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Organic pollutant-resistant polymer bentonite nanocomposite material and preparation method thereof

A technology of nano-composite materials and organic pollutants, which is applied in the fields of civil engineering and environmental geotechnical engineering, can solve the problems of reduced chemical compatibility, weakened chemical compatibility, anti-seepage characteristics, etc., and achieves simple and easy-to-operate preparation methods, Broad application prospects and environmental protection significance, the effect of low permeability coefficient

Active Publication Date: 2015-12-30
SOUTHEAST UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, when bentonite is in the environment of organic pollutant solution, the chemical compatibility decreases sharply, which greatly weakens the chemical compatibility of soil-bentonite separation walls, geosynthetic bentonite blankets, and bentonite-modified compacted clay liners. resistance, anti-seepage properties

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  • Organic pollutant-resistant polymer bentonite nanocomposite material and preparation method thereof

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preparation example Construction

[0024] The preparation method of the above-mentioned polymer bentonite nanocomposite material resistant to organic pollutants comprises the following steps:

[0025] Step 10) mix bentonite and water, and stir with a mixer to prepare bentonite slurry.

[0026] In step 10), preferably, bentonite and water are prepared at a mass ratio of 0.1-0.2:1. Before mixing bentonite with water, pass through a 200-mesh sieve to remove impurities. The bentonite is passed through a 200-mesh sieve to make the particle size not greater than 0.15mm. The rotating speed of the mixer is 500-3000r / min, and the stirring time of the mixer is 5-15min.

[0027] Step 20) Add cationic polyacrylamide solution to the bentonite slurry and stir to form a mixed slurry of cationic polyacrylamide and bentonite.

[0028] In step 20), preferably, the cationic polyacrylamide in the cationic polyacrylamide solution accounts for 0.1-10% of the bentonite mass in the bentonite slurry. The cationic polyacrylamide is ...

Embodiment 1

[0037] Step 10) Pass the calcium-based bentonite through a 200-mesh sieve, mix the bentonite and water, prepare the bentonite and water according to the mass ratio of 0.1:1, stir with a mixer, the speed of the mixer is 2000r / min, and the mixing time is 10min to obtain bentonite mud.

[0038] Step 20) Add cationic polyacrylamide solution to the bentonite slurry and stir, the mass of cationic polyacrylamide accounts for 0.1% of the mass of bentonite in the bentonite slurry to form a mixed slurry of cationic polyacrylamide and bentonite. Among them, the molecular weight of cationic polyacrylamide is 5×10 6 .

[0039] Step 30) Put the cationic polyacrylamide and bentonite mixed slurry in a constant temperature water bath, the water temperature in the constant temperature water bath is 55°C, and stir the cationic polyacrylamide and bentonite mixed slurry at a speed of 200r / min for 4 hours. The cationic polyacrylamide undergoes a nano-intercalation reaction between the bentonite l...

Embodiment 2

[0042] Step 10) Pass the calcium-based bentonite through a 200-mesh sieve, mix the bentonite and water, prepare the bentonite and water according to the mass ratio of 0.2:1, stir with a mixer, the speed of the mixer is 500r / min, and the mixing time is 15min to obtain bentonite mud.

[0043] Step 20) Add cationic polyacrylamide solution to the bentonite slurry and stir, the mass of cationic polyacrylamide accounts for 1% of the mass of bentonite in the bentonite slurry to form a mixed slurry of cationic polyacrylamide and bentonite. Among them, the molecular weight of cationic polyacrylamide is 8×10 6 .

[0044] Step 30) Put the cationic polyacrylamide and bentonite mixed slurry in a constant temperature water bath, the water temperature in the constant temperature water bath is 60°C, stir the cationic polyacrylamide and bentonite mixed slurry at a speed of 1200r / min for 3 hours, The cationic polyacrylamide undergoes a nano-intercalation reaction between the bentonite layers ...

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Abstract

The invention discloses an organic pollutant-resistant polymer bentonite nanocomposite material which comprises bentonite and cationic polyacrylamide, wherein the mass of the cationic polyacrylamide is 0.1 to 10 percent of that of the bentonite. The material can effectively improve the chemical compatibility of the bentonite, improve the capability of resisting organic pollutants, and can still maintain a very low permeability coefficient under the effect of contaminating fluid, so the impermeable property of bentonite type separation facilities is greatly improved, the effective service life of the separation facilities is prolonged, and the engineering cost is reduced. Meanwhile, a preparation method of the organic pollutant-resistant polymer bentonite nanocomposite material is provided, and the method is simple and easy.

Description

technical field [0001] The invention belongs to the technical fields of civil engineering and environmental geotechnical engineering, and specifically relates to a polymer bentonite nanocomposite material resistant to organic pollutants and a preparation method thereof. Background technique [0002] With the continuous acceleration of my country's urbanization process, the industrial structure of large and medium-sized cities has also been adjusted and upgraded. The original large-scale heavy industrial enterprises have gradually migrated to small cities and western regions. The organic pollution problems in the original industrial sites have seriously restricted the development of cities. The large amount of organic pollutants in the landfill leachate reduces the performance of the anti-seepage facilities of the landfill, and easily causes the pollutants to seep into the groundwater, threatening human health. Therefore, the problem of organic pollution has become an urgent pr...

Claims

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Application Information

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IPC IPC(8): C08L33/26C08K3/34
Inventor 杜延军沈胜强范日东任伟伟梅丹兵
Owner SOUTHEAST UNIV
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