INOR-037: Encapsulation of hazardous metals with organic modified minerals

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The authors studies have focused on the development of new materials for the control, treatment, and long term storage of hazardous metals. The process involves the introduction of hazardous cations into the matrix of clays through aqueous ion-exchange methods. These cations are subsequently encapsulated within the clay by treating the material with a variety of organic silanes. This treatment results in the formation of organic coatings which are chemically bonded to the surface of the clay. The coatings are hydrophobic in nature, and may restrict the diffusion of water into and out of the pores contained within the clay. The ... continued below

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Song, Kang; Wasserman, R. & Yuchs, S.E. December 31, 1995.

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The authors studies have focused on the development of new materials for the control, treatment, and long term storage of hazardous metals. The process involves the introduction of hazardous cations into the matrix of clays through aqueous ion-exchange methods. These cations are subsequently encapsulated within the clay by treating the material with a variety of organic silanes. This treatment results in the formation of organic coatings which are chemically bonded to the surface of the clay. The coatings are hydrophobic in nature, and may restrict the diffusion of water into and out of the pores contained within the clay. The goal of this process is to reduce the undesirable migration of hazardous metals from the ion-exchanged clays into the environment. A smectic type clay, bentonite, has been the primary inorganic matrix for this study. Bentonite, which is a form of montmorillonite, consists of two-dimensional sheets of aluminosilicates. Like other smectite clays, these sheets are separated by an interlayer which contains cations and water. The reactive groups within the alkyl silanes react with hydroxyl groups on the clay surface, as well as water contained on and within the clay. The authors results show that there is little difference in the metal content of the coated and noncoated clays. The cations are not removed from the clay by exposure to the silane. The clays also maintain their general structure and cystallinity upon surface modification. The organic coatings are stable to 500{degrees}C when heated under nitrogen. The ability of these systems to encapsulate the cations and prevent their migration into the environment is currently being evaluated.

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3 p.

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OSTI as DE97008260

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  • 210. national meeting of the American Chemical Society (ACS), Chicago, IL (United States), 20-25 Aug 1995

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  • Other: DE97008260
  • Report No.: ANL/CHM/PP--87593
  • Report No.: CONF-950801--29
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 532653
  • Archival Resource Key: ark:/67531/metadc689964

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  • December 31, 1995

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  • Aug. 14, 2015, 8:43 a.m.

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  • June 23, 2016, 12:10 p.m.

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Song, Kang; Wasserman, R. & Yuchs, S.E. INOR-037: Encapsulation of hazardous metals with organic modified minerals, article, December 31, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc689964/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.