| Graphene was very high specific surface area, which was discovered the highest intensity of the material to the present and becomed a hot research topic in new rising materials. The surface of graphene oxide（GO） riched in lots of carboxyl, hydroxyl and epoxy group. GO was easy to disperse in water and other organic solvents, which was currently the most popular direction in the study of functional graphene nanocomposites. In view of the increasingly pollution of dye wastewater, the following functions of graphene nanocomposites were synthesized, and the adsorption and catalytic properties were studied.Polyamidoamine（PAMAM） dendrimers with graphene as core encapsulated Co nanocomposites, which was prepared by chemical reduction method. The samples were characterized by means of FTIR, TG, XRD and TEM. The effect of p H value, adsorption time and temperature conditions on the third generations of PAMAM dendrimer with graphene as core nanocomposite(G3.0-PAMAM/Co) tested for Congo red adsorption performance were studied. The results showed that G3.0-PAMAM/Co was strong magnetic adsorbent for Congo red. The adsorption process of Congo red on G3.0-PAMAM/Co could be described with the Lagrangian pseudo-second-order kinetic model. The results indicated that the adsorption process was mainly chemical adsorption. The thermodynamics of Congo red adsorption on the G3.0-PAMAM/Co followed the Langmuir adsorption equation. The maximum adsorption amount was 161.49 mg/g.The synthesis of G3.0-PAMAM/Ag nanocomposites was prepared successfully by grafting from polyamide-amine dendrimers（3.0 G） modified graphene oxide, served G3.0-PAMAM as a template and used sodium borohydride as reducing agent. The structure of products has been characterized by means of FTIR, XRD and TG, and the formed of Ag nanoparticles size was uniformed distribution on the surface of G3.0-PAMAM. The circulation test of G3.0-PAMAM/Ag nanocomposites showed that the electrode modified with G3.0-PAMAM/Ag nanocomposites had obvious electrochemical activity compared with the bare electrode. In addition, the results showed that the G3.0-PAMAM/Ag nanocomposites electrode had high electric catalytic reduction performance onto p-Nitroaniline.In addition, the research synthesized graphene oxide（GO） and carboxyl graphene oxide（GO-COOH） based on Hummers method. The synthesis of PAMAM/GO-COOH/ Co nanocomposites was prepared successfully by chemical cross-linking methods to polyamide-amine dendrimers（4.0 G） modified carboxyl graphene oxide, served PAMAM/GO-COOH as a template and used sodium borohydride as reducing agent. The structure of products has been characterized by means of FTIR, XRD, TEM and TG, and the formed of Co nanoparticles size has been uniformed distribution on the surface of PAMAM/GO-COOH. Moreover, compared with the GO-COOH/Co nanocomposites, the PAMAM/GO-COOH/Co nanocomposites performed excellent catalysis on degradation of p-Nitroaniline aqueous solution without other reagents in experiments, the catalytic decomposing of the p-Nitroaniline was recorded by the successive measurements of an ultraviolet-visible spectrometer.G3.0-PAMAM/Co, G3.0-PAMAM/Ag and PAMAM/GO-COOH/Co were prepared, the adsorption and catalytic degradation of organic compounds in the dye wastewater were studied, which was laid a good theoretical basis for the treatment of dye wastewater. |
