With Spherical Nano Cuprous Oxide As Reductant Preparation Of Gold, Silver Nanocomposite And Its Application In Dye Degradation

Owing to unique physical and chemical properties, cuprous oxide nanospheres have exhibited promising applications in catalysis, sensing, optics, and magnetics. In this dissertation, the spherical cuprous oxide was used as a reducing agent to reduce the aqueous solution of AgNO3and HAuCl4. The different morphologies of silver and gold nanocomposites were obtained and used as crystals to degradate dyes.1Preparation and Characterization of Silver Nanobelts Reduced by Cuprous Oxide NanospheresThe spherical cuprous oxide was used as a reducing agent to reduce the aqueous solution of AgNO3. The different morphologies of silver nanocomposites were obtained by adjusting the concentration of AgNO3and the reaction temperature. The products are characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), UV-vis absorption spectroscopy and energy-dispersive X-ray (EDX). The possible mechanism for the formation of silver nanobelts is discussed. It is found that the architecture of silver crystals is drastically influenced by the concentration of the precursors and the reaction temperature. It is revealed that the CU2O nanospheres might play both reducing agent and growth substrate roles to induce the formation of silver nanobelts. Furthermore, the obtained silver nanocomposites can be used as surface-enhanced Raman scattering (SERS) substrates with high SERS activity and stability for detecting Rhodamine6G (R6G) molecules.2The Decomposition and Decolorization of Dyes in Silver Nanocomposites/H202Fenton-like SystemUnder the silver nanocomposites catalyzed the hydroxyl radical was produced by H2O2decomposition. The hydroxyl radical can made methylene blue, methyl orange degraded completely. Experimental examined the effective of the pH value, the amount of hydrogen peroxide, temperature of the experiment on the reaction. The study also showed the degradation of methylene blue, methyl orange was first order kinetics.3Preparation of CuO/Au Core-Shell Nanospheres and Gold Cage Reduced by Cuprous Oxide NanospheresThe spherical cuprous oxide was used as a hard template and reducing agent to reduce the aqueous solution of HAuCl4. The different morphologies of gold nanospheres were obtained by adjusting the concentration of HAuCl4. The possible mechanism for the formation of gold nanospheres and gold cage is discussed. It is found that the morphologies of gold nanospheres are drastically influenced by the concentration of the precursors and the reaction temperature. It is revealed that the Cu2O nanospheres might play both reducing agent and hard template to induce the formation of gold nanospheres and gold cage.Under the CuO/Au catalyzed the hydroxyl radical was produced by H2O2decomposition. The hydroxyl radical can made methylene blue degraded completely. The study also showed the degradation of methylene blue was first order kinetics.