Solution-synthesis And Property Studies Of Copper Nanomaterials

Copper based nanomaterials have become a hot spot for research because of their excellent properties, abundant reserves and low price. The applications of Cu-based nanomaterials, which the preparation method is simple, have generated a great deal of interest in recent years, especially in the field of catalysis and sensor. In this paper, a series of Cu based nanomaterials have been synthesized by wet-chemical method in aqueous solution, The preparation of Cu-based nano-materials with different structures and properties were explored. The optical, dye adsorption and thermal catalytic properties were studied. Specific content as follows:1. At 80 ?, Cu nanoparticles with high activity were synthesized by in acidic aqueous solution, using NaH2PO2 as reductant. By tuning the experimental parameters, such as the acidity of system, the reactants concentrations, the amount of the reactants, Cu nanoparticles with different activities were obtained. The results showed that controlling the reduction rate can improve the activity of Cu nanoparticles, and Cu nanoparticles with the highest activity was synthesized around pH=4.0. Then SiO2 (or TiO2) layers were designed on the surface of Cu nanoparticles to improve the anti-oxidation property. Under the protection of SiO2 layer, the storage stability of high activity Cu nanoparticles were obviously improved. It is found that the deposition environment of SiO2 and the deposit catalyst both have effect on the activity of Cu nanoparticles. Cu nanoparticles achieved higher activity when NH3·H2O or ascorbic acid was chosen as catalyst. The thermal catalytic properties of high activity Cu nanoparticles were studied by using AP as a model. The high decomposition temperature of AP was reduced from 453.59 ? to 277.45 ?.2. At 60 ?, octahedral Cu nanocages were first synthesized in alkaline environment using hydrazine hydrate as reducing agent. The influence of different surfactants on Cu nanostructures were studied. And it was characterized by XRD, SEM and UV-vis. With the assistance of SOA (anionic surfactant), octahedral Cu nanocages were obtained. While octahedral framework Cu nanostructures were synthesized when PVP (non-ionic surfactant) was employed. This result is attributed to the different absorption site of different surfactant. With SOA and PVP K30 mixed surfactant, not only to maintain the octahedral Cu nanocages structure, but also to make the sample is not easy to be damaged, and it has good performance in degradation of methyl orange.3. At 70 ?, based on the octahedral Cu nanocages, a series of Cu-ZnO nanocomposites with different ratios were synthesized by deposing ZnO nanocrystals on octahedral Cu nanocages., The optical and dye adsorption properties of the Cu-ZnO nanocomposites were studied. Comparing to the pure octahedral Cu nanocages and pure ZnO nanocrystals, the synthesized Cu-ZnO nanocomposites exhibited excellent absorption properties toward methyl orange (MO) dye. And the absorption efficiency increased as the ZnO content increased. The recycle experiments showed that the adsorption efficiencies of the Cu-ZnO nanocomposites were 98.95% at the first time, 95.66% at the second time and 17.79% at the third time.