Experimental and Modeling Investigation of the Transport of Grapheme Oxide within Saturated Sand Packs
Abstract
The transport of Graphene Oxide (GO) within saturated sand packs was examined through a series of column experiments using 1-100 mM NaCl. The retention of GO within saturated quartz sand was found to be strongly dependent on ionic strength. At low ionic strength (e.g., 1 mM), little retention of GO occurred. More than 90% of GO, however, could be retained within the sand packs when ionic strength increased to 100 mM. The transport behavior of GO can be described by the Langmuir-type of model. The extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory, which considers Lifshitz-van der Waals (LW) interaction, the electrostatic double layer (EDL) interaction as well as the Lewis acid-base (AB) (i.e., hydrophobic) interaction between GO plates and the surface of quartz sand could explain the observed trend of GO retention with ionic strength. In summary, our results showed that GO could have high mobility within saturated sand packs under conditions commonly encountered in freshwater environment.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2011
- Bibcode:
- 2011AGUFM.H53B1406X
- Keywords:
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- 1831 HYDROLOGY / Groundwater quality;
- 1832 HYDROLOGY / Groundwater transport