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Method for extracting soil nanoscale particles

An extraction method and nanoparticle technology, applied in the field of soil chemistry, can solve the problems of pollution, time extension, unfavorable natural nanoparticle research, etc., and achieve the effects of strong operability, reliable results, convenient preservation and subsequent research.

Inactive Publication Date: 2012-01-18
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] According to the existing vibration-sedimentation method, the chemical dispersion-sedimentation method to process the above-mentioned black soil, brown soil and brick red soil will lead to the following unfavorable factors: first, the time required is greatly extended; second, the nanoparticles obtained after chemical treatment It is mainly inorganic nanoparticles, which will remove the organic components in the soil during the treatment process, and organic nanoparticles are of great significance in natural nanoparticles, which is not conducive to the further research on natural nanoparticles; the third is shock-sedimentation method, chemical dispersion-sedimentation method will introduce new pollution, because chemical reagents are used in these methods

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  • Method for extracting soil nanoscale particles
  • Method for extracting soil nanoscale particles
  • Method for extracting soil nanoscale particles

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1, a kind of extraction method of soil nano-scale particle, carries out following steps successively:

[0044] 1), choose suitable soil:

[0045] Choose black soil as suitable soil;

[0046] 2), pre-processing:

[0047] Air-dry the above-mentioned suitable soil to constant weight, remove gravel, cuttings and plant roots and other debris in the soil, and then crush and grind until it can pass through a 2mm sieve. Weigh 3 g of the sieved soil and place it in a 100 ml casing cooling cup, add 80 ml of distilled water to obtain a soil-water suspension.

[0048] Use a probe-type ultrasonic disperser to disperse the above-mentioned soil-water suspension. The ultrasonic probe is fixed at a place 2cm deep from the surface of the suspension. Ultrasonic dispersion, because a large amount of heat will be generated during the ultrasonic process, and the rapidly rising temperature will destroy the natural structure and components of the soil. Therefore, a casing cooling...

Embodiment 2

[0058] Select brown soil (replacing black soil) as suitable soil; All the other are exactly the same as embodiment 1.

[0059] Step 3) the soil nanoparticle solution of gained, after measuring: particle size distribution sees figure 2 -B, while observing the morphology of nanoparticles by transmission electron microscope, see image 3 -B.

[0060] From figure 2 -B and image 3 -B We can know that the particle size of the nanoparticles extracted from the brown soil is about 40nm.

[0061] Step 4) the agglomeration of the powdery soil nanoparticles obtained after freeze-drying, the morphology of the agglomerates observed in a scanning electron microscope is shown in Figure 4 -B, i.e., when freeze-dried, the nanoparticles aggregate into aggregates of about 5 μm. Therefore, it is judged that the form of its aggregation has exceeded the nanometer scale, and may not be able to show the proper size and surface properties of the nanoparticles. Therefore, it is recommended to s...

Embodiment 3

[0064] Select brick red soil (replacing black soil) as suitable soil; All the other are exactly the same as embodiment 1.

[0065] Step 3) the soil nanoparticle solution of gained, after measuring: particle size distribution sees figure 2 -C, while observing the morphology of nanoparticles by transmission electron microscopy, see image 3 -C.

[0066] From figure 2 -C and image 3 -C We can know that the particle size of the nanoparticles extracted from the brick red soil is about 45nm.

[0067] Step 4) the agglomeration of the powdery soil nanoparticles obtained after freeze-drying, the morphology of the agglomerates observed in a scanning electron microscope is shown in Figure 4 -C, that is, after freeze-drying, the nanoparticles will aggregate into flocculent aggregates of about 5 μm; therefore, it is judged that the aggregated form has exceeded the nanometer scale, and may not be able to show the proper size and surface properties of the nanoparticles, Therefore, i...

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Abstract

The invention discloses a method for extracting soil nanoscale particles. The method comprises the steps of: (1) selecting black soil, brown soil or latosol as suitable soil; (2) crushing and sieving the naturally aired suitable soil, adding distilled water in the sieved soil and performing uniform ultrasonic dispersion for the obtained soil turbid liquid; and (3) sieving the ultrasonically dispersed soil turbid liquid, placing the sieved soil turbid liquid in a centrifuge tube to be centrifuged under the condition with the centrifugal force of 900-1100 g for 22-25 min so as to obtain an upper suspension as a soil nanoscale particle solution. According to the invention, the method for extracting the soil nanoscale particles from the soil is clean, rapid and free from use of chemical dispersants.

Description

technical field [0001] The invention belongs to the field of soil chemistry, and in particular relates to an optimized extraction method of soil nano-scale particles. Background technique [0002] Nanomaterials are emerging materials with good development prospects at present. Their size is between 1-100nm. Because of their extremely small size, they have special properties such as quantum size effect, surface effect and macroscopic quantum tunneling effect. They are used in scientific research, It has great application prospects in the fields of technology and engineering. At present, the prevention and restoration of soil pollution, the protection of soil environmental safety and the sustainable use of soil resources have become the focus of global attention. Nanomaterials also show a very broad development space in the field of soil pollution prevention and control. A large number of studies have shown that nanoparticles have good remediation capabilities for various env...

Claims

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Application Information

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IPC IPC(8): B01F11/02B01F15/06B01D21/26F26B5/00B09C1/00G01N1/28B82Y40/00
Inventor 徐建明李文彦何艳吴建军汪海珍
Owner ZHEJIANG UNIV
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