Graphene oxide covalently bonded and coated magnetic nanoparticle composite material and preparation method thereof

Abstract

The invention discloses a graphene oxide covalently bonded and coated magnetic nanoparticle composite material and a preparation method thereof. According to the preparation method, Fe3O4 nanoparticles are prepared, the Fe3O4 nanoparticles are subjected to surface modification and functional group introduction to generate Fe3O4@SiO2-NH2 particles, and the Fe3O4@SiO2-NH2 particles react with graphene oxide so as to coat the Fe3O4@SiO2-NH2 particle surface with the graphene oxide through covalent bonding. Compared to the reported graphene oxide-Fe3O4 composite material, the composite material of the present invention has the following advantages that the structure is improved, the stability is substantially enhanced, and the defects that the Fe3O4 is electrostatically coated with graphene oxide and the Fe3O4 deposits in the graphene oxide sheet layer composite layer are overcome, According to the present invention, the graphene oxide-Fe3O4 composite material prepared through the method has excellent adsorption property for heavy metals, can be reused, and has broad application prospects in the fields of heavy metal sewage treatment and the like, wherein the adsorption process is simple, green, and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, and more specifically relates to a graphene oxide covalent bond-coated magnetic nanoparticle composite material and a preparation method thereof. Background technique [0002] Graphene is a new type of carbon nanomaterial. Due to its unique structure and excellent performance, once it came out, it quickly became the focus of research in the field of international new materials. As an adsorption material for water treatment, the application prospect of graphene materials is worth looking forward to. On the one hand, it has outstanding advantages such as two-dimensional planar structure, open pore structure, good flexibility, high mechanical strength, stable chemical properties, and large specific surface area; on the other hand, carbon nanotubes similar to graphene structure The material shows good adsorption performance, and compared with carbon nanotubes, graphene has a larger specific...

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Problems solved by technology

Fe in this type of composite 3 o 4 It is not very stable. On the one hand, the adsorbed heavy metal ions are also likely to occupy the position of oxygen atoms on the graphene oxide, resulting in heavy metal ions and Fe 3 o 4 Particles compete to occupy the oxygen atom positions of graphene oxide, which may make the Fe 3 o 4 In this way, the structure and performance of the composite material will inevitably be affected, and in the process of adsorption, desorption and regeneration, it is often accompanied by a strong mechanical stirring process, which may make Fe 3 o 4 detach from the graphene surface, but also lead to Fe 3 o 4 There is a reunion problem to some extent

In recent years, some people have tried and prepared graphene oxide electrostatically coated Fe 3 o 4 Nanoparticle composite material (a preparation method of core-shell iron ferric oxide / graphene oxide composite nanocatalyst, application number: 201610310844.5), but this type of composite material has obvious defects in the adsorption of heavy metal ions as an adsorbent, due to graphite oxide Enene is attracted by electrostatic attraction and Fe 3 o 4 Therefore, during the regeneration process, under different pH conditions, the electrostatic attraction will be greatly weakened, resulting in the detachment of the coated graphene oxide from Fe 3 o 4 , the disintegration of the composite material reduces its adsorption performance and ultimately affects its application value

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