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 article, the zeta potential values of vermiculite were measured to determine the effect of pH, clay concentration, and various mono-and multivalent electrolytes including NaCl, KCl, NH4Cl, NaNO3, NaClO4, Na2SO4 and Na2CO3.
Abstract: In this study, the zeta potential values of vermiculite and expanded vermiculite were measured to determine the effect of pH, clay concentration, and various mono- and multivalent electrolytes including NaCl, KCl, NH4Cl, NaNO3, NaClO4, Na2SO4, Na2CO3, Na3PO4·12H2O, MgCl2·6H2O, CaCl2·2H2O, BaCl2, SrCl2·6H2O, CuCl2·2H2O, CoCl2·6H2O, NiCl2, AlCl3, and CrCl3·6H2O on the electrokinetic properties of vermiculite samples. It was found that generally the measured zeta potential values of expanded vermiculite for the studied systems were slightly more negative than that of vermiculite. The pH profiles of vermiculite and expanded vermiculite at acidic, natural, and basic pH values were obtained to determine the effect of time on the pH values of clay suspensions. The zeta potential measurements showed that the surface charge of clay particles was negative in water. The isoelectric point of vermiculite and expanded vermiculite were determined as pH 2.30 and 2.57, respectively. Divalent cations (Mg2+, Ca2+, ...
61 citations
TL;DR: In this article, the exfoliation characteristics of Karakoc phlogopite (KP), Phalaborwa phlogoplite (PP), and Phalabwa vermiculite (PV) with hydrogen peroxide were investigated.
60 citations
TL;DR: In this paper, the thermal properties of spray-coated fly ash-based geopolymer have been studied and water added into a starting mixture to increase the flow ability also decreased the geopolymersisation reaction, and fine and coarse-milled vermiculite powder was added at 10 mass percent.
Abstract: Thermal properties (DTA-TG and thermal expansion) of spray-coated fly ash-based geopolymer have been studied. The geopolymer composition selected for thermal spray coating had Si:Al = 3.3 and Na:Al = 1.45. To improve the fire resistant characteristics, fine- and coarse-milled vermiculite powder was added at 10 mass percent. Water:geopolymer ratios varied from 0.35 to 0.41 depending on vermiculite content and method of coating. Water added into a starting mixture to increase the flow ability also decreased the geopolymerisation reaction.
60 citations
TL;DR: In this article, the authors used powder and polarized extended X-ray absorption fine structure (EXAFS) spectroscopy and near-edge spectrograms (XANES) to investigate Cu sorbed on Llano vermiculite and compare the results to reported Cu sorption mechanism on Wyoming (WY) smectite and reduced South African (SA) vermiculate.
60 citations
TL;DR: In this work the performance of a Membrane bioreactor (MBR) was assessed for the removal of copper, lead, nickel and zinc from wastewater.
60 citations