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Separation and extraction of soil iron oxide nanoparticles

wallpapers News 2021-11-03
Soil contains a variety of organic and inorganic particles, which are a mixture of organic, inorganic, and biological particles of different sizes. Clay minerals, metal oxides, and humus are widely present in the soil, and these are abundant in hydroquartzite and montmorillonite in volcanic ash. Only a small fraction of the nanoparticles in soil exist in discrete form. Organic colloids in soils are largely paired with their inorganic substances or coated on mineral surfaces.
At present, the sedimentation method is widely used to extract nanoparticles such as iron oxide from soil. In other words, the soil is dispersed by chemical and ultrasonic to make soil suspension. Particles of all levels larger than 0.25mm are screened by a sieve with a fixed aperture, and those smaller than 0.25mm are placed in a settlement container with a fixed volume.
The settlement time of soil particles smaller than 100nm was calculated according to Stokes' law, and a special pipetting tube was driven by a peristaltic pump to absorb the soil suspension with the required size range, thus obtaining the required soil solution in line with the nanometer size range. Soil is a mixture of many substances, and the resulting nanoparticle solution is also a mixture of many substances. At present, it is not possible to separate a single substance, such as iron oxide, from the nanoparticle solution.
Moreover, the particle size of the extracted nano-soil solution is not uniform. If the soil rich in iron oxide is studied, representative nano iron oxide particles can be obtained. Currently we red soil was studied, using the above method in red soil nanoparticle suspension, with laser granularity instrument of suspension particle size distribution were analyzed, by scanning electron microscopy (sem) and transmission electron microscopy to the characterization of the surface features and morphology, and coupled with X-ray diffraction (XRD) is studied on its composition, experiments show that red soil is the repository of nanometer iron oxide. Extracted from red soil particle distribution of nanometer iron oxide as you can see, the extraction of nanoparticles is basic in the range of 100 nm, a bimodal distribution, this is because the laser particle size in the process of determination, is according to the size of light scattering Angle to decide the size of the particle size, in the determination of the filamentous or laser granulometery banded particulate matter, There are two normal distribution peaks in the length direction and the width direction, which makes the volume distribution of the laser particle size measurement results show a typical peak distribution.

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