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Preparation of potassium acetate intercalated metakaolinite
Applied Clay Science, 2009Abstract Potassium acetate was intercalated into metakaolinite by grinding. The effect of grinding time, potassium acetate content and heat was investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermal analysis (TG–DSC) and transmission electron microscopy (TEM).
Tao Xu +4 more
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Geopolymerization process of alkali–metakaolinite characterized by isothermal calorimetry
Thermochimica Acta, 2009The geopolymerization process of metakaolinite activated by alkali and alkali silicate solutions was revealed. The effects of alkali concentration, modulus of alkali silicate solution and reaction temperature on geopolymerization were studied systematically by isothermal calorimetry, as well as X-ray diffraction and 27Al/29Si MAS NMR. Results show that
Xiao Yao, Zuhua Zhang
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Preparation of macroporous ceramic from metakaolinite-based geopolymer by calcination
Ceramics International, 2015Abstract Metakaolinite-based geopolymer was prepared using metakaolinite under activation of NaOH solution and sodium silicate solution. The geopolymer was calcined at 300 °C, 600 °C, 900 °C, 1200 °C and 1500 °C. IR, SEM and XRD were used to determine changes on composition, morphology and structure.
Hongling Wang +3 more
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Fracture toughness and fracture surfaces morphology of metakaolinite-modified concrete
Construction and Building Materials, 2016Abstract The authors’ main aim was an in-depth study of the issue of fracture toughness of metakaolinite modified concretes, the problem not investigated to a great extent so far. The results of tests on the fracture toughness of metakaolinite modified concretes have proved that it is higher compared with that of non-modified concretes.
Janusz Konkol
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Preparation of microporous silica from metakaolinite by selective leaching method
Microporous and Mesoporous Materials, 1998Microporous silica was prepared by selective leaching of metakaolinite, derived from the 1:1 layered clay mineral kaolinite (2SiO2Al2O32H2O) by firing at 600 °C for 24 h. Treatment with 20 mass% H2SO4 solution at 90 °C for 0.5–5 h with stirring, led to a decrease in the Al2O3 content and an increase in the specific surface area (SA) with increasing ...
Kiyoshi Okada +5 more
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Uranium sorption from commercial phosphoric acid using kaolinite and metakaolinite
Journal of Radioanalytical and Nuclear Chemistry, 2018Uranium sorption from commercial phosphoric acid was carried out onto kaolinite and metakaolinite. The different factors affecting uranium adsorption have been investigated. The obtained results show that, the sorption process is applicable for the high strength phosphoric acid, 40% P2O5, and diluted phosphoric acid, 20% P2O5, but it preferred to the ...
Mohamed H Taha
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Leachability of the metakaolinite-rich materials in different alkaline solutions
Materials Today Communications, 2019Abstract The leaching behaviour of three metakaolinite-rich materials prepared from granulated kaolin and two kaolinitic claystones in alkaline solutions at room temperature was investigated with the aid of centrifugal separation of clear supernatant from the reaction mixture.
Jan Kohout, Petr Koutník
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Toxic gas removal with kaolinite, metakaolinite, radiolarite, and diatomite
Chemosphere, 2023In this study, some clays and dead microorganisms were compared in terms of their adsorption ability against special toxic gases. To this end, an experimental investigation was conducted to explore the adsorption kinetics of kaolinite, metakaolinite, radiolarite, and diatomite to ammonia (NH3), ethylene (C2H4), and carbon dioxide (CO2).
Abdullah Bayram +2 more
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Characterization of metakaolinite micro-mechanical behaviors using MD simulation
Computational Materials Science, 2021Abstract The mechanical behavior of metakaolinite under nanoindentation and nanoscratching was investigated by means of molecular dynamic (MD) simulations in this study. A 6 nm radius spherical indenter was pressed on the (0 0 1) and 00 1 ¯ basal planes up to a 3.5 nm indentation depth to study the anisotropy of metakaolinite in ...
Yang, Wei +4 more
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The rehydration of metakaolinite to kaolinite
Journal of the Chemical Society, Chemical Communications, 1991The dehydration of kaolinite to metakaolinite can be completely reversed; particles of rehydrated metakaolinite grow perpendicular to the c* axis and their edges are parallel to those of parent metakaolinite and kaolinite, showing that the rehydration is a topotactic solid-state process.
Jo�o Rocha, Jacek Klinowski
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