Comparative FT-IR study of structural modifications during acid treatment of dioctahedral smectites and hectorite

被引：275

作者：

Madejova, J ^{[1
]}

Bujdak, J ^{[1
]}

Janek, M ^{[1
]}

Komadel, P ^{[1
]}

机构：

[1] Slovak Acad Sci, Inst Inorgan Chem, SK-84236 Bratislava, Slovakia

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 1998年 / 54卷 / 10期

关键词：

acid activation; montmorillonite; nontronite; hectorite; FT-IR spectroscopy;

D O I：

10.1016/S1386-1425(98)00040-7

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Seven dioctahedral smectites of various composition and one trioctahedral smectite (hectorite) were leached in the HCl under different treatment conditions. Hectorite is much more susceptible to acid attack than the dioctahedral smectites. The rate of smectite dissolution increases with increasing octahedral Mg or Fe content as well as with the treatment temperature and acid concentration. The mechanism of smectite dissolution in HCl is independent of layer composition. The final reaction product obtained from acid dissolution of both smectite types is a hydrous amorphous silica phase. FT-IR spectroscopy is a sensitive method for characterization of the starting mineral, identification of some admixtures, such as quartz or kaolinite, and can be useful to assist in controling the extent of acid dissolution. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：1397 / 1406

页数：10

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