Study On The Preparation Of Ionic Liquid Functionalized Graphene And Adsorption Of Heavy Metal Ions

Graphene has two-dimension honeycomb network structure with six-memberedrings which are composed of monolayer carbon atoms with sp²–hybridization， andthis results in particular characteristics, such as excellent electrical properties, specificmagnetism and high thermal conductivity. Its superior mobility of charge carriers duesto its zero band gap structure, and its particular mechanical properties due to its largecoherence length and specific surface area. Graphene, as a rising star of nanomaterials, has been fabricated by some different methods, including chemical vapordeposition （CVD）, micromechanical exfoliation of graphite, epitaxial growth, graphiteoxides methods and so on. Graphene itself is also used as building blocks to producefunctional graphene composite with metal oxide, organic molecule or polymer.Usually, graphene oxide was obtained from graphite as the precursor of the reaction,such as functionalization of graphene sheets through fullerene attachment and thesynthesis of SnO₂/graphene. However, the preparation of graphene oxide must via afew steps. Here, we synthesize graphene composite through a mild and environmentalelectrochemical method.Ionic liquid （IL） is a kind of solvent composed of ions, and their exceptionalcharacters, such as non-volatility, high ionic conductivity, non-flammability, highthermal and chemical stabilities and an enhanced solvation ability for somecompounds, get it more extensive application. The functional materials （GNS^A） wereobtained by one step with graphite rods as electrodes and ionic liquid [A336][P507]as electrolyte. XPS, FT-IR, SEM and UV are used to characterize the materials.Along with the development of industry, heavy metal ions in industrialwastewater discharged into water system lead threaten to human and aquaticorganisms. In this report, we adopts adsorption to refine Pd（II） and Cd（II） solutionsusing [A336][P507] functionalized graphene as adsorbent.In addition to the inherent quality of the material itself, we also investigated howenvironmental factors affected the adsorption capacity, such as pH, contact time andinitial concentration, and the regeneration tests of the materials were also performed.