Journal article
Effects of Solution Chemistry on the Transport of Graphene Oxide in Saturated Porous Media
Environmental science & technology, v 47(9), pp 4255-4261
07 May 2013
PMID: 23528133
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
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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Details
- Title
- Effects of Solution Chemistry on the Transport of Graphene Oxide in Saturated Porous Media
- Creators
- Jacob D. Lanphere - University of California, RiversideCorey J. Luth - University of California, RiversideSharon L. Walker - University of California, Riverside
- Publication Details
- Environmental science & technology, v 47(9), pp 4255-4261
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 7
- Grant note
- DGE-0813967 / National Science Foundation Graduate Research Fellowship; National Science Foundation (NSF) University of California Center for the Environmental Implications of Nanotechnology (UC-CEIN) DBI-0830117 / National Science Foundation and Environmental Protection Agency 2010-02025 / USDA HSI 0954130 / NSF Career Award; National Science Foundation (NSF); NSF - Office of the Director (OD)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- College of Engineering
- Web of Science ID
- WOS:000318756000039
- Scopus ID
- 2-s2.0-84877617091
- Other Identifier
- 991021229891804721
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- Web of Science research areas
- Engineering, Environmental
- Environmental Sciences