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Synthesis and characterization of iodosodalite

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.14772· OSTI ID:1400849
 [1];  [2];  [3];  [4];  [5]
  1. Materials Science and Engineering Program Washington State University Pullman Washington
  2. School of Chemical Engineering and Bioengineering Washington State University Pullman Washington, Pacific Northwest National Laboratory Richland Washington
  3. School of Mechanical and Materials Engineering Washington State University Pullman Washington
  4. Materials Science and Engineering Program Washington State University Pullman Washington, Pacific Northwest National Laboratory Richland Washington
  5. Materials Science and Engineering Program Washington State University Pullman Washington, Pacific Northwest National Laboratory Richland Washington, School of Mechanical and Materials Engineering Washington State University Pullman Washington

Abstract

The effects of six process variables were investigated on the hydrothermal growth of iodosodalite, Na 8 Al 6 Si 6 O 24 I 2 : pH (Na OH concentration), aging time, temperature, Al/Si ratio, precursors used (i.e., zeolite 4A, kaolinite, meta‐kaolin, colloidal silica, and sodium aluminate), and precursor concentration. Powder X‐ray diffraction ( XRD ) with Rietveld refinements, X‐ray photoelectron spectroscopy ( XPS ), Fourier transform infrared spectroscopy ( FTIR ), and scanning electron microscopy ( SEM ) were performed to characterize the structures, phase fractions, chemical state, and surface morphology of the synthesized products. Iodosodalite yield increased as aging time and pH increased. The crystallization of iodosodalite was favored in the temperature range 140°C‐180°C. Decreasing the Al/Si ratio by half increased the crystallization of basic cancrinite. Lowering the precursor concentration by adding water revealed the crystallization of nepheline hydrate I and a decrease in the sodalite fraction. Among the tested precursors, zeolite 4A yielded the highest mass fraction of iodosodalite in the synthesized powders. From the aging time and temperature variation experiments, the phase transformation of zeolite A→sodalite→cancrinite was observed. XPS and FTIR results showed the presence of only iodide but not iodate in the synthesized product. The crystallization of various minerals suggests that mechanisms for transport of the ions and formation of the aluminosilicate frameworks vary with hydrothermal conditions.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NE0008257; NE0008257
OSTI ID:
1400849
Alternate ID(s):
OSTI ID: 1363988
Journal Information:
Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 5 Vol. 100; ISSN 0002-7820
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United States
Language:
English

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