Cu-based bimetal oxysulfide for antibacterial application after heat treatment

• Main Authors: Meng-Che Huang, 黃孟哲
• Other Authors: Dong-Hau Kuo
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/30194017642134071512

碩士 === 國立臺灣科技大學 === 材料科學與工程系 === 105 === In this research, Cu-based bimetal oxysulfides were prepared by low temperature hydrothermal synthesis method. The as-prepared precipitates were calcined at different temperatures in a box furnace. The structure and crystallinity of oxysulfides were characterized by X-ray diffractometry (XRD), the morphology by field-emission scanning electron microscopy (FE-SEM), the compositions on Cu, Mn, Ni, O, and S by energy-dispersive spectrometer (EDS) equipped on electron microscope, and the optical absorbtion property by the ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS). For the antibacterial test, we selected Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) as the testing strains. The initial bacterial concentration of 1 × 108 CFU / mL was prepared for antibacterial test in a dark room and in the 20-watt LED light condition. We found that the antibacterial performance became better when the oxysulfides were calcined at higher temperature. The data showed that CuMnOS had performed the excellent antibacterial activity up 99.99% even just calcined at 130 oC for one hour, no matter in the dark or under the LED illumination. Therefore, Cu-based oxysulfides can improve its antibacterial effect by doping and heat treatment. These Cu-based catalysts after the same heat treatment showed much better ability in the light illumination condition to sterilize bacteria than in the dark.