SNL  Vol.1 No.4 , October 2011
Potential Application of Silica Aerogel Granules for Cleanup of Accidental Spillage of Various Organic Liquids
ABSTRACT
The experimental work has been carried out to study the absorption-desorption properties of the silica aerogels, for their use in oil spill cleanup application. For these studies, silica aerogel granules were prepared by two step acid– base catalyzed sol–gel process, involving ambient pressure drying of alcogels, were made use for absorption & desorption studies of different organic liquids. The optimal molar ratio of precursors tetraethoxysilane (TEOS):Methanol (MeOH):Oxalic acid:NH4OH:NH4F:trimethylchlorosilane (TMCS) was kept constant at 1:16.5:0.71:0.58:0.60:0.98, respectively. In all, four alkanes, four aromatic compounds, four alcohols and three oils were used for absorption and desorption studies of organic liquids. The absorption capacity of aerogel sample was quantified by measuring the mass of the organic liquid absorbed by unit mass of the aerogel sample. The hydrophobic aerogel granules showed a very high uptake capacity and high rate of uptake. The desorption of solvents and oils was studied by keeping the liquid absorbed aerogel granules at various temperatures and weighing them at regular time intervals until all the absorbed liquid got totally desorbed. The Fourier transform infrared spectroscopy analysis showed that the aerogel structure was not much affected by the solvent absorption, while the oil absorption led to the shrinkage, resulting in a dense structure after desorption.

Cite this paper
nullV. Parale, D. Mahadik, M. Kavale, A. Rao, P. Wagh and S. Gupta, "Potential Application of Silica Aerogel Granules for Cleanup of Accidental Spillage of Various Organic Liquids," Soft Nanoscience Letters, Vol. 1 No. 4, 2011, pp. 97-104. doi: 10.4236/snl.2011.14017.
References
[1]   A. Bayat, S. F. Aghamiri, A. Moheb and G. R. Vakili- Nezhaad, “Oil Spill Cleanup from Sea Water by Sorbent Materials,” Chemical Engineering Technology, Vol. 28, 2005, pp. 1525-1528. doi:10.1002/ceat.200407083

[2]   M. Fingas, “Oil Spills and Their Cleanup,” Chemical In- dustry, Vol. 24, 1995, pp. 1005-1008.

[3]   A. Bieser, “The Mainstream of Physics,” Second Edition, Addison Wesley Publishing Company Inc., 1962.

[4]   R. D. Delaune, C. W. Lindau and A. Jugsujinda, “Effec- tiveness of Nochar Solidifier Polymer in Removing Oil from Open Water in Coastal Wetlands,” Spill Science Technology Bulletin, Vol. 5, 1999, pp. 357-359. doi:10.1016/S1353-2561(99)00081-X

[5]   C. H. Teas, S. Kalligeros, F. Zanikos, S. Stoumas, E. Lois and G. Anastopoulos, “Investigation of the Effectiveness of Absorbent Materials in Oil Spills Clean up,” Desali- nation, Vol. 140, No. 3, 2001, pp. 259-264. doi:10.1016/S0011-9164(01)00375-7

[6]   J. W. Doerffer, “Oil Spill Response in the Marine Environment,” First Edition Pergamon Press, Oxford, 1992.

[7]   R. R. Lessard and G. Demarco, “The Significance of Oil Dispersants,” Spill Science Technology Bulletin, Vol. 6, No. 1, 2000, pp. 59-68. doi:10.1016/S1353-2561(99)00061-4

[8]   N. Hering, K. Schriber, R. Riedel, O. Lichtenberger and J. Woltersodorf, “Synthesis of Polymeric Precursors for the Formation of Nanocrystalline Ti-C-N/Amorphous Si-C-N Composites,” Applied Organometallic Chemistry, Vol. 15, No. 10, 2001, pp. 879-886. doi:10.1002/aoc.241

[9]   A. V. Rao, N. D. Hegade, H. Hirashima, “Absorption and Desorption of Organic Liquids in Elastic Superhydro- phobic Silica Aerogels,” Journal Colloids and Interface Science, Vol. 305, No. 1, 2007, pp. 124-132. doi:10.1016/j.jcis.2006.09.025

