac, Kyle R.
AU - Ringer, Simon P.
AU - Wang, Huanting
PY - 2008/12
Y1 - 2008/12
N2 - 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 N2 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.
AB - 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 N2 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.
UR - http://www.scopus.com/inward/record.url?scp=53949096544&partnerID=8YFLogxK
UR - http://purl.org/au-research/grants/arc/DP0452829
U2 - 10.1016/j.micromeso.2008.04.032
DO - 10.1016/j.micromeso.2008.04.032
M3 - Article
AN - SCOPUS:53949096544
VL - 116
SP - 416
EP - 423
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
SN - 1387-1811
IS - 1-3
ER -