Investigation of the transport and deposition of fullerene (C60) nanoparticles in quartz sands under varying flow conditions

Yusong Li, Yonggang Wang, Kurt D. Pennell, Linda M.A. Briola

Research output: Contribution to journalArticle

171 Citations (Scopus)

Abstract

A coupled experimental and mathematical modeling invest on was undertaken to explore nanoscale fullerene aggregate (nC60) transport and deposition in water-saturated porous media. Column experiments were conducted with four different size fractions of Ottawa sand at two pore-water velocities. A mathematical model that incorporates nonequilibrium attachment kinetics and a maximum retention capacity was used to simulate experimental nC60 effluent breakthrough curves and deposition profiles. Fitted maximum retention capacities (Smax), which ranged from 0.44 to 13.99 μg/g, are found to be correlated to normalized mass flux. The developed correlation provides a means to estimate Smax as a function of flow velocity, nanoparticle size, and mean grain size of the porous medium. Collision efficiency factors, estimated from fitted attachment rate coefficients, are relatively constant (∼0.14) over the range of conditions considered. These fitted values, however, are more than 1 order of magnitude larger than the theoretical collision efficiency factor computed from Derjaguin-Landau-Verwey-Overbeek (DLVO) theory (0.009). Data analyses suggest that neither physical straining nor attraction to the secondary minimum is responsible for this discrepancy. Patch-wise surface charge heterogeneity on the sand grains is shown to be the likely contributor to the observed deviations from classical DLVO theory. These findings indicate that modifications to clean-bed filtration theory and consideration of surface heterogeneity are necessary to accurately predict nC60 transport behavior in saturated porous media.

Original languageEnglish (US)
Pages (from-to)7174-7180
Number of pages7
JournalEnvironmental Science and Technology
Volume42
Issue number19
DOIs
StatePublished - Oct 1 2008

Fingerprint

fullerene
Quartz
Porous materials
porous medium
Sand
quartz
Nanoparticles
sand
collision
Fullerenes
Water
breakthrough curve
Surface charge
Flow velocity
flow velocity
Effluents
porewater
Mass transfer
grain size
Mathematical models

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Investigation of the transport and deposition of fullerene (C60) nanoparticles in quartz sands under varying flow conditions. / Li, Yusong; Wang, Yonggang; Pennell, Kurt D.; Briola, Linda M.A.

In: Environmental Science and Technology, Vol. 42, No. 19, 01.10.2008, p. 7174-7180.

Research output: Contribution to journalArticle

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