Abstract
New application of modified silica aerogel nanoparticles was carried out for adsorption of Vietnamese spilled crude oil obtained from Bach-Ho field. The aerogel was synthesized by atmospheric drying method without critical extraction procedure in liquefied CO2 followed by surface modification using polydimethylsiloxane precursor in n-hexane solvent. The synthesis mixture contained precise amounts of water, tetraethyl orthosilicate (TEOS), ethanol and HCl with volume ratios of 2:1:4:0.0003, respectively. The modification was established by the mixing of the as-synthesized aerogel and polydimethylsiloxane followed by calcination at 350 oC for 4 h obtaining the surface modified aerogel. The modified aerogel was applied in the adsorption of the spilled crude oil in mild temperature and atmospheric pressure. Some techniques such as X-ray diffraction (XRD), transmission electron microscopy (TEM), Brunauer-Emmett-Teller surface area analysis (BET) and Fourier transform infrared spectroscopy (FTIR) were used for characterizing the materials.
Highlights
Silica aerogel is the most common type of aerogel, and the most extensively studied and used
Surface modification of silica aerogel nanoparticles A mixture including 1 g of silica aerogel and 0.2 g of polydimethylsiloxane was prepared, it was homogeneously diffused in 50 mL n-hexane under vigorous stirring at ambient temperature
The silica aerogel nanoparticles before and after surface modification were characterized by X-ray diffraction (XRD) method
Summary
Silica aerogel is the most common type of aerogel, and the most extensively studied and used. The process was typically done by exchanging the initial aqueous pore liquid for a CO2-miscible liquid such as ethanol or acetone, onto liquid carbon dioxide and bringing the carbon dioxide above its critical point.[1] Up to now, many processes were invented and applied to produce silica aerogels mainly focusing at different treatment of the drying process. There were methods such as supercritical drying, ambient pressure drying and freeze drying.
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