Preparation And Properties Of Oxidized Graphene / Carbon Nanotubes / Sodium Alginate Composites

Graphene Oxide(GO) and Carbon Nanotubes(CNTs) are widely concerned because of its unique structure and huge specific surface area. The distribution of the GO from the edge to the central present hydrophilic to hydrophobic,showing an amphiphilic character. GO can well with CNTs, and GO can be used as dispersant for CNTs. Sodium alginate(SA) is a natural biopolymer, taking SA as raw material to prepare fibers show excellent properties, but its mechanical properties are poor. The addition of carbon nanoparticles can improve the properties of the materials. In this paper, graphene oxide/carbon nanotube composite particles as the filler particles, and the effect of nanoparticles on the polymer is studied by rheological behavior. We have prepared the GO/CNTs/SA composite material and studied its properties.1. The GO/CNTs composite solution with different CNTs contents was prepared by ultrasonic dispersion method, and then use stress-type rotational rheometer to study its rheological properties. GO/CNTs composite solution showed a typical shear thinning behavior, belong to pseudoplastic fluids. The three-dimensional space network structure is formed between GO and CNTs, and has important influence on the rheological properties of GO solution. The sensitivity of GO solution to Na Cl was decreased by CNTs addition, and the formation of fractal structure was weakened.2. We prepared GO/CNTs/SA solution of different nanoparticles content by solution blending method, and then use stress-type rotational rheometer to study its rheological properties. The results show that, GO/CNTs/SA composite solution showed a typical shear thinning behavior, belong to pseudoplastic fluid, the addition of GO/CNTs did not change the type of fluid system. Cole-Cole curves showed that GO/CNTs has good dispersion in aqueous solution. Tensile tests showed that the synergistic effect of GO/CNTs improved the mechanical properties of SA.3. We prepared GO/CNTs/SA composite gel spheres and tested the adsorption properties of MO and MB. The addition of GO/CNTs increased the adsorption capacity of MO, but had little effect on MB. GO/CNTs/SA composite gel spheres can be used as an environment-friendly adsorbent for removal of dye in aqueous solution.