Modified iron-copper bimetallic nanoparticles and preparation method thereof

Abstract

The invention discloses a modified iron-copper bimetallic nanoparticle and a preparation method thereof. The modified iron-copper bimetallic nanoparticle includes chitosan and iron-copper bimetallic nanoparticles, wherein chitosan is coated on the surfaces of the iron-copper bimetallic nanoparticles. The preparation method includes: mixing a chitosan solution with a ferrous sulfate solution, adding an NaHB4 solution dropwise for liquid phase reduction reaction, and adding a copper sulfate solution dropwise for in-situ displacement reaction to obtain the modified iron-copper bimetallic nanoparticle. The modified iron-copper bimetallic nanoparticle provided by the invention have the advantages of good dispersibility, strong reducibility, long service life and the like, and is an environment-friendly material that has good application prospects and can be applied to in-situ restoration of heavy metal polluted underground water. The preparation method of the modified iron-copper bimetallicnanoparticle provided by the invention has the advantages of simple operation, low cost, cleanness, no pollution, etc.

Description

technical field [0001] The invention belongs to the field of preparation of nanomaterials, and relates to a modified iron-copper bimetallic nanoparticle and a preparation method thereof, in particular to a chitosan-modified iron-copper bimetallic nanoparticle and a preparation method thereof. Background technique [0002] With the rapid development of the economy and the acceleration of urbanization, a large amount of untreated industrial wastewater, the random stacking of solid waste, and the use of a large number of pesticides and fertilizers have caused a variety of heavy metals to continuously enter the environment and seep into groundwater. Heavy metals have received extensive attention and attention as a persistent pollutant. Heavy metals are difficult to treat due to their high stability and refractory degradation. Therefore, the treatment of heavy metal polluted groundwater has become a global environmental problem, and its treatment is imminent. [0003] At presen...

AI Technical Summary

Problems solved by technology

Generally, nanometer zero-valent iron is a reactant widely used in permeable reaction wall technology, but nanometer zero-valent iron has the following problems in actual field application: it is easy to agglomerate and oxidize during use, which limits the Mobility and reduction of zero-valent iron, thereby affecting the reactivity and processing efficiency of the material

Compared with nano-zero-valent iron, bimetallic nano-zero-valent iron can significantly improve the reaction activity and processing efficiency, but bimetallic nano-zero-valent iron still has problems such as easy agglomeration and oxidation during use, which cannot meet the needs of practical applications. , and the existing bimetallic nano-zero-valent iron mostly uses noble metals as doping components, noble metals are expensive and may have potential ecotoxicity

In view of the above problems, in the prior art, starch or sodium carboxymethyl cellulose is used to modify the bimetallic nano-zero-valent iron material, although to a certain extent, the problems of easy agglomeration and being easily damaged by the existence of bi-metallic nano-zero-valent iron are alleviated. Oxidation and other problems, but the particle size of these modified bimetallic nano-zero-valent iron materials is large, the dispersion is uneven, and the activity is not high. When used to remediate heavy metal-contaminated groundwater, it still fails to obtain a good remediation effect.

In addition, the preparation methods of these modified bimetallic nano-zero-valent iron have problems such as complex preparation process, high preparation cost, and difficult biodegradation of the dispersant used, which limits the promotion and application of materials in the field of heavy metal-contaminated groundwater.

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