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2 results

  • Identification of Tetramethylammonium Ion in Methylated NH4-Bentonite

  • M. A. Franco, C. Gessa, F. Cariati
  • Journal:
    Clays and Clay Minerals / Volume 26 / Issue 1 / February 1978
    Published online by Cambridge University Press:
    01 July 2024, pp. 73-75
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  • Treating NH4-bentonite with diazomethane results in methylation of adsorbed ammonium with the formation of the tetramethylammonium ion. This ion, which can be completely removed through ion exchange, is distinguished in the IR spectrum by a strong band at 1480 cm−1 due to CH3 group bending vibrations. X-ray diffractograms, CEC, and surface area of the clay are not modified by treatment with diazomethane.

  • Methylation of Sepiolite and Palygorskite with Diazomethane

  • María C. Hermosín, Juan Cornejo
  • Journal:
    Clays and Clay Minerals / Volume 34 / Issue 5 / October 1986
    Published online by Cambridge University Press:
    02 April 2024, pp. 591-596
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  • The methylation of the fibrous clays, sepiolite and palygorskite, should be facilitated by their large content of surface silanol groups and the low acidity and inaccessibility of coordinated water molecules. Infrared spectroscopy showed that the reaction of diazomethane with these clays resulted in the methylation of their silanol surface groups. The grafting of CH3 groups on the surfaces of these clays produced a decrease in the surface area due primarily to the lowering of the microporosity.