Study On Cu～(2+)/TiO₂ Antibacterial Material And Its Antibacterial Evaluation To Plant Bacterial Diseases

Based on current researching achievements of inorganic antibacterial agents, two antibacterial materials of TiO₂ sol and Cu²⁺/ TiO₂ sol were prepared by sol- gel method in this paper. It had been proved that the antibacterial materials have good photocatalysis activity through the experiments of photo-degradation methyl blue. The antibacterial experiments showed that TiO₂ sol and Cu²⁺/ TiO₂ sol have excellent antibacterial effects on plant pathogens.Through the process of preparing the antibacterial TiO₂ and Cu²⁺/TiO₂, change the contain of Ti(SO₄)₂ and copper ion we can obtain a series of TiO₂ sol and Cu²⁺/ TiO₂ sol.The samples were tesed by XRD,SEM,TEM methods, the result showed that the TiO₂ we prepared were anatase, and the 20of 25.42°,37.77°and 48.00°belong the diffract apex of 101,004 and 200 separately. The distributing range of TiO₂ grains are in 3.9nm-97.9nm, the effective diameter is 63.6nm and the polydispersity is 0.222. The effective diameter of Cu²⁺/TiO₂ is 58.4nm, the polydispersity is 0.237.The test result showed that the diameter of Cu²⁺/TiO₂ sol is little than TiO₂, then the photodegradation effect is better than TiO₂ sol.The experiment of methyl blue photodegradation showed that polymerization time is 8h, and the concentration is 1.5%, TiO₂ sol have the optimal photocatalytic effective. The optimal proportion of copper ion is 0.5%.It had been proveded in antibacterial experiments that both sols possess broad-spectrum and effective antibacterial properties which antibacterial rates can reach 100% with extending in illumination time, and no significantly differences exist among different species of plant pathogens. The antibacterial abilities of Cu²⁺/TiO₂ sol are better than TiO₂ sol which lost its antibacterial activities without illumination. In addition, security evaluation tests revealed that TiO₂ and Cu²⁺/TiO₂ sol are safe to health.The study of our experiments implied that TiO₂ and Cu²⁺/TiO₂ semiconductors sol may be developed as a fungicide in preventing from plant diseases.