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Preparation method of in-situ repair material for soil polluted by heavy metal chromium and application of material

An in-situ remediation and soil technology, applied in the restoration of contaminated soil, etc., can solve the problems of easy aggregation of nano-metal particles, low processing efficiency, and poor fluidity, and achieve good fluidity, low preparation cost, and difficult aggregation.

Active Publication Date: 2013-06-26
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing modified nano-metal particles to overcome the shortcomings of traditional nano-metal particles such as easy agglomeration, poor fluidity and high cost.
[0006] Another object of the present invention is to provide the application of the above-mentioned modified nano-metal particles in the in-situ remediation of chromium-contaminated soil, so as to solve the problems of low treatment efficiency, long period and complex engineering of traditional treatment methods

Method used

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  • Preparation method of in-situ repair material for soil polluted by heavy metal chromium and application of material
  • Preparation method of in-situ repair material for soil polluted by heavy metal chromium and application of material
  • Preparation method of in-situ repair material for soil polluted by heavy metal chromium and application of material

Examples

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Effect test

preparation example Construction

[0033] A method for preparing a modified nano metal particle suspension, comprising the steps of:

[0034] 1) Dissolve carboxymethyl cellulose in water and carry out oxygen removal treatment, then add steel pickling waste liquid and stir for 5-30 minutes to obtain solution A;

[0035] 2) Dissolve the reducing agent in 15-50% ethanol solution (mass ratio of ethanol to water) to obtain solution B;

[0036] 3) Add solution B dropwise to solution A while stirring, and continue to stir until the solution turns black. After ultrasonic treatment for 5-30 minutes, solution C is obtained, which is a modified nano-metal particle suspension containing zero-valent iron.

Embodiment 1

[0051] The preparation method of the CMC-nZVI of different stability comprises the steps:

[0052] 1) Dissolve 1.2g of carboxymethylcellulose (CMC) in 900mL of deionized water, stir until completely dissolved, blow with nitrogen for 15 minutes to remove dissolved oxygen in the solution, add 20mL of steel pickling waste, and stir at 30rpm 5min, obtain solution A;

[0053] 2) Dissolve 13g of sodium borohydride in 280mL of 30% (w / w) ethanol solution to obtain solution B;

[0054] 3) Slowly add solution B dropwise to solution A under stirring, continue to stir until the solution turns black, undergo ultrasonic treatment with a frequency of 30 Hz for 15 minutes, and let stand for 20 minutes to obtain solution C, which contains zero-valent iron (Fe 0 ) modified nano-metal particle suspension (suspension 1) modified with 0.1% CMC (w / w) at a concentration of 0.2 g / L, represented by CMC-nZVI.

[0055] 4) Prepare Fe separately 0 CMC-nZVI modified with 0.2 and 0.3% CMC at a concentrat...

Embodiment 2

[0058] Different Fe 0 The preparation method of the CMC-nZVI of concentration, comprises the steps:

[0059] 1) Dissolve 0.2g of carboxymethyl cellulose in 80ml of deionized water, stir until completely dissolved, blow with nitrogen for 10min, add 0.1mL of 10-fold diluted iron and steel pickling waste, and stir at 25rpm for 20min to obtain solution A;

[0060] 2) Dissolve 3mg of sodium borohydride in 39.9mL of 30% (w / w) ethanol solution to obtain solution B;

[0061] 3) Slowly add solution B dropwise to solution A under stirring, continue to stir until the solution turns black, undergo ultrasonic treatment with a frequency of 45Hz for 5min, and let it stand for 15min to obtain Fe 0 The appearance of CMC-nZVI modified by 0.17% CMC (suspension 4) with a concentration of 0.01 g / L is similar to that of the product obtained in Example 1.

[0062] According to the above method, Fe 0 For 0.17% CMC-modified CMC-nZVI (suspension 5-8) with a concentration of 0.01-0.21g / L, the amount ...

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Abstract

The invention discloses a preparation method of an in-situ repair material for soil polluted by heavy metal chromium and an application of the material. According to the invention, the in-situ repair material, which is modified nano metal particles, for the soil polluted by chromium is prepared by taking steel pickling waste liquor as a raw material and carboxymethylcellulose as a dispersing agent; the material has the advantages of good mobility, great specific surface area and strong stability and has good reaction activity in the in-situ repair of the soil polluted by the chromium and better repair effect than common nano zero-valent iron; as the preparation method is simple, the in-situ repair material can be prepared in the site and used for implementing the in-situ repair of the soil polluted by the chromium; and meanwhile, the steel pickling waste liquor is used for preparing the zero-valent iron, so that the treatment cost can be reduced and the purpose of treating waste by using waste is achieved.

Description

technical field [0001] The invention belongs to the technical field of nanometer material preparation and environmental pollution control and restoration, and in particular relates to a preparation method and application of modified nanometer metal particles, an in-situ restoration material for heavy metal chromium polluted soil. Background technique [0002] Chromium compound is one of the main series products of inorganic chemical industry, widely used in chemical industry, light industry, metallurgy, textile, machinery and other industries. According to statistics, about 15% of the products in my country's national economy are related to chromium compounds. Chromium pollution in soil may be caused by sedimentation of chromium-containing particles, industrial chromium-containing sludge and waste disposal during chromium production. At present, the deterioration of the regional agricultural environment in my country and the pollution of agricultural products by heavy metal...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 方战强王玉
Owner SOUTH CHINA NORMAL UNIVERSITY
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