Ferrite/graphene composite adsorbent and preparation and using methods thereof

Abstract

The invention discloses a ferrite / graphene composite adsorbent and preparation and using methods thereof, and belongs to the technical field of adsorbents. The ferrite MFe2O4 / graphene composite adsorbent is prepared by taking hexamethylenetetramine as a precipitator and a reducing agent and decomposing the hexamethylenetetramine under a hydrothermal condition to generate alkaline and reducing substances by one step. M is Mn, Ni, Co and Zn; the mass percentage of the ferrite is 40-70 percent; ferrite nano particles are dispersed on the sheet type graphene surface; the particle sizes of the ferrite nano particles are 5-30 nanometers; and the specific surface area of the ferrite / graphene composite adsorbent is 60-300 m<2> / g. The ferrite / graphene composite adsorbent has the advantages that the shortcomings of high reaction temperature, non-uniform reactants and low product structure and composition uniformity of the conventional ferrite composite metal oxide prepared by solid phase reaction are overcome; an effect of adsorbing heavy metal ions Cr<6+>, Pb<2+>, Cu<2+>, Cd<2+> and Hg<2+> in water is achieved; and a wide application prospect is realized.

Description

technical field [0001] The invention belongs to the technical field of adsorbents, in particular to a ferrite / graphene composite adsorbent and a preparation method thereof. The adsorbent is used for the adsorption of heavy metal ions. Background technique [0002] In nature, heavy metals mostly exist in the form of simple substances or compounds, so they pose little threat to ecology and humans. However, in order to meet the requirements of rapid industrial development, in recent years due to mining, industrial waste discharge, sewage irrigation and the use of metal Human factors such as human factors make the heavy metals in the environment such as lead, mercury, cadmium, etc. exceed the normal range, resulting in serious environmental pollution. At present, more than 40% of my country's land area is polluted by heavy metal ions, and it is increasing at a rate of 30%. Eventually, it will cause great harm to the human body. Among the heavy metal pollution, water pollution i...

AI Technical Summary

Problems solved by technology

Traditional methods often use direct or indirect calcination in the preparation of ferrite composite metal oxides, so the specific surface area of ​​ferrite composite metal oxides prepared by traditional methods is usually small, and due to the ferrite composite in the nanoscale The magnetism and high surface energy of metal oxides themselves are prone to agglomeration during the preparation and application process, which reduces their adsorption capacity for heavy metal ions. Therefore, how to avoid the use of high-temperature roasting methods to prepare iron oxides with high specific surface area Oxygen composite metal oxide nanoparticles, while avoiding the agglomeration of particles during use has become a bottleneck that limits the application of such materials in the field of heavy metal adsorption

[0004] Since its discovery, graphene has been widely used in catalysis, luminescence, energy storage, sensing and other fields due to its excellent physical and chemical properties. It is an ideal building block. However, the secondary stacking of the two-dimensional sheet structure of graphene is easy to occur, which also brings great limitations to the preparation and application of graphene.

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