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

Author： Guimarães J.L. Peralta-Zamora P. Wypych F.

ISSN： 0021-9797

Source： Journal of Colloid and Interface Science, Vol.206, Iss.1, 1998-10, pp. : 281-287

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Abstract

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.