Mechanochemically enhanced synthesis of isomorphously substituted kaolinites

    Authors

    D. T. Restrepo; C. Griebel; K. Giesler; E. J. Buker; D. K. Silletti; S. A. Brokus; G. Peaslee;R. G. Blair

    Comments

    Authors: contact us about adding a copy of your work at [email protected]

    Abbreviated Journal Title

    Appl. Clay Sci.

    Keywords

    Mechanochemistry; Hydrothermal; Kaolinite; Substitution; Rare earths; HYDROTHERMAL SYNTHESIS; DEGREES-C; RICH; TEMPERATURE; CATALYSIS; CHEMISTRY; AL; Chemistry, Physical; Materials Science, Multidisciplinary; Mineralogy

    Abstract

    A mechanochemical method for the rapid, bulk synthesis of kaolinite has been developed. Metal hydroxides and silicic acid are mechanically ground and hydrothermally treated for as little as a day at 250 C to produce X-ray pure crystalline materials. This approach has been expanded to allow the synthesis of kaolinites with a portion of the aluminum sites isomorphously substituted with other trivalent metals. The synthetic parameters, such as length of mechanical and hydrothermal treatment, were studied. Products were analyzed by powder X-ray diffraction, attenuated total reflectance infrared spectrometry, scanning electron microscopy, and transmission electron microscopy. The samples exhibited strong order along the c axis and less order along the a and b axes. Trivalent transition and rare earth metals were used to replace aluminum in the structure. These metals included Cr, La, Ce, Pr, Nd, Eu, Gd, Ho. and Er. Cerium (Ill) substituted kaolinite was successfully synthesized utilizing air-free conditions. This approach allows bulk quantities of substituted kaolinites to be prepared in a relatively short amount of time and offers a new route to synthesize pure and substituted kaolinites that may have novel catalytic properties. (C) 2011 Elsevier B.V. All rights reserved.

    Journal Title

    Applied Clay Science

    Volume

    52

    Issue/Number

    4

    Publication Date

    1-1-2011

    Document Type

    Article

    Language

    English

    First Page

    386

    Last Page

    391

    WOS Identifier

    WOS:000291908500009

    ISSN

    0169-1317

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