Microwave-hydrothermal synthesis of Al-substituted tobermorite from zeolites

被引：29

作者：

Komarneni, S ^{[1
]}

Komarneni, JS ^{[1
]}

Newalkar, B ^{[1
]}

Stout, S ^{[1
]}

机构：

[1] Penn State Univ, Inst Mat Res, Mat Res Lab, University Pk, PA 16802 USA

来源：

MATERIALS RESEARCH BULLETIN | 2002年 / 37卷 / 06期

关键词：

ceramics; layered compounds; microporous materials; chemical synthesis;

D O I：

10.1016/S0025-5408(02)00758-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 2 h at 180degreesC and they showed high selectivity for Cs. For example, an Al-substituted tobermorite synthesized from phillipsite showed Cs exchange K-d 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. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：1025 / 1032

页数：8

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