Study On Preparation, Characterization And Correlative Properties Of Macrograin Based On

Nowadays, human beings face serious energy and environment problems. Exploring new materials is an effective way to solve these problems. Recently, graphene has been a focus for its excellent properties and great potential value in water treatment, energy storage, photoelectronic device and so on. In our work, graphene oxide(GO) was used to prepare macrostructure materials including GO/starch composite aerogel, ultrathin graphene film and graphene aerogel, the structure and relative properties were studied in our work.A modified Hummers’ method was used to prepare GO. And graphene oxide exhibits excellent dispersibility in water solution. SEM, TEM, FTIR and TGA were used to study the structure of GO.Innovative and porous GO/starch composite aerogels were prepared by a fermentation and steam cooking method. GO/starch composite aerogel was utilized as adsorbent to remove methylene blue(MB) from aqueous solution. Bath adsorption experiments were conducted to investigate the influence of various conditions on the adsorption, including solution pH, absorbent dosage, temperature, initial concentration of MB and contacting time. The experimental data were well described by Langmuir isotherm model and pseudo-second-order model. According to Langmuir model, the maximum adsorption capability was calculate as 127.71mg/g at 293 K. Thermodynamic analysis demonstrated that the adsorption process was endothermic and spontaneous.Ultra-thin and free-standing reduced graphene oxide(RGO) films were prepared by a vacuum filtration method, and the films exhibited excellent flexible and mechanical strength. The electrochemical properties of films were texted in a three-electrode system. Electrochemical curves show typically features of double-layer supercapacitors. The highest specific capacitance is about 200 F/g at 2 mV/s. Cycling test indicate long cycle life and well chemical stability of RGO films.Porous graphene aerogels were prepared by a thermal reduced method. Thermal shrinkage treatment was used to control the pore structure of aerogel. The mechanical properties, electrochemical properties, and electrocapillary imbibition of graphene aerogel were studied.As thermal treatment time goes by, the porosity and elasticity seriously decrease, and the strength and volumetric capacitance have great improvement. In the test of electrocapillary imbibiton, the threshold voltage, on-off switching and saturated imbibitions were investigated in our study.