Application of Na-type nano-montmorillonite in removing copper in pollutant

A nano-montmorillonite and pollutant technology, which is applied in the restoration of polluted soil and other directions, can solve the problems of heavy metal-contaminated soil that have not been reported, and achieve the effect of strong adsorption capacity and high treatment efficiency.

Inactive Publication Date: 2010-06-23
INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, my country's nano-type montmorillonite is mainly used in casting, drilling, light industrial building materials, petrochemicals, pesticides, printing and dyeing, etc., but it has not been reported on the passivation treatment of heavy metal contaminated soil and sewage purification.

Method used

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  • Application of Na-type nano-montmorillonite in removing copper in pollutant
  • Application of Na-type nano-montmorillonite in removing copper in pollutant
  • Application of Na-type nano-montmorillonite in removing copper in pollutant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The preparation of embodiment 1 sodium type nanometer montmorillonite

[0021] The commercially available montmorillonite (BT) was prepared according to the following method to prepare sodium-type nano-montmorillonite.

[0022] First prepare the montmorillonite suspension with water, add 5% sodium carbonate modification agent under the condition of constant stirring, wherein, the mass ratio of sodium carbonate to montmorillonite is 1:50, after stirring for 2 hours, use physical sedimentation method to remove The coarse particles in the lower layer are dried, and then the nano-montmorillonite is obtained by ball milling (ball mill model: QM-3SP7). The physical and chemical properties of the above-mentioned nano-montmorillonite were determined by methods such as X-ray diffraction (XRD), and the results are as follows (see Table 1). After determination, the main compound components of the above-mentioned nano-montmorillonite include: SiO 2 、Al 2 o 3 , Fe 2 o 3 , CaO ...

Embodiment 2

[0025] Example 2 Na-type nano-montmorillonite adsorption and removal experiment of copper in water

[0026] Take by weighing the sodium type nanometer montmorillonite prepared by embodiment 1 in the plastic centrifuge tube, then with 0.05mol / LKNO 3 As a supporting electrolyte, add 0, 5, 10, 30, 60, 120, 150, 180, 240 mg·kg into each centrifuge tube -1 CuSO 4 ·5H 2 O aqueous solution 30ml, and with 0.05M HNO 3 / KOH to adjust the pH of the solution. According to the amount of sodium-type nano-montmorillonite and the pH of the solution, 6 groups of experiments were designed. The specific amount of sodium-type nano-montmorillonite and the pH of the solution in each group are shown in Table 2, and each group of experimental treatments was repeated 3 times. Cover and seal the centrifuge tube with the sample added, shake at a constant temperature at 25°C for 24 hours, then stand still and centrifuge (4000r·min -1 ) for 20 minutes, filtered, and measured the concentration of Cu i...

Embodiment 3

[0035] The passivation effect of embodiment 3 sodium type nano-montmorillonite to copper in polluted soil

[0036]The contaminated soil used in this example is taken from the actual copper-contaminated soil in the field (the soil of the vegetable garden in the mining area), and the copper content in the soil reaches 161.2mk.kg -1 , the pH of the soil is 6.5. The recovered soil was air-dried and passed through a 2-mm sieve, and a pot experiment was carried out to determine the effect of adding the sodium-type nano-montmorillonite prepared in Example 1 on copper absorption by plants.

[0037] In this example, the test plant is Chinese cabbage.

[0038] According to the different dosage of nano-montmorillonite, three treatments were set up in the experiment: 0 (blank, CK); The pots used in the experiment are small plastic pots, and each pot is filled with 500 grams of soil. The pakchoi seeds are planted in the pots after being germinated, and 0.2 g of N fertilizer is added to e...

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Abstract

The invention discloses an application of Na-type nano-montmorillonite in removing copper in pollutant, belonging to the technical field of heavy metal contaminated soil repair. The method is characterized in adding Na-type nano-montmorillonite into substance polluted by copper. When water is polluted by copper, the Na-type nano-montmorillonite is added into sewage, the dosage of the Na-type nano-montmorillonite is 3.34-6.67g.L-1, the Na-type nano-montmorillonite is balanced at the temperature of 23-27 DEG C for at least 24 hours, and copper ions in waste water can be removed by filtering after standing. When soil is polluted by copper, the Na-type nano-montmorillonite is added into polluted soil, wherein the mass percentage of the Na-type nano-montmorillonite to soil is 1.0-2.0%. Experiments prove that the Na-type nano-montmorillonite used by the invention has strong adsorbability on copper ions in aqueous solution, and the maximum adsorbance can reach 208.7mg.g-1; the addition of Na-type nano-montmorillonite can lower copper content in pakchoi stem leaves in polluted soil by 52.4-59.8% and lower copper content in pakchoi roots by 59.5-62.3%.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal polluted soil, and in particular relates to the application of sodium-type nano-montmorillonite in removing copper in pollutants. Background technique [0002] Soil and water heavy metal pollution and its prevention and control are one of the most important environmental problems faced by countries all over the world today. According to data reports, among the 1.4 million hectares of arable land irrigated with sewage in my country, 64.8% of the arable land is polluted by heavy metals to varying degrees. With the rapid development of my country's mining, metallurgy and other industries, a large amount of heavy metal sewage is produced every year, and some of the waste water is discharged into the water body without treatment or the treatment is not up to standard, causing the accumulation of heavy metals in the soil and water sources to intensify, resulting in serious pollution o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 陈世宝马义兵王萌李娜
Owner INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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