Study On Catalyst Preparations And Properties Of Organic Alkali Functionalized Graphene Oxide

Because of its unique two-dimensional structure, graphene has been widely used on the thermal, electrical, mechanical and optical, but also become a research hotspot of the physical chemistry and materials science. Graphene oxide is usually treated as a precursor to graphene, and it can be easily functionalized for a variety of novel materials preparation because of its surface has a lot of oxygen containing functional groups. In this paper, we used graphite oxide as the carrier, and prepared the heterogeneous catalysts by modifying the surface, and studied the catalytic properties. The main research content is as follows:(1) The two kinds of graphite oxide(HGO, BGO) were prepared by Hummers method and Brodie method, and then used as the carrier respectively, followed by reacting with(3-Aminopropyl)triethoxysilane, at last obtained two kinds of heterogeneous catalysts(HGO-APTS, BGO-APTS). The catalysts were characterized by using elemental analysis、FT-IR、TGA、XRD、XPS. The catalytic cativity experiment indicates that the catalyst BGO-APTS showed superior catalytic activity in different aldehydes and acetone condensation reaction. The conversion of nitrobenzene formaldehyde can be reached to 97.8% after 2 h in 80 °C, and The catalyst can be recycled seven times, besides the percent conversion can also be reached over 94% in other aldehydes condensation reaction, but there was only 27.5% percent conversion in Aldol reaction catalyzed by HGO-APTS in same condition. At the same time, the Henry reaction was also catalyzed by GO-APTS, and more than 97% yield at different aldehydes with nitromethane reaction.(2) The heterogeneous catalyst BGO-TMG was prepared by modified 1,1,3,3-Tetramethylguanidine(TMG) on BGO. The catalyst were characterized by using elemental analysis、FT-IR、TGA、XRD、XPS、TEM. GO-TMG exhibits a superior catalytic performance with good yields, mild reaction conditions in different aldehydes and acetone condensation reaction. The conversion of nitrobenzene formaldehyde can be reached to 97.3% at 30 °C after 1 h, and the catalyst can be used four times without significant loss of catalytic activity.