The influence of pH on organovermiculite structure stability

There is a large amount of research and application studies in the topic of organically modified vermiculites and their properties. In this work, the stability of two organovermiculites, one modified with hexadecyltrimethylammonium (HDTMA+) and the other modified with hexadecylpyridinium (HDP+) ions...

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Bibliographic Details
Published in:Applied clay science 2014-05, Vol.93-94, p.17-22
Main Authors: Plachá, Daniela, Martynková, Gražyna Simha, Bachmatiuk, Alicja, Peikertová, Pavlína, Seidlerová, Jana, Rümmeli, Mark H.
Format: Article
Language:English
Subjects:
Cations
Diffraction
Earth sciences
Earth, ocean, space
Exact sciences and technology
Fourier transforms
HDP
HDTMA
Mineralogy
Organovermiculite
Scanning electron microscopy
Silicates
Stability
Transmission electron microscopy
Vermiculite
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Summary:There is a large amount of research and application studies in the topic of organically modified vermiculites and their properties. In this work, the stability of two organovermiculites, one modified with hexadecyltrimethylammonium (HDTMA+) and the other modified with hexadecylpyridinium (HDP+) ions, was investigated at pH values from 1 to 14 at laboratory temperature. The organovermiculites in the pH range of 4–10 were stable. In addition, the HDTMA+-vermiculite was stable in strong alkaline media and under extreme acidic conditions as well. However, HDP+-vermiculite underwent significant decomposition when exposed to strong acidic or alkaline conditions (pH 1, 2 and 12, 14). The prepared and tested materials were investigated using X-ray diffraction (XRD) method, Fourier transform infrared (FTIR) spectrometry, total organic carbon content (TOC), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The leaching of structural cations was determined as well. •Organovermiculites are very effective sorbents for non-polar organic compounds.•Organovermiculites are stable when having pH values in the range 4–10.•HDTMA+-vermiculite is also stable in strong alkaline and acidic conditions.•HDP+-vermiculite underwent significant decomposition in strong pH conditions.
ISSN:0169-1317
1872-9053
DOI:10.1016/j.clay.2014.03.008