Copper oxide nanoparticles-loaded zeolite and its characteristics and antibacterial activities

摘要

In the present work, a simple and green co-precipitation method was used to prepare copper oxide-zeolite nanocomposites(CuO-zeolite NCs). The weight ratio(1, 3, 5, 8 and 10 wt%) of CuO nanoparticles(NPs)loaded into zeolite was investigated to obtain the optimum CuO distribution for antibacterial activities.The prepared CuO-zeolite NCs were characterized by ultraviolet-visible(UV–vis) spectroscopy, Fourier transform infrared(FT-IR) spectroscopy, powder X-ray diffraction(XRD), and energy dispersive X-ray fluorescence spectrometry(EDXRF). The transmission electron microscopy(TEM) and field emission scanning electron microscopy(FE-SEM) revealed a uniform surface morphology of the CuO-zeolite NCs.The UV–vis spectrum of NCs showed absorption peaks between 230 and 280 nm for nano-CuO in the XRD patterns, and new peaks appeared between(36.56?–38.83?) related to the CuO. At weight ratio less than 10 wt%, the CuO nanoparticles loaded to the zeolite exhibited spherical shapes with average particle diameter of 6.5 nm measured by TEM and XRD. Antibacterial activities were tested against Gram-negative and Gram-positive bacteria. The obtained results showed that, CuO-zeolite NCs with 8 wt% CuO nanoparticles had the highest antibacterial activities against Bacillus Subtilis B29 and Salmonella Choleraesuis ATCC10708, which can be attributed to the good dispersion of CuO NPs on the zeolite surface.