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Preparation and characterization of a novel silica aerogel as adsorbent for toxic organic compounds
Liu, Huijuan; Sha, Wei; Cooper, Adrienne T.; Fan, Maohong
2009
Conference Name5th International Conference on Interfaces Against Pollution
Conference DateJUN 01-04, 2008
Conference PlaceKyoto, JAPAN
ISSN0927-7757
Department环境水质学国家重点实验室
AbstractHydrophobic and hydrophilic silica aerogels were prepared from cheap waterglass precursors via surface modification of wet gels, ambient pressure drying (APD) route and calcination treatment. Xerogel was also synthesized as a comparison to test the influence of microstructure on the adsorption behaviours. Ethanol (EtOH)/chlorotrimethylsilane (TMCS)/hexane solution was employed to replace the surface silanol groups (Si-OH) with alkyl, and to prevent the condensation and shrinkage of the gel structure during the APD process. The synthesized silica aerogels, characterized by using Fourier transform infrared spectra (FTIR), nitrogen adsorption/desorption measurement, element analyses and differential scanning calorimeter (DSC), etc., are porous and translucent solids with surface area of 546-907 m(2)/g. The transition temperature from hydrophobic to hydrophilic was tested around 395 degrees C, which corresponds to the disappearance temperature of the -CH(3) peaks in FTIR. The materials were tested for adsorption capacities on rhodamine B (RhB) and dieldrin, which represented soluble and slightly soluble organic compounds, respectively. Results showed that the hydrophobic silica aerogel exhibited strong adsorption capacity on slightly soluble organic compounds while hydrophilic silica aerogel was much more effective on adsorbing soluble compounds from aqueous Solution. Adsorption properties of the silica aerogel remain stable after 5 adsorption/desorption cycles. (C) 2008 Elsevier B.V. All rights reserved.
KeywordSilica Aerogel Ambient Drying Adsorbent Toxic Organic Compounds
DOI10.1016/j.colsurfa.2008.11.033
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Document Type会议论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/24675
Collection环境水质学国家重点实验室
Recommended Citation
GB/T 7714
Liu, Huijuan,Sha, Wei,Cooper, Adrienne T.,et al. Preparation and characterization of a novel silica aerogel as adsorbent for toxic organic compounds[C],2009.
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