Synthesis of Zeolite Nanocrystals at Room Temperature

Zeolite A nanoparticles were synthesized under room-temperature conditions from a very reactive organic-template-free gel system. The optimization of the syntheses parameters, namely, the composition of the initial system and the careful choice of the reactants, allowed the crystallization to be acc...

Full description

Saved in:
Bibliographic Details
Published in:Langmuir 2005-11, Vol.21 (23), p.10724-10729
Main Authors: Valtchev, Valentin P, Tosheva, Lubomira, Bozhilov, Krassimir N
Format: Article
Language:English
Subjects:
Chemical Sciences
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Ion-exchange
Material chemistry
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Surface physical chemistry
Zeolites: preparations and properties
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Zeolite A nanoparticles were synthesized under room-temperature conditions from a very reactive organic-template-free gel system. The optimization of the syntheses parameters, namely, the composition of the initial system and the careful choice of the reactants, allowed the crystallization to be accomplished within 3 days. At this stage the individual zeolite crystals were in the range of 100−300 nm without well-developed crystal faces. The prolongation of the synthesis time up to 10 days led to formation of larger well-faceted cubic crystals averaging about 400−500 nm in size. The high-resolution transmission electron microscopy (HRTEM) study revealed that a thin layer of amorphous material covers the zeolite particles acting as a binder between individual zeolite crystals. The postsynthesis treatment of the product in NH3 media under ultrasonic radiation disintegrated the loosely attached zeolite particles and decreased the fraction of zeolite A particles with low colloidal stability. The employed approach, however, did not result in complete disintegration of aggregated crystals. The zeolite crystals obtained under ambient conditions were characterized by XRD, SEM, dynamic light scattering, and N2 adsorption measurements.
ISSN:0743-7463
1520-5827
DOI:10.1021/la050323e