期刊
DALTON TRANSACTIONS
卷 44, 期 10, 页码 4665-4670出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4dt04018j
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资金
- Priority Academic Program Development of the Jiangsu Higher Education Institutions
- National Nature Science Foundation of China [91122011, 21271103]
The intercalated kaolinite with potassium acetate (K-KAc), with ca. 91.9% intercalation ratio, was prepared. Thermogravimetric and variable-temperature X-ray powder diffraction analyses disclosed that a small amount of water is easily absorbed into the interlayer space of the K-KAc. The previously reported phase with the 14.2 angstrom interlayer distance is actually the hydrous K-KAc, which has an approximate formula of Al2Si2O5(OH)(4)center dot 0.5KAc center dot 0.25H(2)O. The crystal structures of hydrous and anhydrous phases of K-KAc were simulated in the density functional theory framework, demonstrating that the interactions between the K+ and acetate ions and the inner surface of kaolinite are significantly strengthened in the anhydrous phase with regard to the hydrous phase. The ionic conductivity of K-KAc indicated that the mobility of the interlayer ions is strongly improved by thermal activation and the conductivity increased by four orders of magnitude from 363 to 423 K.
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