Dynamic adsorption of volatile organic compounds on organofunctionalized SBA-15 materials

Hu, Qin, Li, Jin Jun, Li, Lan Dong, Hao, Zheng Ping and Qiao, Shi Zhang (2009) Dynamic adsorption of volatile organic compounds on organofunctionalized SBA-15 materials. Chemical Engineering Journal, 149 1-3: 281-288. doi:10.1016/j.cej.2008.11.003


Author Hu, Qin
Li, Jin Jun
Li, Lan Dong
Hao, Zheng Ping
Qiao, Shi Zhang
Title Dynamic adsorption of volatile organic compounds on organofunctionalized SBA-15 materials
Journal name Chemical Engineering Journal   Check publisher's open access policy
ISSN 1385-8947
1873-3212
Publication date 2009-07-01
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.cej.2008.11.003
Open Access Status
Volume 149
Issue 1-3
Start page 281
End page 288
Total pages 8
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Language eng
Subject C1
0904 Chemical Engineering
Abstract Organofunctionalized SBA-15 materials, including methyl-SBA-15 and phenyl-SBA-15, were synthesized by co-condensation method of tetraethyl orthosilicate (TEOS) and organosilanes such as methyltriethoxysilane (MTES) and phenyltriethoxysilane (PTES) under acidic conditions, and used as adsorbents for the VOCs abatement. These adsorbents were characterized by powder X-ray diffraction, N2 adsorption/desorption isotherms and FT-IR spectroscopy techniques. The results indicated that all samples showed a highly ordered two dimensional hexagonal mesostructure and the organic groups were chemically incorporated into the pore surface of SBA-15 substrate. The dynamic adsorption behaviors of single VOC component (benzene) on methyl-SBA-15 and phenyl-SBA-15 adsorbents were evaluated via breakthrough curves. It was found that the adsorbent with the PTES/TEOS molar ratio at 1:10 had the largest capacity (0.650 mmol/gadsorbent) in the single component dynamic adsorption and the phenyl groups had stronger attractive interaction with benzene than the methyl groups. A mathematical model for the organofunctionalized SBA-15 adsorbents was successfully employed to describe the adsorption breakthrough curves of benzene. For binary component adsorption, the phenyl-SBA-15 exhibited the π-electrons effect between the adsorbate and the adsorbent, as the phenyl-SBA-15 materials preferred to adsorb benzene to cyclohexane. The larger dynamic VOCs capacity of the organofunctionalized SBA-15 materials was attributed to the synergetic effect between the amount of organic groups and the total pore volume.
Keyword Bicomponent adsorption
Mathematical model
Breakthrough curves
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID 20725723
2006AA06A310
Institutional Status UQ

 
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Created: Fri, 05 Jun 2009, 23:15:46 EST by Siona Saplos on behalf of Office of Sponsored Research