The Construction Of 3D Nanoparticle/Graphene-based Composite Materials By Supramolecular Self-assembly And Their Catalytic Performance

It is well known that graphene has a wide range of applications due to its outstanding properties.Nevertheless,in practical applications,graphene is applied to support metal/metal oxide nanoparticles?NPs?to integrate the multiphase performances into a composite material for better performance.Moreover,graphene is usually prepared into three-dimensional?3D?materials,which can not only prevent the severe stack and irreversible agglomeration of graphene,but also enable the NPs to be evenly distributed on graphene.Hence,the preparation of NPs modified 3D graphene composites is of great significance for scientific research.Although great achievements have been made in the preparation of NPs-modified3D graphene composites,several challenges still exist.Firstly,the preparation of graphene usually involves the use of additional reagents,which leads to a reduction in the active sites of the composites.Secondly,the preparation of 3D graphene composites usually involves high temperature and high pressure rather than room temperature,which further limits the mass production of 3D graphene composites.To solve the above problems,this paper proposes a new idea,that obtaining 3D graphene composites by creating coordination polymer with layered structures.T he specific work includes the following two steps:to begin with,Zn?MAA?₂microflowers with layered structures were obtained through the desolvation process MAA^-and Zn²⁺;furthermore,ZnO NPs modified 3D graphene materials were obtained by pyrolysis of Zn?MAA?₂ microflowers.The catalytic performance of ZnO/graphene microflower nanocomposites was measured by photocatalytic degradation of rhodamine B.The results showed that the degradation rate of Rhodamine B reached 98.1%.Furthermore,due to the particularity of MAA^-structure,according to the hard and soft acid-base theory,the Pd²⁺can coordinate with the olefin unit in MAA^-to prepare Zn?MAA?₂/Pd???bimetal coordination polymers.The bimetal coordination polymer can serve as the precursor of the dual-NPs modified 3D graphene materials.The experimental results showed that the catalytic degradation rate of the 3 D graphene material modified with dual-NPs of Rhodamine B reached 97.3%,and the kinetic reaction constant of the system was0.37 min^-1 for the catalytic hydrogenation of p-nitrophenol.