Ambient pressure dried TEOS-based silica aerogels: Good absorbents of organic liquids

Jyoti L. Gurav, A. Venkateswara Rao, D. Y. Nadargi, Hyung Ho Park

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

The experimental work has been carried out to study the absorption-desorption properties of the hydrophobic silica aerogel for the application of oil spill cleanup. Aerogels were synthesized by sol-gel route prior to ambient pressure drying, by keeping TEOS:MeOH:Acidic H 2O:NH4F:NH4OH:HMDZ molar ratio constant at 1:16.5:0.81:0.62:0.63:0.41, respectively. The absorption of organic liquids by as-prepared aerogels has been carried out by adding the aerogel samples in organic liquid, viz. three alkanes: hexane, heptane, octane; the aromatic compounds: benzene, toluene, xylene; the alcohols: methanol, ethanol, propanol, and the three oils: petrol, diesel, and kerosene until it is totally wetted. It was observed that surface-modified TEOS-based aerogel absorbed the organic liquids and oils by nearly 12 times its own mass. After absorption, desorption time of liquids from the aerogel at various temperatures, i.e., at 30, 60, 80, and 100 °C was measured. The 50% volume shrinkage of the aerogel in case of oils and 20% in case of organic liquid was observed, after total desorption of liquids. No significant change in hydrophobicity of the aerogel was observed and it can be reused two times.

Original languageEnglish
Pages (from-to)503-510
Number of pages8
JournalJournal of Materials Science
Volume45
Issue number2
DOIs
Publication statusPublished - 2010 Jan

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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