[10]   M. O. Adebajo, R. L. Frost, J. T. Kloprogge, O. Carmody and S. Kokot, “Porous Materials for Oil Spill Cleanup: A Review of Synthesis and Absorbing Properties,” Journal of Porous Materials, Vol. 10, No. 3, 2003, pp. 159-170. doi:10.1023/A:1027484117065

[11]   J. L. Gurav, A. V. Rao, D. Y. Nadargi and H. H. Park, “Ambient Pressure Dried TEOS-Based Silica Aerogels: Good Absorbents of Organic Liquids,” Journal of Mate- rial Science, Vol. 45, 2010, pp. 503-510. doi:10.1007/s10853-009-3968-8

[12]   D. B. Mahadik, A. V. Rao, A. P. Rao, P. B. Wagh, S. V. Ingale and S. C. Gupta, “Effect of Concentration of Trimethylchlorosilane (TMCS) and Hexamethyldisilaza- ne (HMDZ) Sylilating Agents on Surface Free Energy of Silica Aerogels,” Journal Colloids and Interface Science, Vol. 356, No. 1, 2011, pp. 298-302. doi:10.1016/j.jcis.2010.12.088

[13]   K. Sinko, “Influence of Chemical Conditions on the Nano- Porous Structure of Silicate Aerogels,” Materials, Vol. 3, No. 1, 2010, pp. 704-740. doi:10.3390/ma3010704

[14]   A. V. Rao, S. D. Bhagat, H. Hirashima and G. M. Pajonk, “Synthesis of Flexible Silica Aerogels Using Methyltrime- thoxysilane (MTMS) Precursor,” Journal Colloids and Interface Science, Vol. 300, No. 1, 2006, pp. 279-285.

[15]   P. M. Shewale, A. V. Rao and A. P. Rao, “Effect of Different Trimethyl Silylating Agents on the Hydrophobic and Physical Properties of Silica Aerogels,” Journal of Applied Surface Science, Vol. 254, No. 21, 2008, pp. 6902-6907.

[16]   D. B. Mahadik, A. V. Rao, R. Kumar, S. V. Ingale, P. B. Wagh and S. C. Gupta, “Reduction of Processing Time by Mechanical Shaking of the Ambient Pressure Dried TEOS Based Silica Aerogels,” Journal of Porous Mate- rials, Article in Press.

[17]   A. P. Rao and A. V. Rao, “Modifying the Surface Energy and Hydrophobicity of the Low-Density Silica Aerogels through the Use of Combinations of Surface-Modification Agents,” Journal of Material Science, Vol. 45, 2010, pp. 51-63. doi:10.1007/s10853-009-3888-7

[18]   F. H. Newman and V. H. L. Searle, “The General Properties of Matter,” 5th Edition, Orient Longmans, London, 1957.

[19]   T. Dand-Vu, J. Hupka and J. Drzymala, “Impact of Roughness on Hydrophobicityof Particles Measured by the Washburn Method,” Physicochemical Problems of Mineral Processing, Vol. 40, 2006, pp. 45-52.

[20]   P. M. Shewale, A. V. Rao, A. P. Rao and S. D. Bhagat, “Synthesis of Transparent Silica Aerogels with Low Density and Better Hydrophobicity by Controlled Sol-Gel Route and Subsequent Atmospheric Pressure Drying,” Journal Sol-Gel Science and Technology, Vol. 49, No. 3, 2009, pp. 285-292.

[21]   A. V. Rao, M. M. Kulkarni and S. D. Bhagat, “Transport of Liquids Using Superhydrophobic Aerogels,” Journal Colloids and Interface Science, Vol. 285, No. 1, 2005, pp. 413-418.

[22]   N. D. Hegde and A. V. Rao, “Physical Properties of Methyltrimethoxysilane Based Elastic Silica Aerogels Prepared by the Two Step Sol-Gel Process,” Journal of Material Science, Vol. 42, No. 16, 2007, pp. 6965-6971. doi:10.1007/s10853-006-1409-5

[23]   A. V. Rao and R. R. Kalesh, “Organic Surface Modification of TEOS Based Silica Aerogels Synthesized by Co- precursor and Derivatization Methods,” Journal Sol-Gel Science and Technology, Vol. 30, 2004, pp. 141-147. doi:10.1023/B:JSST.0000039498.61813.9e

 
 
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