Can Pickering emulsion formation aid the removal of creosote DNAPL from porous media?
Torres, Luis, Iturbe, Rosario, Snowden, M. J., Chowdhry, B. Z. and Leharne, Stephen (2007) Can Pickering emulsion formation aid the removal of creosote DNAPL from porous media? Chemosphere, 71 (1). pp. 123-132. ISSN 0045-6535 (doi:10.1016/j.chemosphere.2007.09.053)Full text not available from this repository.
The purpose of this investigation was to examine the proposition that creosote, emplaced in an initially water saturated porous system, can be removed from the system through Pickering emulsion formation. Pickering emulsions are dispersions of two immiscible fluids in which coalescence of the dispersed phase droplets is hindered by the presence of colloidal particles adsorbed at the interface between the two immiscible fluid phases. Particle trapping is strongly favoured when the wetting properties of the particles are intermediate between strong water wetting and strong oil wetting. In this investigation the necessary chemical conditions for the formation of physically stable creosote-in-water emulsions protected against coalescence by bentonite particles were examined. It was established that physically stable emulsions could be formed through the judicious addition of small amounts of sodium chloride and the surfactant cetyl-trimethylammonium bromide. The stability of the emulsions was initially established by visual inspection. However, experimental determinations of emulsion stability were also undertaken by use of oscillatory rheology. Measurements of the elastic and viscous responses to shear indicated that physically stable emulsions were obtained when the viscoelastic systems showed a predominantly elastic response to shearing. Once the conditions were established for the formation of physically stable emulsions a "proof-of-concept" chromatographic experiment was carried out which showed that creosote could be successfully removed from a saturated model porous system. (C) 2007 Elsevier Ltd. All rights reserved.
|Additional Information:|| First available online: 7 November 2007.  First published in print: March 2008.  Published as: Chemosphere, (2008), Volume 71, Issue 1, pp. Pages 123–132.|
|Uncontrolled Keywords:||Pickering emulsion, creosote, remediation, porous media|
|Subjects:||Q Science > QD Chemistry|
|Faculty / Department / Research Groups:||Faculty of Engineering & Science > Department of Life & Sports Sciences
Faculty of Engineering & Science > Department of Pharmaceutical, Chemical & Environmental Sciences
|Last Modified:||05 Dec 2016 16:57|
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