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Synthesis, characterization, and ion-exchange properties of colloidal zeolite nanocrystals

Jawor, Anna and Jeong, Byeong-Heon and Hoek, Eric M. V. (2009) Synthesis, characterization, and ion-exchange properties of colloidal zeolite nanocrystals. Journal of Nanoparticle Research, 11 (7). pp. 1795-1803.

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Here, we present physical-chemical properties of Linde type A (LTA) zeolite crystals synthesized via conventional hydrothermal and microwave heating methods. Both heating methods produced LTA crystals that were sub-micron in size, highly negatively charged, super-hydrophilic, and stable when dispersed in water. However, microwave heating produced relatively narrow crystal size distributions, required much shorter heating times, and did not significantly change composition, crystallinity, or surface chemistry. Moreover, microwave heating allowed systematic variation of crystal size by varying heating temperature and time during the crystallization reaction, thus producing a continuous gradient of crystal sizes ranging from about 90 to 300 nm. In ion-exchange studies, colloidal zeolites exhibited excellent sorption kinetics and capacity for divalent metal ions, suggesting their potential for use in water softening, scale inhibition, and scavenging of toxic metal ions from water.

Item Type:Article
Uncontrolled Keywords:Nanoparticle - Zeolite - Microwave - Hydrothermal synthesis - Ion exchange
Subjects:Technology > Nanotechnology and environmental applications
Material Science > Functional and hybrid materials
Biomedical Science > Nanotechnology for human health
Material Science > Nanostructured materials
ID Code:7700
Deposited By:Lesley Tobin
Deposited On:01 Apr 2010 13:16
Last Modified:01 Apr 2010 13:16

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