4.7 Article

Adsorption and desorption performance of benzene over hierarchically structured carbon-silica aerogel composites

Journal

JOURNAL OF HAZARDOUS MATERIALS
Volume 196, Issue -, Pages 194-200

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2011.09.019

Keywords

Carbon-silica aerogel composites; VOCs; Adsorption and desorption; Micro/mesoporous structure

Funding

  1. Beijing Municipal Commission of Education
  2. National Natural Science Foundation of China [20725723, 20807050]
  3. National Basic Research Program of China [2010CB732300]

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Hierarchically structured carbon-silica aerogel (CSA) composites were synthesized from cheap water glass precursors and granulated activated carbon via a post-synthesis surface modification with trimethylchlorosilane (TMCS) and a low-cost ambient pressure drying procedure. The resultant CSA composites possess micro/mesoporous structure and hydrophobic surface. The adsorption and desorption performance of benzene on carbon-silica aerogel composite (CSA-2) under static and dynamic conditions were investigated, comparing with pure silica aerogel (CSA-0) and microporous activated carbon (AC). It was found that CSA-2 has high affinity towards aromatic molecules and fast adsorption kinetics. Excellent performance of dynamic adsorption and desorption observed on CSA-2 is related to its higher adsorption capacity than CSA-0 and less mass transfer resistance than AC, arising from the well-developed microporosity and open foam mesostructure in the CSA composites. (C) 2011 Elsevier B.V. All rights reserved.

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