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Deposition and mobilization of functionalized multiwall carbon nanotubes in saturated porous media: effect of grain size, flow velocity and solution chemistry
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. (Geohydrology)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. Uppsala University.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. (Geohydrology)
2014 (English)In: Environmental Earth Sciences, ISSN 1866-6280, E-ISSN 1866-6299, Vol. 72, no 8, 3025-3035 p.Article in journal (Refereed) Published
Abstract [en]

Carbon nanotubes (CNTs) are widely manufactured nanoparticles which are utilized in a number of consumer products, such as sporting goods, electronics and biomedical applications. Due to their accelerating production and use, CNTs constitute a potential environmental risk if they are released to soil and groundwater systems. It is therefore essential to improve the current understanding of environmental fate and transport of CNTs. The current study systematically investigated the effect of solution chemistry (pH and ionic strength) and physical conditions (collector grain size and flow rate) on the deposition and mobilization of functionalized multiwall carbon nanotubes (MWCNTs) using a series of column experiments under fully saturated conditions. A 1-dimensional convection-dispersion model including collector efficiency for cylindrical nanoparticles was used to simulate the transport of MWCNTs in porous media. It was observed that an increase in pH resulted in increased mobility of MWCNTs. However, the transport of MWCNTs was strongly dependent on ionic strength of the background solution and a critical deposition concentration (CDC) was observed between 3 and 4 mM NaCl concentration, with more than 99% filtration of MWCNTs at 4 mM. The finer sand grains were able to filter a significant amount of MWCNTs (15% more than coarse sand) from the inflow solution; this was likely caused by grain-to-grain straining mechanisms in the finer sand. A decrease in pore-water velocity also led to more deposition of MWCNTs due to lowering of the kinetic energy of the particles. The results from this study indicated that a weak secondary minimum existed under unfavorable conditions for deposition, but the particles were trapped at both primary and secondary minimum.

Place, publisher, year, edition, pages
2014. Vol. 72, no 8, 3025-3035 p.
Keyword [en]
MWCNT; transport; retention, porous media
National Category
Nano Technology Geosciences, Multidisciplinary
Research subject
Hydrology
Identifiers
URN: urn:nbn:se:uu:diva-218031DOI: 10.1007/s12665-014-3208-7ISI: 000342494100023OAI: oai:DiVA.org:uu-218031DiVA: diva2:694583
Available from: 2014-02-06 Created: 2014-02-06 Last updated: 2017-12-06Bibliographically approved

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Sharma, PrabhakarFagerlund, Fritjof

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