PREPARATION OF KAOLINITE-AMINO ACID INTERCALATES DERIVED FROM HYDRATED KAOLINITE
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dc.contributor.author | Sato M. | |
dc.date.accessioned | 2021-01-14T11:10:11Z | |
dc.date.available | 2021-01-14T11:10:11Z | |
dc.date.issued | 1999 | |
dc.identifier | https://elibrary.ru/item.asp?id=27937257 | |
dc.identifier.citation | Clays and Clay Minerals, 1999, 47, 6, 793-802 | |
dc.identifier.issn | 0009-8604 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/23041 | |
dc.description.abstract | Intercalation of amino acids into 10.0-A hydrated kaolinite was studied by powder X-ray diffraction (XRD), differential thermal analysis-thermal gravimetry (DTA-TG), and infrared (IR) spec-troscopy. Intercalation was found to be dependent on the chain-length, pH, and the concentration of the amino acid zwitterion. Near the isoelectric point, fully intercalated phases were obtained in solutions of concentration >0.5-1 M for glycine (Gly), 2-3 M for 13-alanine ({3-Ala), and 12 M for both ",/-aminobutyric acid ('y-Aba) and g-aminovaleric acid (g-Ava). e-aminocaproic acid (e-Aca) with a long chain (C = 6) was only partially intercalated. Intercalated amino acid formed a mono-molecular arrangement with the alkyl chain tilting toward the layer at an angle related to H20 content. The compositions of the intercalates of the Gly and [3-Ala are AlzSi2Os(OH)4-(Gly)0.67.0.24H20 and AIzSi2Os(OH)4.([~-Ala)0.63.0.25H20, respec-tively, based on TG data. From IR data, Gly and [3-Ala molecules are found intercalated as zwitterions and these molecules form hydrogen bonds with both the A1-OH and Si-O surfaces of kaolinite. Washing the intercalate with water produced a hydrated kaolinite, which may form a second amino-acid intercalate of high order. Thus, hydrated kaolinite intercalates or deintercalates amino acids depending on concen-tration and conditions. | |
dc.title | PREPARATION OF KAOLINITE-AMINO ACID INTERCALATES DERIVED FROM HYDRATED KAOLINITE | |
dc.type | Статья |
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