Please use this identifier to cite or link to this item:
|Title:||Organic template removal from hexagonal mesoporous silica by means of methanol-enhanced CO2 extraction: Effect of temperature, pressure and flow rate|
Supercritical fluid extraction
|Citation:||Huang, Z., Xu, L., Li, J.-H., Kawi, S., Goh, A.H. (2011-02-02). Organic template removal from hexagonal mesoporous silica by means of methanol-enhanced CO2 extraction: Effect of temperature, pressure and flow rate. Separation and Purification Technology 77 (1) : 112-119. ScholarBank@NUS Repository. https://doi.org/10.1016/j.seppur.2010.11.029|
|Abstract:||Supercritical fluid extraction was evaluated for removing the amine surfactant from hexagonal mesoporous silica materials. In this study, methanol-enhanced supercritical CO2 extraction was carried out on freshly synthesized materials by means of a dynamic method. Experiments were performed at pressure ranging from 10.0 to 25.0 MPa, temperature from 45 to 105 °C, CO2 flow rate from 0.45 to 4.5 ml/min, and methanol flow rate from 0.05 to 0.5 ml/min. The influence of these parameters on the extraction has been evaluated in terms of the surfactant recovery. The results show that by using this method up to 96% of the total amine surfactant used is extracted out of as-synthesized mesoporous materials within 1 h extraction whereas only 78% of the surfactant can be removed by liquid ethanol extraction. The materials processed by supercritical CO2 extraction are found to possess better structural properties as reflected by the X-ray diffraction analysis and N 2 adsorption results, and thus have higher thermal and hydrothermal stability than those obtained by liquid ethanol extraction or high temperature calcination. © 2010 Elsevier B.V. All rights reserved.|
|Source Title:||Separation and Purification Technology|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on May 20, 2018
WEB OF SCIENCETM
checked on Apr 23, 2018
checked on May 11, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.