Intercalation of Hexylamine into Hydrated Kaolinite Phenylphosphonate

✍ Scribed by José Luis Guimarães; Carlos Jorge da Cunha; Fernando Wypych

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 74 KB
• Volume: 218
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1999.6336

✦ Synopsis

Hydrated kaolinite phenylphosphonate (KPP-hyd) was reacted with hexylamine under ambient conditions. The reaction produced a stable light-yellow compound (KPP-hex) that was isolated and characterized by X-ray diffraction, thermal methods (simultaneous thermogravimetric and differential scanning calorimetric analysis), Fourier transform infrared spectroscopy, and elemental CHN analysis. The increase in the interlayer distance from 15.02 to 16.36 Å on going from KPP-hyd to KPP-hex was attributed to the replacement of water molecules with the longer hexylamine molecules in the phenylphosphonate P-O-H binding sites of the grafted KPP host. Upon heating, the phase KPP-hex release the hexylamine molecules that burn. The resulting KPP-dry is stable up to 498°C, at which temperature the grafted phenylphosphonate begins to burn and the dehydroxilation of kaolinite takes place.