Effect of seepage velocity on the attachment efficiency of TiO2 nanoparticles in porous media
- Effect of seepage velocity on the attachment efficiency of TiO2 nanoparticles in porous media
- 김창우; 이승학
- attachment efficiency; seepage velocity; titanium dioxide nanoparticle; nanoparticle transport
- Issue Date
- Journal of hazardous materials
- VOL 279, 163-168
- tPreviously identified relationships between the attachment efficiency (˛) and seepage velocity (US) ofnanoparticles (NPs) were tested under simulated subsurface transport conditions, where the value of USis typically much less than the USon which they are based. This found an increase in the ˛ value of TiO2 NPs with respect to US, which contradicts previous reports suggesting a constant value or decrease. Bycomparing the adhesion energy of the TiO2 NPs to sand and the hydrodynamic energy required to detachthem, the increase of α with respect to USis found to be due to the difference in the magnitude of USconsidered; with 6.1E−05 to 1.3E−03 m s−1used in previous studies, whereas the current study uses avalue in the range from 2.4E−06 to 4.9E−04 m s−1. Only one of the previous models predicting ˛ showed asimilar increase of α with US, which was the result of it employing low velocities to examine the effects oforganic matter. The current findings therefore suggest that previously determined relationships between˛ and USneed to be further developed to incorporate more variables before they can be effectively usedto describe or predict the subsurface transport of TiO2 NPs.
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