Topic
Vermiculite
About: Vermiculite is a research topic. Over the lifetime, 2320 publications have been published within this topic receiving 37142 citations.
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TL;DR: In this paper, X-ray diffraction analysis of mixed alkylammonium-exchanged smectite revealed segregation of different ion species into randomly ordered layers, which is explained by the hydration properties of cations as well as the energy requirements of layer expansion.
Abstract: X-ray diffraction analysis of mixed alkylammonium-exchanged smectite revealed segregation of different ion species into randomly ordered layers. Vermiculite, however, showed segregation into crystallites, a behavior attributed to clay inhomogeneity. Ion segregation is explained by the hydration properties of cations as well as the energy requirements of layer expansion. Quaternary ammonium ions of different size were used to exchange ethylammonium-clays, and the effectiveness, as well as steric hindrance, of cation size in ion exchange was demonstrated. Layer charge density was related to the degree of ease of large cation adsorption. Basal spacing in suspension was found to be important in determining the preference of vermiculite for certain cations, while more freely-expanding, lower layer charge smectite did not demonstrate this phenomenon.
32 citations
TL;DR: In this article, reaction path modeling of water-rock interaction in a gneissic shallow aquifer of the Sila Massif was performed in kinetic (time) mode, under conditions of closed system with secondary minerals and closed-system with CO 2, to investigate the influence of both dolomite dissolution and biotite dissolution on the chemical characteristics of secondary vermiculites.
32 citations
TL;DR: Results of laboratory studies indicated that DEHP was removed from aqueous phase via biodegradation, adsorption by vermiculite, and adsorptive effect of these three reactions enhanced the overall DEHP removal efficiency.
32 citations
TL;DR: In this article, the removal process of Zn2+/Cu2+ binary solutions using expanded vermiculite as alternative adsorbent was evaluated in dynamic systems to evaluate the influence of operating flow rate, adsorbate initial concentration and molar fraction on the adsorption process.
32 citations
TL;DR: In this paper, the authors studied a deep profile on gneiss from Malaysia and found that the alteration of biotite to halloysite takes place within a few centimeters of the fresh rock (at 18.5 m depth).
32 citations