The effects of surface modification on the speciation of metal ions intercalated into aluminosilicates

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Microporous aluminosilicates, including clay minerals and zeolites, are ion-exchange materials. In their most common forms, they have the ability to incorporate cationic species within their matrices. Because of this property, microporous aluminosilicates have been proposed as storage media for hazardous waste. In this paper the authors use X-ray absorption spectroscopy (XAS) to examine the structure of cations held within smectite clay minerals and to determine how modification of the surface of the clay using an organic monolayer affects the coordination of the stored cation. The effects of hydrothermal and thermal processing on the coordination of the ions contained within these ... continued below

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10 p.

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Wasserman, S.R.; Giaquinta, D.M.; Yuchs, S.E. & Soderholm, L. December 31, 1996.

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Description

Microporous aluminosilicates, including clay minerals and zeolites, are ion-exchange materials. In their most common forms, they have the ability to incorporate cationic species within their matrices. Because of this property, microporous aluminosilicates have been proposed as storage media for hazardous waste. In this paper the authors use X-ray absorption spectroscopy (XAS) to examine the structure of cations held within smectite clay minerals and to determine how modification of the surface of the clay using an organic monolayer affects the coordination of the stored cation. The effects of hydrothermal and thermal processing on the coordination of the ions contained within these systems are also investigated. The presence of the monolayer changes the surface of the clay from hydrophilic to hydrophobic. It inhibits the interlayer ions from exchanging freely into environmental water and reduces the leach rate of cations out of the clay by approximately a factor of 20. Significant changes are observed when these coated samples are treated under hydrothermal and thermal conditions. Reductions of uranium (VI), in the form of uranyl, and cupric ions occur. In addition, the uranium aggregates, forming small particles that appear similar to UO{sub 2}. Comparable conglomeration occurs with lead cations and with the reduced copper species.

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10 p.

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INIS; OSTI as DE97001993

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  • 1996 Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1996

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  • Other: DE97001993
  • Report No.: ANL/CHM/CP--90431
  • Report No.: CONF-961202--57
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/432909 | External Link
  • Office of Scientific & Technical Information Report Number: 432909
  • Archival Resource Key: ark:/67531/metadc679755

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  • December 31, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Dec. 16, 2015, 12:23 p.m.

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Wasserman, S.R.; Giaquinta, D.M.; Yuchs, S.E. & Soderholm, L. The effects of surface modification on the speciation of metal ions intercalated into aluminosilicates, report, December 31, 1996; Illinois. (digital.library.unt.edu/ark:/67531/metadc679755/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.