Hangjin 2# soil loaded nano-zero valent iron adsorption material, preparation method and application

Abstract

The invention relates to a Hangjin 2# soil loaded nano-zero valent iron adsorption material, wherein the mass ratio of nano-zero valent iron to Hangjin 2# soil is 1:4-5. The preparation method employs Hangjin 2# soil as the carrier to load nano-zero valent iron, and the steps include: 1) dissolving an iron-containing oxide in an ethanol solution to obtain a mixed solution; 2) adding Hangjin 2# soil into the mixed solution of step 1, and controlling the mass ratio of nano-zero valent iron to Hangjin 2# soil at 1:4-5; 3) introducing nitrogen into the product of step 2, conducting stirring to remove oxygen; 4) adding a reducing agent into the product of step 3 to reduce the iron-containing oxide into nano-zero valent iron, and uniformly dispersing the nano-zero valent iron on the surface of the carrier material Hangjin 2# soil; and 5) subjecting the product obtained in step 4 to solid-liquid separation, and performing vacuum drying on the solid, thus obtaining the Hangjin 2# soil loaded nano-zero valent iron adsorption material. The adsorption material provided by the invention has higher reaction activity and reduction effectiveness, and has good application value in actual water pollution control and restoration projects.

Description

technical field [0001] The invention belongs to the field of nanometer adsorption materials, and in particular relates to an adsorption material loaded with nanometer zero-valent iron by Hangjin 2# soil. [0002] The present invention also relates to a method for preparing the above-mentioned adsorption material. [0003] The invention also relates to the use of the above-mentioned adsorption materials. Background technique [0004] Since nano-zero-valent iron has the advantages of small particle size, large surface effect, and high reactivity, it is an excellent environmental functional material that can efficiently remove various pollutants in water, such as heavy metal ions, organic pollutants, etc. Therefore, nano The removal of water pollutants by zero-valent iron is a new pollution control technology developed in recent years. It is considered to be a major innovation in water and soil in-situ remediation technology, and has great application prospects. However, nano...

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Problems solved by technology

[0005] (1) The large specific surface area and strong magnetism of nano-zero-valent iron make it easy to agglomerate and form large particles in the process of preparation and application, resulting in a decrease in specific surface area and activity, which greatly affects its Value;

[0006] (2) The agglomeration of nano-zero-valent iron particles can also reduce its fluidity in water, making the detergent diffuse unevenly, making it difficult to completely contact with pollutants, reducing the possibility of its practical engineering application;

[0007] (3) The high activity of nano-zero-valent iron also makes it easy to be oxidized by non-target pollutants in the environment (such as water and oxygen), that is, the "spontaneous combustion" of nano-zero-valent iron. Reduced resistance, unable to degrade pollutants in the environment for a long time

[0010] (2) The source of raw materials for partial load is limited and the cost of raw materials is high;

[0012] (4) The adsorption / flocculation performance of the loading material itself is limited, and most of them have no catalytic performance. How to better exert the reduction / adsorption / catalysis synergistic effect of the material and improve its removal rate of pollutants requires further research and development.

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