Transport of Multi-Walled Carbon Nanotubes in Saturated Porous Media
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Carbon nanotubes (CNTs) have been one of the most studied nanoparticles and incorporated into various consumer products. It has been reported that CNTs can enter groundwater systems by accidental or intentional release into the subsurface. As transport mechanisms of CNTs are not well understood, investigation on mobility of CNTs in the subsurface will be helpful to define disposal regulations of CNTs. The objective in this study is to investigate the effect of solution chemistry (pH and ionic strength) and physical factors (collector grain size and flow rate) on the transport of multi-walled carbon nanotubes (MWCNTs). One-dimensional convection-dispersion model incorporated with collector efficiency for cylindrical nanoparticles was used to simulate the transport of MWCNTs in porous media. It was observed that higher pH led to increase in mobility of MWCNTs. The critical point of ionic strength for MWCNTs getting mobilized was narrowed down in the range of 2 to 5 mM. It was observed that the finer porous media could retain more nanoparticles. The decrease in pore water velocity resulted in a clear retardation, lowered the hydrodynamic force acting on the particles and led to more retention.
Place, publisher, year, edition, pages
2012. , 42 p.
Examensarbete vid Institutionen för geovetenskaper, ISSN 1650-6553 ; 236
MWCNTs, solution chemistry, DLVO, straining, saturated porous media
Oceanography, Hydrology, Water Resources
IdentifiersURN: urn:nbn:se:uu:diva-177092OAI: oai:DiVA.org:uu-177092DiVA: diva2:540701
Master Programme in Earth Science
2012-06-14, Norrland 1, Villavägen 16, Uppsala, 11:15 (English)
UppsokLife Earth Science
Sharma, Prabhakar, Assistant Professor
Halldin, Sven, Professor