Abstract
Transport study of nanoparticle (NP) through matrix flow dominated aquifer sand and soils have significant influence in natural systems. To quantify the transport behaviour, magnetic resonance imaging (MRI) was used to image the iron oxide based nanoparticle, Molday ION (carboxyl terminated) through saturated sandstone rock core. T2-weighted images were acquired and the changes in image intensity were calibrated to get a quantitative concentration profiles at various time intervals. These profiles were evaluated through CXTFIT transport model to estimate the transport parameters. These parameters are estimated at various points along the length of the column while classical breakthrough curve analysis cannot provide these details. NP–surface interactions were investigated using DLVO (Derjaguin–Landau–Verwey–Overbeek) theory. The dispersion coefficients (2.55–1.21×10−7m2/s) were found to be decrease with distance, deposition rate constant k (6.70–9.13×10−4(1/s)) and fast deposition rate constant kfast (4.32–8.79×10−2(1/s)) were found to be increase with distance. These parameter variations over length will have a scaling up impact in developing transport models for environmental remediation and risk assessment schemes.
Highlights
Nanotechnology and nanoparticles (NPs) which are defined as less than 100 nm in length in at least one dimension, is a relatively recent research field that is expanding and diversifying rapidly.NPs have already been utilized in a in a diverse range of applications including textiles, agro-chemicals, electronics, cosmetics, new materials and environmental remediation [1] and the list is expanding
NPs released into environment that moves to ground water and surface water through soil layers can be hazardous to humans and the environment [2]
We aimed to study the transport of commercially available iron oxide based magnetic resonance imaging (MRI) compatible NP, negatively charged Molday ION was used
Summary
Nanotechnology and nanoparticles (NPs) which are defined as less than 100 nm in length in at least one dimension, is a relatively recent research field that is expanding and diversifying rapidly. NPs have already been utilized in a in a diverse range of applications including textiles, agro-chemicals, electronics, cosmetics, new materials and environmental remediation [1] and the list is expanding. NPs released into environment that moves to ground water and surface water through soil layers can be hazardous to humans and the environment [2]. There is very limited knowledge about the movement and fate of the fast growing engineered nanoparticles, especially when they are released into the ecosystems of environment.
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