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Silica aerogels and their application for adsorption [Elektronski vir]
Novak, Zoran ; Štandeker, Suzana ; Knez, Željko
Silica monolith aerogels with different degrees of hydrophobicity were prepared bu incorporating methyltrimethoxysilane MTMS or trimethylethoxysilane TMES in standard sol-gel synthesis. Excellent ...properties of aerogels, obtained with the sol-gel synthesis, were preserved with supercritical drying with CO2. The degree of hydrophobicity of aerogels was tested by measuring the contact angle of a water droplet with the aerogel surface. The pore texture and BET surface areas of aerogels were determined by nitrogen physisorption. Adsorption capacity measurements show that silica aerogels are excellent adsorbents for different compounds dependent on its degree of hydrophobicity. Hydrophilic silica aerogels are shown to be better adsorbents of water moisture and vapours of volatile organic compounds from air than conventional absorbents. On the other hand, it was proved for hydrophobic silica aergels that they are efficient adsorbents of organic solvents from water.
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