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Please use this identifier to cite or link to this item: http://hdl.handle.net/10373/1272

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Title: Deposition and transport of functionalized carbon nanotubes in water-saturated sand columns
Authors: Tian, Yuan
Gao, Bin
Wang, Yu
Morales, Verónica L.
Carpena, Rafael Munoz
Huang, Qingguo
Yang, Liuyan
Affiliation: University of Abertay Dundee. Scottish Informatics, Mathematics, Biology and Statistics Centre
Keywords: Transport
Surface charge heterogeneity
Issue Date: Apr-2012
Publisher: Elsevier
Type: Journal Article
Refereed: peer-reviewed
Rights: This is the author's final version of this article. Published version © Elsevier, available from www.elsevier.com
Citation: Tian, Y., et al. 2012. Deposition and transport of functionalized carbon nanotubes in water-saturated sand columns. Journal of Hazardous Materials. 213-214: pp.265-272. Available from http://dx.doi.org/10.1016/j.jhazmat.2012.01.088
Abstract: Knowledge of the fate and transport of functionalized carbon nanotubes (CNTs) in porous media is crucial to understand their environmental impacts. In this study, laboratory column and modeling experiments were conducted to mechanistically compare the retention and transport of two types of functionalized CNTs (i.e., single-walled nanotubes and multi-walled nanotubes) in acid-cleaned, baked, and natural sand under unfavorable conditions. The CNTs were highly mobile in the acid-cleaned sand columns but showed little transport in the both natural and baked sand columns. In addition, the retention of the CNTs in the both baked and natural sand was strong and almost irreversible even after reverse, high-velocity, or surfactant flow flushing. Both experimental and modeling results showed that pH is one of the factors dominating CNT retention and transport in natural and baked sand. Retention of the functionalized CNTs in the natural and baked sand columns reduced dramatically when the system pH increased. Our results suggest that the retention and transport of the functionalized CNTs in natural sand porous media were mainly controlled by strong surface deposition through the electrostatic and/or hydrogen-bonding attractions between surface function groups of the CNTs and metal oxyhydroxide impurities on the sand surfaces.
URI: http://hdl.handle.net/10373/1272
ISSN: 0304-3894
Appears in Collections:SIMBIOS Collection

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