Journal article
Mechanisms of TiO2 nanoparticle transport in porous media: Role of solution chemistry, nanoparticle concentration, and flowrate
Journal of colloid and interface science, v 360(2), pp 548-555
15 Aug 2011
PMID: 21640358
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The role of solution chemistry, nanoparticle concentration and hydrodynamic effects in the transport and deposition of TiO2 nanoparticles through porous media has been systematically investigated. Two solution chemistry variables, pH and ionic strength (IS), showed a significant influence on the transport due to their involvement in the aggregation of the nanoparticles and interaction with quartz sand. An electrostatically unfavorable condition for deposition existed at pH 7, at which the greatest retention occurred in the column, likely due to aggregation (> 1000 nm) and straining effects. Under electrostatically favorable conditions (pH 5) significant elution from the column was observed and attributed to smaller aggregate size (similar to 300 nm) and blocking effects. Nanoparticle concentration was found to contribute to the increased breakthrough of nanoparticles at pH 5 due to blocking and subsequent particle-particle repulsion. Increased flowrate resulted in greater elution of nanoparticles due to hydrodynamic forces acting on aggregates and subsequently contributed to blocking. Overall, a combination of mechanisms including straining, blocking, and DLVO-type forces were involved over the range of solution chemistry and nanoparticle concentrations tested. Consideration of these mechanisms is necessary for improved removal of TiO2 nanoparticles via filtration and reliable prediction of transport of these potentially problematic nanoparticles through the subsurface. (C) 2011 Elsevier Inc. All rights reserved.
Metrics
Details
- Title
- Mechanisms of TiO2 nanoparticle transport in porous media: Role of solution chemistry, nanoparticle concentration, and flowrate
- Creators
- Indranil Chowdhury - University of California, RiversideYongsuk Hong - Korea Environment InstituteRyan J. Honda - University of California, RiversideSharon L. Walker - University of California, Riverside
- Publication Details
- Journal of colloid and interface science, v 360(2), pp 548-555
- Publisher
- Elsevier
- Number of pages
- 8
- Grant note
- DBI-0830117 / University of California Center for the Environmental Implications of Nanotechnology (National Science Foundation and Environmental Protection Agency)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- College of Engineering
- Web of Science ID
- WOS:000292066100029
- Scopus ID
- 2-s2.0-79958796125
- Other Identifier
- 991021229880604721
UN Sustainable Development Goals (SDGs)
This publication has contributed to the advancement of the following goals:
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical