Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8893802 | Geoderma | 2019 | 12 Pages |
Abstract
Nanoparticle effects on mechanical and physical properties of soil have rarely been investigated, particularly those of iron and magnesium nano-oxides. This study investigated the effects of the application of nano-oxides on total porosity, mean weight diameter (MWD) of aggregates, volumetric water content at a matric potential of â100â¯kPa, penetration resistance, and saturated hydraulic conductivity. Nanoparticle type (two types comprising iron and magnesium nano-oxides), application dosage (four dosages of 0, 1, 3, and 5% by weight), and incubation period (40 and 100â¯days) comprised the factors considered. The magnesium nano-oxide treatments increased (Pâ¯<â¯0.05) total porosity by reducing soil bulk density due to the smaller size of magnesium compared with iron by 0.04â¯cm3â¯cmâ3. After both incubation periods, each application dosage of magnesium nano-oxide increased (Pâ¯<â¯0.05) the MWD of the aggregates, ranging from 0.47 to 2.91, compared with the control and all of the iron nano-oxide dosages because of the large flocculation capacity of magnesium nano-oxide. The 1 and 3% applications of magnesium nano-oxide increased (Pâ¯<â¯0.05) the water content, ranging from 0.01 to 0.02â¯cm3â¯cmâ3 compared with the control and 1 and 3% of the iron nano-oxide dosages, possibly by increasing the specific surface, stabilizing the soil structure, and increasing the microporosity. Penetration resistance increased (Pâ¯<â¯0.05) about 0.14-0.28â¯MPa under the iron nano-oxide treatments whereas penetration resistance decreased (Pâ¯<â¯0.05) about 0.21-0.33â¯MPa under the magnesium nano-oxide treatments. The saturated hydraulic conductivity decreased (Pâ¯<â¯0.05) after both incubation periods with iron (24-61%), and after incubation for 40â¯days with magnesium (38-56%). However, the saturated hydraulic conductivity increased (Pâ¯<â¯0.05) from 46 to 61% after incubation for 100â¯days with magnesium. It was concluded that magnesium nano-oxides can improve selected soil physical and mechanical properties due to their large adhesivity, specific surface, activity, and reaction ability.
Keywords
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Earth-Surface Processes
Authors
Hossein Bayat, Zahra Kolahchi, Saeed Valaey, Mostafa Rastgou, Shahriar Mahdavi,