Method for treatment of hexavalent chromium water with modified iron-copper bimetallic nanoparticles

Abstract

The invention discloses a method for treatment of hexavalent chromium water with modified iron-copper bimetallic nanoparticles. The method includes the steps of: mixing the modified iron-copper bimetallic nanoparticles with hexavalent chromium water, and performing constant temperature treatment to complete treatment of hexavalent chromium water. Specifically, the modified iron-copper bimetallic nanoparticles include chitosan and iron-copper bimetallic nanoparticles, and the chitosan is coated on the surfaces of iron-copper bimetallic nanoparticles. The method for treatment of hexavalent chromium water with modified iron-copper bimetallic nanoparticles provided by the invention has the advantages of simple operation, low cost, short treatment period, high reaction efficiency and the like,can treat high concentration Cr (VI) polluted underground water, also has a wide pH application range, thus being a novel restoration method that has good application prospects and can effectively remove Cr (VI) from underground water.

Description

technical field [0001] The invention belongs to the field of treatment of hexavalent chromium-polluted water bodies, and relates to a method for treating hexavalent chromium water bodies, in particular to a method for treating hexavalent chromium water bodies with modified iron-copper bimetallic nanoparticles. Background technique [0002] With the rapid development of the economy and the acceleration of urbanization, a large amount of untreated industrial wastewater, random stacking of solid waste, and the use of a large amount of pesticides and fertilizers have caused a variety of heavy metals to continuously enter the environment and seep into groundwater. As a persistent pollutant, heavy metals have received extensive attention and attention. Due to the high stability and refractory nature of heavy metals, it is difficult to treat them. Therefore, the treatment of heavy metal polluted wastewater has become a global environmental problem, and its treatment is imminent. ...

AI Technical Summary

Problems solved by technology

As a commonly used nanomaterial, nano-zero-valent iron is widely used in the treatment of heavy metal-polluted wastewater. However, nano-zero-valent iron has the following problems in actual field applications: it is easy to agglomerate and oxidize during use, which limits The mobility and reducibility of nano-ZVI, which affects 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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