ENVR 33 |
| Zero-valent iron nano particles (INP) were synthesized and stabilized with poly-acrylic acid to yield stabilized INP (S-INP). A two-dimensional physical model is developed and used to study the transport of these nano materials such as pristine INP and S-INP in a porous media under saturated conditions at fixed flow rates and initial concentration of nano materials. Transport data for INP, S-INP and a non-reactive tracer were collected under similar flow conditions. The results show that the transport of S-INP was the same as trace whereas bare INP did not show transport characteristics. Interestingly, it was observed that the S-INP plume migrated downwards as it transited horizontally in the physical model, indicating that the density of the suspension affected the transport of S-INP. The variable-density groundwater flow model SEAWAT was used to model the observed density-driven transport patterns. The data clearly show the importance of density effects, which cannot be fully discerned using one-dimensional column experimental setups. Finally, we have also shown that the numerical model SEAWAT can be used to predict the density-driven transport characteristics of S-INP in groundwater aquifers. |
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Environmental Behavior and Fate of Manufactured Nanomaterials
1:30 PM-5:35 PM, Sunday, April 6, 2008 Morial Convention Center -- Rm. 235, Oral
Division of Environmental Chemistry |