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Characterization of Synthetic Na-beidellite  

Ryu Gyoung-Won (Chungbuk University, Department of Earth and Environmental Sciences)
Chae Soo-Chun (Korea Institute of Geoscience and Mineral Resources, Minerals and Materials Processing Division)
Bae In-Kook (Korea Institute of Geoscience and Mineral Resources, Minerals and Materials Processing Division)
Choi Sang-Hoon (Chungbuk University, Department of Earth and Environmental Sciences)
Jang Young-Nam (Korea Institute of Geoscience and Mineral Resources, Minerals and Materials Processing Division)
Publication Information
Journal of the Mineralogical Society of Korea / v.18, no.2, 2005 , pp. 109-115 More about this Journal
Abstract
Beidellite, a member of the smectite group, was synthesized hydrothermally from dickite. Physical and chemical properties of the synthetic Na-beidellite were characterized by the analytical methods of XRD, IR, TG, DTA, EDS, XRF and ICP. The result of Greene-Kelly test indicates that the synthesized smectite is Na-beidellite. IR spectrum of synthesized beidellite exhibited Al-O-H bending vibration at $818\;cm^{-1}\;and\;770\;cm^{-1}$ which was observed particularly in pure beidellite. TGA analysis revealed that the synthesized Na-beidellite comprises $16\;wt\%$ of water. DTA curve showed an endothermic peak at $117^{\circ}C$ due to dehydration reaction and peaks at $482^{\circ}C$ and $685^{\circ}C$ due to dehydroxylation reaction. The clay mineral was transformed to mullite and cristobalite at the temperature of $1028^{\circ}C$. The CEC value, Methylene Blue test and swelling capacity was determined to be $116\~118\;cmol/kg,\;84\~91\%,\;29\~32\;mL/2g$, respectively. The chemical composition of the synthesized phase was identified as $Na_{0.5}Al_{2.5}Si_{3.5}O_{10}(OH)_2$ from EDS and XRF analyses.
Keywords
dickite; Na-beidellite; hydrothemal; characterization; IR; TG-DTA;
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