Synthesis And Catalytic Tests Of Functionalized Graphene Oxide Materials

Carbon, can be said to be one of the elements that people first contacted and used,which plays an important role in the history of human development. In recent years,with new materials become the focus of scientific research, carbon materials alsogradually got the attention of researchers. From our traditional understanding ofdiamond, graphite and amorphous carbon, to fullerenes which is discovered more thantwenty years ago, to carbon nanotube which is more than a decade ago, and to graphenewhich is discovered in recent year, kinds of carbon materials has entered people’s fieldof vision, scientists are continually research the properties and potential application ofthese materials. Especially after the year2004, Andre K. Geim and his collaboratorsfirst successfully prepared graphene which can exist independently. Graphene basematerials has been widely researched and made good achievements in optical, electrical,biological medicine, energy storage, catalysis and many other fields. In this paper, wemainly discuss the catalytic applications of functionalized graphene oxide materials.First of all, we utilized the hydroxyl groups on the surface of graphene oxide,grafting the silane coupling agent KH550, successfully modified the graphene oxidewith amino groups. Then added salicylaldehyde, salen ligand was formed under certainconditions, and then complex of Co (Ⅱ) to synthesise the Salen-Co ligand. Accordingto the13C NMR, FT-IR, XPS analysis method, we are sure that Salen-Co ligand wasmodified onto graphene oxide successfully. This catalyst gave similar product yieldcompared with homogeneous catalyst in cyclohexene oxidation reaction, and has theadvantages of separated easily, repeatable use, it has the potential of industrialapplication. Secondly, we also try to graft amino groups onto graphene oxide, then addedmethyl iodide or1,3-propane sultone, amino groups transform to quaternary ammoniumsalt, then treated with sulfuric acid or trifluoromethane sulfonic acid. Four kinds of ionicliquid modified graphene oxide was obtained. According to the FT-IR, XPS analysismethod, we are sure that ionic liquid were modified onto graphene oxide successfully.This heterogeneous catalyst gave much higher product yield compared with thetraditional homogeneous catalyst sulfuric acid in the esterification of lactic acid reaction.and has the advantages of separated easily, repeatable use, it has the potential ofindustrial application.