Abstract
The migration of zinc oxide nanoparticles (nZnO) in geosynthetic clay liners (GCLs) under different osmotic pressures was conducted using a self-developed geosynthetic clay liner osmometer. The effects of the osmotic pressure on the migration behavior of nZnO in GCLs were analyzed. The results showed that, with an increase of osmotic pressure, the retention rate of nZnO increased greatly, the particle size increased, the stability of the soliquoid declined, GCLs pores were compressed, the infiltration coefficient of GCLs reduced, and the interception effect of GCLs on nZnO particles strengthened. The two-site model can simulate the migration behavior of nZnO in GCLs very well. The correlativity between the maximum migration distance (Lmax) of nZnO in GCLs and the osmotic pressure was negative.
Highlights
Zinc oxide nanopartilces are a high-performance inorganic product and are currently one of the most widely used engineered nanoparticles (ENPs) in the world [1, 2]
Erefore, it is an important issue that how osmotic pressure in landfill leachate impacts on migration behaviors of nZnO particles from geosynthetic clay liners (GCLs) to the groundwater
The interception ratio was 82.04% under an osmotic pressure of 0.5 MPa, meaning that a substantial quantity of nZnO particles deposited in GCLs, with only 17.96% of the particles migrating from GCLs and only 0.18% of the particles migrating out of the GCLs
Summary
Zinc oxide nanopartilces (nZnO) are a high-performance inorganic product and are currently one of the most widely used engineered nanoparticles (ENPs) in the world [1, 2]. E porous medium was typically composed of quartz sand, silica sand, and glass beads, which serve as a simplified replacement of natural soil. E interception ratio of nC60 in Advances in Civil Engineering clay-containing soil specimens was far higher than that in quartz sand and glass beads. Aforementioned research on the migration of nanoparticles in ideal porous media (e.g., glass beads and quartz sand) or sand obtained preliminary results [21, 22]. No published studies have considered the influence of osmotic pressure on the migration properties of nanoparticles in a porous medium. Erefore, it is an important issue that how osmotic pressure in landfill leachate impacts on migration behaviors of nZnO particles from GCLs to the groundwater
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