期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 47, 期 9, 页码 4255-4261出版社
AMER CHEMICAL SOC
DOI: 10.1021/es400138c
关键词
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资金
- National Science Foundation Graduate Research Fellowship [DGE-0813967]
- University of California Center for the Environmental Implications of Nanotechnology (UC-CEIN)
- National Science Foundation and Environmental Protection Agency [DBI-0830117]
- USDA HSI [2010-02025]
- NSF Career Award [0954130]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0954130] Funding Source: National Science Foundation
A transport study was performed in saturated porous media through a packed bed column to simulate fate of graphene oxide nanoparticles (GONPs) in the subsurface environment. Transport experiments, along with mass balances and column dissections, were conducted as a function of ionic strength (IS, 10(-3)-10(-1) M). Additionally, an extensive evaluation of the electrokinetic properties and hydrodynamic diameters of GONPs were determined as a function of IS and pH. The measured hydrodynamic diameter and the electrophoretic mobility (EPM) of GONPs indicated an insensitivity to pH, although IS did play a role. Results from a stability study indicated that the hydrodynamic diameter of GONPs was stable and unchanging at the lower range of IS (10(-3) and 10(-2) M) then became unstable when IS >= 10(-1.5) M KCl was achieved. Specifically, for IS >= 10(-1.5) M KCI, the hydrodynamic diameter became greater and showed a larger size range of particles than at the lower IS range (10(-3) and 10(-2) M). In addition, the EPM of GONPs became less negative over the IS range of 10(-3) and 10(-2) M KCl. Furthermore, GONPs were found to be increasingly mobile for IS <= 10(-2) M KCl. When GONPs were passed through the packed bed column at 10(-2) and 10(-1) M KCl, 5% and 100% of the GONPs were retained in the column, respectively. Finally, mass balances and column dissections revealed that in the first cm of the column 7% and 95% of the GONPs were deposited at 10(-2) and 10(-1) M KCl, respectively, confirming that the transport of GONPs is a function of IS. The fraction of GONPs eluted during the transport experiments provides insight into the contribution of aggregation and reversibly bound fraction of GONPs in saturated porous media.
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