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Desorption of polycyclic aromatic hydrocarbons from carbon nanomaterials in water

Yang, Kun and Xing, Baoshan (2007) Desorption of polycyclic aromatic hydrocarbons from carbon nanomaterials in water. ENVIRONMENTAL POLLUTION, 145 (2). pp. 529-537.

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Desorption behavior of pyrene, phenanthrene and naphthalene from fullerene, single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) was examined. Available adsorption space of carbon nanotubes (CNTs) was found to be the cylindrical external surface, neither the inner cavities nor inter-wall spaces due to impurities in the CNTs and restricted spaces (0.335 nm) of the MWCNTs, respectively. Desorption hysteresis was observed for fullerene but not for CNTs. Deformation-rearrangement was proposed to explain the hysteresis of polycyclic aromatic hydrocarbons (PAHs) for fullerene, due to the formation of closed interstitial spaces in spherical fullerene aggregates. However, long, cylindrical carbon nanotubes could not form such closed interstitial spaces in their aggregates due to their length, thus showing no significant hysteresis. High adsorption capacity and reversible adsorption of PAHs on CNTs imply the potential release of PAHs if PAH-adsorbed CNTs are inhaled by animals and humans, leading to a high environmental and public health risk. (c) 2006 Elsevier Ltd. All rights reserved.

Item Type:Article
Uncontrolled Keywords:desorption; polycyclic aromatic hydrocarbons; carbon nanotubes; fullerene; hysteresis; sorption
Subjects:Physical Science > Nano objects
NanoSafety > Environment, health and safety aspects of nanotechnology
ID Code:755
Deposited By:Farnush Anwar
Deposited On:12 Dec 2008 11:44
Last Modified:12 Dec 2008 11:44

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