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Physicochemical Properties of Organo­Smectites Modified by HDTMA, BDTDA, and CP  

고상모 (한국지질자원연구원 지질기반정보연구부 광물자원연구실)
홍석정 (한국지질자원연구원 지질기반정보연구부 광물자원연구실)
송민섭 (한국지질자원연구원 지질기반정보연구부 광물자원연구실)
Publication Information
Journal of the Mineralogical Society of Korea / v.16, no.4, 2003 , pp. 295-305 More about this Journal
Abstract
This study aims to provide the physicochemical properties of three kinds of organo­smectites which can be diversely used in industries. Some properties of them were compared with Na­smectite. Three kinds of organo­smectites such as Hexadecyltrimethylammonium(HDTMA), Benzyldimethyltetradecylammonium(BDTDA), and Cetylpyridinium(CP) exchanged smectites were manufactured for this study. Three types of organo­smectites showed the alkaline character(pH 9), very low swelling property and viscosity, and a fast flocculation behavior because of strong hydrophobic property in contrast to hydrophilic Na­smectite. Three organo­smectites showed the strong interlayer expansion with basal spacing from $19\AA$ to $23\AA$ compared with the Na­smectite of about 12 $\AA$. Organic cations such as HDTMA, BDTDA, and CP exchanged into smectite were completely decomposed in the temperature range from $250^{\circ}C$ to $400^{\circ}C$. Generally, three organo­smectites showed the similar mineralogical, physicochemical and thermal properties. But their properties are quite different from Na­smectite. Considering economically, CP exchanged smectite would be used for the diverse utilization field in the future time.
Keywords
HDTMA; BDTDA; CP; pH; organo­smectite; organic cation; HDTMA; BDTDA; CP; pH; viscosity; swelling; flocculation; interlayer expansion; decomposition;
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