Nano Archive

Desorption of polycyclic aromatic hydrocarbons from carbon nanomaterials in water

Yang, Kun and Xing, Baoshan (2006) 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. Fullerene has PAH desorption hysteresis but not carbon nanotubes because of their distinct geometry.

Item Type:Article
Uncontrolled Keywords:desorption; polycyclic aromatic hydrocarbons; carbon nanotubes; fullerene; hysteresis; sorption
Subjects:Technology > Nanotechnology and environmental applications
Physical Science > Nano objects
Material Science > Nanochemistry
ID Code:3152
Deposited By:Anuj Seth
Deposited On:26 May 2009 11:26
Last Modified:26 May 2009 11:26

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