2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Adsorption/Desorption of Cd by Titanium Dioxide Nanoparticles and Sediment Particles as well as Their Facilitated Bioaccumulation of Cd into Carp

X. Zhang, Y. Chen, H. Sun and J. Crittenden
Arizona State University, Tempe, US

Keywords:
TiO2 nanoparticles, sediment particles, Cd, adsorption, bioaccumulation

Abstract:
There are increasing concerns nowadays about the health and environmental impact of nanomaterials. In this study, the adsorption/desorption abilities of Cd onto TiO2 nanoparticles and on natural sediment particles (SP) were examined and the difference in facilitated transport ability were assessed. The results showed that TiO2 nanoparticles had a significantly stronger adsorption capacity for Cd than SP. The isotherm data followed Freundlich isotherm and the constants KF and n were found to be 32.8 mg/g and 0.956 for P25 and 3.25 mg/g and 1.03 for SP. After 144 hour’s desorption, Cd desorption percentage from P25 was approximately 6% lower than that from SP. However, the desorbed amount of Cd from P25 was much higher than those from SP. Facilitated transport abilities of toxic pollutants by particles are related with the adsorption/desorption capability of the particles. The large adsorption and desorption amount of P25 indicates that the adsoprtin/desorption from nanoparticles has a significant influence on the mobility and bioavailability of Cd in aquatic environments. The results of bioaccumulation tests showed that the presence of SP did not have significant influence on the accumulation of Cd in carp during the 25 day’s of exposure. However, the presence of TiO2 nanoparticles greatly enhanced the accumulation of Cd in carp. After 25 day’s of exposure, Cd concentration in carp increased by 146%.

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