Covalent Grafting of Phenylphosphonate Groups onto the Interlamellar Aluminol Surface of Kaolinite

Kaolinite (K) was reacted with phenylphosphonic acid (PPA) in a water:acetone (1:1 V/V) solution (molar ratio 1 K:3 PPA), at 95 ± 5°C for different periods of time. Two different compounds (white powders) were identified but only one was isolated as a single phase and characterized by X-ray diffract...

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Published in:Journal of colloid and interface science 1998-10, Vol.206 (1), p.281-287
Main Authors: Guimarães, José Luis, Peralta-Zamora, Patricio, Wypych, Fernando
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
interlamellar modification
kaolinite
organo-clay
Solid-liquid interface
Surface physical chemistry
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description Kaolinite (K) was reacted with phenylphosphonic acid (PPA) in a water:acetone (1:1 V/V) solution (molar ratio 1 K:3 PPA), at 95 ± 5°C for different periods of time. Two different compounds (white powders) were identified but only one was isolated as a single phase and characterized by X-ray diffraction (powder method), thermal analysis (TG-DSC), Fourier-transformed infrared spectroscopy, and chemical analysis. The first compound showed a layer expansion of 7.86 Å and the second, a layer expansion of 9.29 Å, obtained as a decomposition product. Both compounds are consistent with the grafting of the phenylphosphonate group to the layers of kaolinite. The compounds have a formula of Al2Si2O5(OH)(HO3PPh)3.0· 2H2O, as determined by thermal (water and total organic matter loss) and chemical (C content) analysis, respectively.
doi_str_mv 10.1006/jcis.1998.5728
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subjects Chemistry
Exact sciences and technology
General and physical chemistry
interlamellar modification
kaolinite
organo-clay
Solid-liquid interface
Surface physical chemistry
title Covalent Grafting of Phenylphosphonate Groups onto the Interlamellar Aluminol Surface of Kaolinite
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