Novel process for treating lead-containing waste water by Fe3O4/Ag magnetic nuclear shell nanometer material

Abstract

The invention discloses a novel process for treating lead-containing waste water by a Fe3O4 / Ag magnetic nuclear shell nanometer material. The novel process comprises the following steps: dissolving FeCl3*6H2O and FeSO4*7H2O into a diluted hydrochloric acid solution, stirring to make the materials be dissolved uniformly, and keeping to feed the nitrogen into the solution during stirring to prevent oxidization; adding ammonia water for hydrolysis, raising the temperature of the solution after 20 minutes, preserving the heat at the temperature of 80 DEG C, crystallizing, and separating the Fe3O4 magnetic nanometer particles which are obtained through reaction by an external magnetic field; and diluting the Fe3O4 nanometer particles by deionized water, adjusting the pH by the ammonia water until the pH is equal to 8, adding AgNO3, uniformly stirring, adding a gallic acid solution for reaction, and separating a prepared product by the external magnetic field. According to the novel process, the magnetic nanometer material is used as a matrix, and the gallic acid is used as a functional group for modifying the matrix; the material can absorb a large number of heavy metal lead ions in the solution and can be separated under the action of the external magnetic field, so that the aims of efficiently removing the heavy metal lead ions and purifying the waste water can be fulfilled; and the removal rate is up to 99.5 percent.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, adopts magnetic nanomaterials as immobilized carriers, uses natural organic gallic acid as an active component, and uses the reduction process of Ag ions to modify gallic acid to the surface of magnetic nanomaterials to absorb heavy metals in wastewater lead ions. Suitable for treating wastewater containing lead ions. Background technique [0002] my country is the third largest mining country in the world. There are more than 4,000 mines of various types. The mining, smelting and processing of mineral resources have caused serious damage and pollution to ecology and the environment. It is estimated that the area of ​​directly polluted soil in my country is at least 2 million hectares, and the pollution of water resources such as oceans is even worse. In addition to heavy metal emissions from other industries, my country's heavy metal pollution has reached a level that seriously aff...

AI Technical Summary

Problems solved by technology

Due to the small size of magnetic nanoparticles, they have high surface energy and are often easy to agglomerate to increase the size of the particles, which affects their own magnetic properties.

At the same time, due to the influence of the surface effect, the number of surface atoms increases, so that the nanoparticles have high chemical activity and are easily oxidized in the air, resulting in a decrease in their magnetic properties.