Hydrophilic polymer modified bentonite composite material and preparation method and application thereof

A hydrophilic polymer and composite material technology, applied in water pollutants, alkali metal compounds, chemical instruments and methods, etc., can solve the problems of poor barrier effect, poor anti-seepage barrier performance, etc. High dispersion and low cost effect

Pending Publication Date: 2021-01-12
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problem of poor anti-seepage and barrier performance of the existing vertical separation wall with bentonite as the main raw material under the action of high-concentration heavy metal / organic matter polluted groundwater, and solve the problem of poor barrier effect of compacted clay liner on pollutants in the horizontal barrier system It can also be used as a raw material for geosynthetic clay liners to improve its anti-seepage performance and adsorption performance, and can be widely used in the treatment and restoration of high-concentration heavy metal / organic pollution sites

Method used

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  • Hydrophilic polymer modified bentonite composite material and preparation method and application thereof
  • Hydrophilic polymer modified bentonite composite material and preparation method and application thereof
  • Hydrophilic polymer modified bentonite composite material and preparation method and application thereof

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Effect test

Embodiment 1

[0049] A hydrophilic polymer modified bentonite composite material, including a hydrophilic polymer and a sodium modified bentonite; wherein the hydrophilic polymer is selected from polyanionic cellulose, and the quality is 0.5% of the mass of the bentonite parent soil, and the preparation method is as follows: Dry mixing method, including the following steps:

[0050] 1) Put the bentonite parent soil and polyanionic cellulose into an oven at 60°C for drying, and pass through a 100-mesh standard sieve for later use;

[0051] 2) Mix the polyanionic cellulose and the bentonite mother soil according to the above-mentioned mass ratio, put the mixture into a PE bottle, and tighten the bottle cap;

[0052] 3) Put the PE bottle on the inversion oscillator, set the rotation speed at 30r / min, and invert and shake at room temperature (22±1°C) for 24 hours to make it evenly stirred, and obtain the hydrophilic polymer modified bentonite composite material.

[0053] The hydrophilic polyme...

Embodiment 2

[0056] Hydrophilic polymer modified bentonite composite material, including hydrophilic polymer and sodium modified bentonite; wherein the hydrophilic polymer is selected from xanthan gum, and the quality is 0.5% of the mass of sodium modified bentonite, modified The method is a wet mixing method, comprising the following steps:

[0057] 1) Dissolving xanthan gum in deionized water, stirring with a glass rod, and configuring a polymer solution;

[0058] 2) According to the above-mentioned mass ratio, add bentonite to the polymer solution to obtain a suspension;

[0059] 3) Place the suspension at a constant temperature of 30-60°C, and set the hand-held high-speed agitator at a speed of 1500r / min, and stir for 12-24 hours to make it fully mixed to obtain a modified slurry;

[0060] 4) Put the modified mud at 20-40°C for 12-24 hours to hydrate;

[0061] 5) Put it in an oven after standing still, and dry it at 60°C without burning;

[0062] 6) Grinding it after drying, and pas...

Embodiment 3

[0069] Hydrophilic polymer modified bentonite composite material, including hydrophilic polymer and sodium modified bentonite; when the hydrophilic polymer is polyanionic cellulose, the quality is 1% of the quality of sodium modified bentonite, and the modified The permanent method is a dry mixing method, which includes the following steps:

[0070] 1) Sodiumized modified bentonite and polyanionic cellulose were respectively put into an oven at 60°C for drying, and passed through a 100-mesh standard sieve for later use;

[0071] 2) Mix polyanionic cellulose and bentonite according to the above-mentioned mass ratio, put the mixture into a PE bottle, and tighten the bottle cap;

[0072] 3) Put the PE bottle on the inversion oscillator, set the rotation speed at 30r / min, and invert and shake at room temperature (22±1°C) for 24 hours to make it evenly stirred, and obtain the hydrophilic polymer modified bentonite composite material.

[0073] Hydrophilic polymer modified bentonite...

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Abstract

The invention discloses a hydrophilic polymer modified bentonite composite material and a preparation method and application thereof. The polymer modified bentonite composite material comprises a hydrophilic polymer and sodium modified bentonite, wherein the hydrophilic polymer is one or two of polyanionic cellulose or xanthan gum, and the mass of the hydrophilic polymer is 0.5-10% of the mass ofthe sodium modified bentonite. The preparation method is a dry mixing method or a wet mixing method. The vertical barrier can be used as a vertical barrier of an industrial pollution site, and the seepage prevention performance, the adsorption performance and the migration blocking performance of the vertical barrier under the action of heavy metal/organic pollutant polluted underground water aregreatly improved, the device can also be used for compacting a clay layer in a horizontal blocking system so as to prevent pollutants in a polluted site from infiltrating, and the geosynthetic clay liner can also be used as a raw material of the geosynthetic clay liner to improve the impermeability, adsorption performance and migration resistance of the geosynthetic clay liner. The method has great engineering application potential, can be applied to blocking engineering construction of industrial contaminated sites, and improves the blocking effect.

Description

technical field [0001] The invention relates to the field of treatment and restoration of polluted sites, in particular to a hydrophilic polymer modified bentonite composite material and a preparation method and application thereof. Background technique [0002] At present, due to policy requirements, industrial enterprises have moved away from the city, leaving behind a large area of ​​industrial pollution sites, resulting in serious soil pollution problems. Investigations have shown that there are a large amount of heavy metals (including cadmium, chromium, lead, mercury, etc.) and organic pollutants in the soil (including HCH, DDT, polycyclic aromatic hydrocarbons, etc.), seriously threatening the safety of the surrounding ecological environment and the safety of human life and health. For sites where the pollutant risk assessment exceeds the standard and cannot be treated temporarily, a risk control plan should be formulated to remove or clean up pollution sources, and m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/28B01J20/30B01J20/22B09C1/08C02F1/28C02F101/20
CPCB01J20/28011B01J20/12B01J20/22B01J20/28035B09C1/08C02F1/281C02F1/285C02F2101/20
Inventor 温嘉明杜延军傅贤雷姜哲元
Owner SOUTHEAST UNIV
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