Issue
J. Phys. IV France
Volume 7, Number C2, Avril 1997
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
Page(s) C2-803 - C2-807
DOI https://doi.org/10.1051/jp4:1997240
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure

J. Phys. IV France 7 (1997) C2-803-C2-807

DOI: 10.1051/jp4:1997240

Nanoscale Encapsulation : The Structure of Cations in Hydrophobic Microporous Aluminosilicates

S.R. Wasserman, S.E. Yuchs, D. Giaquinta, L. Soderholm and K. Song

Chemistry Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, IL 60439, U.S.A.


Abstract
Hydrophobic microporous aluminosilicates created by the modification of zeolites and clays are currently being investigated as storage media for hazardous cations. Addition of an organic monolayer to the surface of an aluminosilicate after introduction of an ion into the zeolite or clay reduces the interaction of water with the material. The resultant systems are approximately 20 times more resistant to leaching of the stored ion than the unmodified ion-exchanged materials. XAS spectra demonstrate that byproducts from the organic modifier can complex with the encapsulated cation. This complexation can result in a decreased affinity of the cation for the aluminosilicate matrix. Changing the organic modifier eliminates this problem. XAS spectra also indicate that the reactivity and subsequent speciation of the encapsulated ion alters upon application of the hydrophobic layer.



© EDP Sciences 1997