Microwave-hydrothermal synthesis of Al-substituted tobermorite from zeolites

Sridhar Komarneni, Jayanth S. Komarneni, Bharat Newalkar, Stephen Stout

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Abstract

Here, we report the rapid synthesis of Al-substituted tobermorites from zeolites under microwave-hydrothermal (M-H) conditions. The synthesized phases were characterized by powdered XRD analysis, SEM and selective Cs exchange determination. Zeolites served as aluminosilicate sources and M-H conditions yielded highly crystalline Al-substituted tobermorites in 2h at 180°C and they showed high selectivity for Cs. For example, an Al-substituted tobermorite synthesized from phillipsite showed Cs exchange Kd of 2161±465 and 118,589±44,928 from 0.02N NaCl and 0.02N CaCl2 solutions (both contained 0.0002N CsCl), respectively. Al-substituted tobermorites are expected to be useful for the selective separation of radioactive Cs and tobermorites can be incorporated in cement and/or concrete matrix for Cs immobilization.

Original languageEnglish (US)
Pages (from-to)1025-1032
Number of pages8
JournalMaterials Research Bulletin
Volume37
Issue number6
DOIs
Publication statusPublished - May 2002

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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