Preparation And Properties Of Well-dispersed Graphene Composites

In order to improve the dispersion of graphen GN,GN was dispersed well in the polymer film and porous materials.The effects of GN on mechanical properties,adsorption and electrochemical properties were researched here.In this work,GN-PVA was prepared through grafting PVA onto the surfaces of graphene.In views of poor mechanical properties and poor moisture barrier of the PVA films,GN-PVA was disperserd well in PVA matrix to obtain GN-PVA composites.Compared with PVA films,GN-PVA/PVA composites exhibited better tensile strength and moisture barrier.GN-PVA/PVA composites could protect against UV light.The graphene oxide-polyvinyl alcohol(GP)gels with 3D network were also fabricated using a simple process of aqueous gel freezing,solvent exchange,and ethanol drying,then get the GPCs gel modified with CS2,and studied the adsorption capacity of lead ions.The effects of contact time and Initial lead ion concentration on the adsorption process and results were investigated.The kinetic adsorption and isotherm data fit the pseudo second-order kinetic and the Langmuir isotherm models,respectively.The maximum adsorption capacity of Pb2+ reached 242.7 mg/g.And GPCs for Pb2+ adsorption could be regenerated with ethylenediamine tetracetic acid(EDTA)solution for repetitious adsorption,it is easily detached from the solution.Pyrrole monomer occurs oxidative polymerization on GO surface to obtain PPy/GO composites.The adsorption of Cr2O72-was studied by PPy/GO composites including the effects of GO and PPy ratio,temperature,the initial concentration of Cr2O72-.The adsorption process well followed the pseudo second-order kinetic model and Langmuir isotherm models,maximum adsorption value reached 363.23mg/g.Therefore,GO composites have great prospects for the treatment of industrial waste water.