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

✍ Scribed by José Luis Guimarães; Patricio Peralta-Zamora; Fernando Wypych

Book ID
102581880
Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
155 KB
Volume
206
Category
Article
ISSN
0021-9797

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✦ Synopsis

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 Al 2 Si 2 O 5 (OH)(HO 3 PPh) 3.0 ⅐ 2H 2 O, as determined by thermal (water and total organic matter loss) and chemical (C content) analysis, respectively.

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