Modification of Perlite for Use...

Published: Journal of Chromatographic Science, Volume 36, Number 10, October 1998, pp. 499-504.

Modification of Perlite for Use as a Thin-Layer Chromatographic Adsorbent
R. Karakas and U. Yukse

The SiO₂ content (70–75%) of mineral perlite is converted to soluble silicates with Na₂CO₃. The acidification of soluble silicates in perlite forms hydrogels which become xerogels upon drying. The parameters (particle size, specific surface area, pore size and volume, and surface hydroxyl group density) are investigated for perlite modified by Na₂CO₃ before use as a thin-layer chromatography adsorbent. The modified perlite is mixed with CaSO₄ (a binder) and Na₄SiO₄ in order to adjust the pH of its 10% suspension in water before its application to the glass surface. The modified perlite (having CaSO₄ and Na₄SiO₄) is called “Perlite IIG7”. Layers prepared with Perlite IIG7 are successfully used for the separation of the dye component in commercially available inks, amino acids, carboxylic acids, mono- and disaccarides, and halide ions.

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