Abstract
To understand the effects of ionic strength and pH on the transport of natural soil nanoparticles (NS) in saturated porous media, aeolian sandy soil nanoparticles (AS), cultivated loessial soil nano particles (CS), manural loessial soil nanoparticles (MS) and red soil nanoparticles (RS) were leached with solutions of varying pH and ionic strength. The recovery rate of soil nanoparticles decreased in the order AS > RS > MS > CS. Transport of soil nanoparticles was enhanced with increasing pH and decreasing ionic strength and was attributable to changes in the Zeta potential of NS. Deposition of NS was also affected by the composition of soil nanoparticles and the surface charge. Column experiments showed that the interaction between soil nanoparticles and saturated quartz sand was mainly due to the physical and chemical properties of soil nanoparticles. The Derjaguin–Landau–Verwey–Overbeek interaction energies between NS and sand were affected by pHs and ionic strengths. Soil nanoparticles transport through saturated porous media could be accurately simulated by the one-dimensional advection-dispersion-reaction equation.
Highlights
Soil colloids generally have a diameter less than 10 μm and nanoparticles less than 100 nm [1]
aeolian sandy soil nanoparticles (AS) had a relatively larger particle diameter compared with the other soil nanoparticles because the composition of the aeolian sandy soil was mainly quartz, which did not favor the formation of smaller particles [44]
The behavior of NS transport in the saturated porous media was demonstrated by column experiments and was consistent with the predictions of the DLVO theory
Summary
Soil colloids generally have a diameter less than 10 μm and nanoparticles less than 100 nm [1]. The transport of soil colloids in saturated porous media is influenced by solution pH [15] and ionic strength [16]. In natural environments, both soil pH and ionic strength will change with variations in rainfall and irrigation [17]. A large number of studies the effects of pH and ionic strength on the transport of colloids in porous media are investigated [6,19] and used a single medium, quartz sand, to simulate soil medium [6,20]
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