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- W2022101373 abstract "Abstract The Kutahya calcium bentonite (CaB) from Turkey shows significant changes in crystal structure, chemical composition and porosity with H 2 SO 4 activation realized by heating its acidic aqueous suspension at 97 °C for 6 h. The acid content was changed from zero to 70% by mass, based on the dry bentonite–acid mixture. It was estimated from chemical analysis (CA) and X-ray diffraction (XRD) data that the CaB contains 65% calcium montmorillonite (CaM) and 30% opal-CT (OCT) by mass, and also illite (I) and other impurities in lower extents. The decrease in crystallinity of the CaM by the activation was discussed as regards to the decrease in the relative intensity ( I / I 0 ) and increase in the full width at half-maximum peak height (FWHM) of the 001 XRD peak for CaM with the H 2 SO 4 %. The CA data reveals that the relative content of the undissolved cations in the CaB increase in the order of Ca 2+ , Na + , Mg 2+ , Fe 2+,3+ , Al 3+ , K + , Si 4+ , and Ti 4+ with H 2 SO 4 %. The specific micropore volume ( V mi ) and specific mesopore volume ( V me ) of the samples were estimated from N 2 -adsorption and desorption data, by standard methods. The V me shows a ‘zig-zag’ increase from 0.104 cm 3 g − 1 to a maximum of 0.232 cm 3 g − 1 at 40% and then decrease to 0.149 cm 3 g − 1 at 70% H 2 SO 4 , respectively. The V mi increases about from zero to 0.055 cm 3 g − 1 at 10% H 2 SO 4 and then stayed approximately constant." @default.
- W2022101373 created "2016-06-24" @default.
- W2022101373 creator A5039013641 @default.
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- W2022101373 date "2007-03-01" @default.
- W2022101373 modified "2023-10-10" @default.
- W2022101373 title "Preparation and characterization of acid-activated bentonite powders" @default.
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- W2022101373 doi "https://doi.org/10.1016/j.powtec.2006.10.034" @default.
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