Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 115, Issue 1-2, Pages 75-84Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2007.12.041
Keywords
layered silicate; molecular sieve; ion exchange; intercalation; swelling
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Proton-exchanged AMH-3 was prepared by ion exchange of interlayer cations of the layered silicate AMH-3 using an aqueous solution of amino acid. Moreover, swollen AMH-3 was prepared by a procedure involving sequential intercalation of primary amine molecules following proton exchange. Structural characteristics of both AMH-3 derivative materials were investigated using characterization techniques such as XRD, SEM, TEM, NMR, FT-IR, TGA, and N-2 adsorption. Both processes lead to structural changes and condensation of silanol groups located on the silicate layer surface. Proton-exchanged AMH-3 is an amorphous powder with the same particle size and shape as the original AMH-3 crystals. Due to the structural changes, swollen AMH-3 should be considered as a new layered silicate material rather than an intercalated phase. The swollen AMH-3 powder shows limited evidence for the presence of a nanoporous framework, suggesting that its use as a molecular sieve additive for improved selectivity nanocomposite membranes is worth exploring. (C) 2008 Elsevier Inc. All rights reserved.
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