Preparation of Silica Aerogel and Its Adsorption Performance to Organic Molecule
Hydrophobic and lipophilic silica aerogel was prepared from water-glass by gelling, aging, silylation, and drying under atmospheric pressure and characterized by FT-IR and SEM. The effect of preparation process on aerogel density and the aerogel density on contact angle of water on it were investiga...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2014/850420 |
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| author | Hong-xin Shi Jing-tao Cui Hai-min Shen Hong-ke Wu |
| author_facet | Hong-xin Shi Jing-tao Cui Hai-min Shen Hong-ke Wu |
| author_sort | Hong-xin Shi |
| collection | DOAJ |
| description | Hydrophobic and lipophilic silica aerogel was prepared from water-glass by gelling, aging, silylation, and drying under atmospheric pressure and characterized by FT-IR and SEM. The effect of preparation process on aerogel density and the aerogel density on contact angle of water on it were investigated in detail. pH 6 is most beneficial to shorten gelling time and to obtain the lowest density of silica aerogel. Increasing TEOS concentration of aging solution to 25 v% could decrease aerogel density to 0.093 g/cm3. The silica aerogel exhibits good hydrophobicity even though its density is 0.30 g/cm3. There are few changes in their adsorption capacities after 3 cycles of adsorption-desorption. The adsorption performance of the silica aerogel to organic solvent in water is different from in pure solvents. The critical surface tension (γC) of the silica aerogel prepared here is about 30.8 mN/m. If the surface tension of aqueous solvent solution (γ) is greater than γC, it will wet the aerogel surface partially. If γ ≤ γC, the solution will wet all aerogel surface and be adsorbed well. This work delivers us a method to adsorb solvents from their waste water by adjusting the surface tension of the waste water to lower than γC of the adsorbent. |
| format | Article |
| id | doaj-art-8f336d47e9844d92b7ed0ac40609df91 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-8f336d47e9844d92b7ed0ac40609df912025-02-03T00:59:35ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422014-01-01201410.1155/2014/850420850420Preparation of Silica Aerogel and Its Adsorption Performance to Organic MoleculeHong-xin Shi0Jing-tao Cui1Hai-min Shen2Hong-ke Wu3State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou 310032, ChinaState Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou 310032, ChinaState Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou 310032, ChinaState Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou 310032, ChinaHydrophobic and lipophilic silica aerogel was prepared from water-glass by gelling, aging, silylation, and drying under atmospheric pressure and characterized by FT-IR and SEM. The effect of preparation process on aerogel density and the aerogel density on contact angle of water on it were investigated in detail. pH 6 is most beneficial to shorten gelling time and to obtain the lowest density of silica aerogel. Increasing TEOS concentration of aging solution to 25 v% could decrease aerogel density to 0.093 g/cm3. The silica aerogel exhibits good hydrophobicity even though its density is 0.30 g/cm3. There are few changes in their adsorption capacities after 3 cycles of adsorption-desorption. The adsorption performance of the silica aerogel to organic solvent in water is different from in pure solvents. The critical surface tension (γC) of the silica aerogel prepared here is about 30.8 mN/m. If the surface tension of aqueous solvent solution (γ) is greater than γC, it will wet the aerogel surface partially. If γ ≤ γC, the solution will wet all aerogel surface and be adsorbed well. This work delivers us a method to adsorb solvents from their waste water by adjusting the surface tension of the waste water to lower than γC of the adsorbent.http://dx.doi.org/10.1155/2014/850420 |
| spellingShingle | Hong-xin Shi Jing-tao Cui Hai-min Shen Hong-ke Wu Preparation of Silica Aerogel and Its Adsorption Performance to Organic Molecule Advances in Materials Science and Engineering |
| title | Preparation of Silica Aerogel and Its Adsorption Performance to Organic Molecule |
| title_full | Preparation of Silica Aerogel and Its Adsorption Performance to Organic Molecule |
| title_fullStr | Preparation of Silica Aerogel and Its Adsorption Performance to Organic Molecule |
| title_full_unstemmed | Preparation of Silica Aerogel and Its Adsorption Performance to Organic Molecule |
| title_short | Preparation of Silica Aerogel and Its Adsorption Performance to Organic Molecule |
| title_sort | preparation of silica aerogel and its adsorption performance to organic molecule |
| url | http://dx.doi.org/10.1155/2014/850420 |
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