The Preparation, Characterization And Study On Performance Of Nanocomposites Based On Graphene Oxide

In this thesis, graphite oxide was prepared via a modified Hummers’method. After which, by employing graphene oxide (GO) as precursor, nanocomposites based on GO were synthesized by a simple sol-gel polymerization. Absorption capacity for various organic of these resulting materials was also discussed.GO and nanocomposites were characterized by means of Scanning electron microscope (SEM), Transmission electron microscope (TEM), X-ray diffraction (XRD), Raman, Infrared spectroscopy (IR), X-ray photoelectron spectroscopy (XPS) and Thermal gravimetric analyzer (TGA). The analysis results of the SEM, XRD, Raman and IR showed that graphite oxide was successfully prepared using modified Hummers. And these outcomes also indicated that during the high thermal reduction, the GO successfully change into graphene in these nanocomposites. TGA showed that the thermal stability of resorcinol/formaldehyde-GO carbon aerogel (RF-GO carbon aerogel) and hydroquinone/formaldehyde-GO nanocomposite (HFG) are higher than that of GO. XPS demonstrated that the valence of titanium is+4in the TiO2-GO nanocomposite, and confirmed that the oxide in the sample was TiO2, meanwhile the XRD and Raman showed that the TiO2were mixture of anatase and rutile.Nitrogen adsorption-desorption isotherm showed that the BET surface area of RF-GO carbon aerogel, HFG and TiO2-GO nanocomposite were618m2g-1,427m2g-1and134m2g-1; t-plot micropore area were156m2g-1,74m2g-1and31m2g-1; pore volume were1.1687cm3g-1,1.2764cm3g-1and0.1437cm3g-1, respectively. More interesting, all these resulting materials showed mesopore structure. After treated by polydimethylsiloxane (PDMS), the surface wettability of these resulting materials changed into hydrophobic with water contact angle (CA) of144°,148°and153°for RF-GO carbon aerogel, HFG, TiO2-GO nanocomposite. Absorption measurement for various organic demonstrated that the absorption capacity of RF-GO carbon aerogel, HFG, TiO2-GO nanocomposite were6.00-13.37g g-1,6.39～25.00g g-1and228～1167%, respectively. So these resulting materials can be candidate for removal of organic contaminants from water.The HFG also can be used as anode for lithium ion batteries due to the porosity and thermal stability.