Facile Preparation of Cu/TiO_2Nanocomposite via Photocatalysis and Their Antibacterial Performance

摘要

Cu/TiO_2 nanocomposite was first prepared by photocatalytic reduction according to optimal processing condition selected via orthogonal test: 2.0% of glucose, 0.25% of TiO_2, 0.3% of CuCl_2 and reaction time of 12 h. Multiple characterization methods were utilized to confirm the structure of Cu/TiO2 nanocomposite, and its antibacterial property against Escherichia coli (E.coli) was then investigated in detail. The obtained Cu/TiO_2 (ca. 50 nm) was composed of elemental copper, TiO_2 and a small amount of unreacted CuCl_2. EDTA titration and XRF indicated that solid content of Cu was about 61.68%. Antibacterial test showed that the inhibition zone diameter of Cu/TiO_2 with 1% solid content is 15.77 mm and the minimum bactericidal concentration (MBC) of which is 5 mg/mL. Furthermore, Cu/TiO_2 (1.0 wt%) was added into a super-hydrophilic coating for the aluminum cooling fin of air conditioner. The antibacterial ability of the fin can be significantly improved without obvious changes of hydrophilicity, which can reach the national standard (grade I).