Design Synthesis And Performance Research Of Graphene Oxide-based Hydrogels

Graphene oxide is a kind of important derivative of graphene, and it is a kind of excellent performance of new carbon materials. GO has high specific surface area and abundant surface functional groups, due to its surface there are a lot of the epoxy groups and hydroxyl and carboxyl oxygen containing functional groups. These provide the surface functionalization of GO modified reflex point. At the same time these oxygen-containing functional groups of hydrophilic can make it in the water to form a stable colloidal dispersion system. To improve dispersion of graphene oxide composite materials in the water is extremely advantageous.Self-assembly is a most practical technique to integrate all kinds of micro materials into macroscopic materials with interesting properties. These self-assembled super structures which have been endowed with various practical applications exhibit novel collective physiochemical properties. As a kind of nove self-assembled materials, gels are the products of the gelation of suitable organic solvent or water. Gels have the ability to organize into orderly 3D network structure.In this paper, graphite oxide was prepared by employing Hummers method, and then would attain GO after ultrasonic dispersion. At last, we design and synthese the GO-DETA hydrogel, GO-DETA hydrogel by self-assembly. The identity of the hybrid materials was confirmed using transmission electron microscopy(TEM), scan electron microscope(SEM), atomic force microscope(AFM), X-ray diffraction(XRD),thermogravimetric analysis(TG/TGA), Fourier transform infrared spectroscopy(FTIR)and Raman.In order to study the removal ability of GO-DETA hydrogel and GO-DETA hydrogel,the research of three dyes( rhodamine B, methylene blue, congo red) and two kinds of metal ions( Cu2+, Pb2+) were absorbed onto the GO-hydrogel was carried out in this paper.The effect of p H and mass concentration to removal efficient has been discussed in detail.In addition, groups of experiments were designed to investigate the kinetics and thermodynamics of dyes adsorption onto the GO-hydrogel for the purpose of adsorption mechanism research.The result indicated that the prepared GO had a two-dimensional honeycomb lattice structure, on whose surface there were many folds. The GO-DETA hydrogel and GO-TETA hydrogel of fold, porous nanostructures, Three-dimensional network nanostructures were obtained through the self-assembly of graphene oxide and multi-amine molecules. In addition, the adsorption behavior of this new adsorbent fits well with the Freundlich isotherm and the pseudo-second-order kinetic model, which means that the absorption behavior of GO- hydrogel to cationic dye was chemical absorption and multilayer absorption.