载铜钙钛矿LaFeO3的制备及其光催化抗菌性能研究

Preparation of Cu-modified Perovskite LaFeO3 and Its Photocatalytic Antibacterial Properties

中文关键词:  光催化  抗菌剂  Cu改性  LaFeO₃

英文关键词:photocatalysis  antibacterial agent  Cu modification  LaFeO₃

中文摘要:

      由于载铜抗菌剂低毒、安全、杀菌广谱, 对真菌和细菌有效, 环境友好, 目前已开始使用铜作为替代银抗菌剂. 采用先取代和后原位析出法制备出Cu修饰的钙钛矿LaFeO₃ (LFO), 并通过X射线衍射(XRD), 紫外可见漫反射光谱(UV-Vis DRS)、扫描电镜(SEM)、透射电镜(TEM)等表征手段对其晶相结构、吸光特性、形貌进行了表征, 评价了其抗菌性能并提出可能的光催化抗菌机理. 添加摩尔分数0.2%的Cu²⁺可以显著提升LaFeO₃抗菌剂在室温下对革兰氏阴性大肠杆菌和革兰氏阳性金黄色葡萄球菌的抗菌性能, Cu²⁺还原后得到的Cu金属修饰的LFO抗菌性能进一步增强, 在规定接触时间内几乎能将大肠杆菌和金黄色葡萄球菌全部杀灭, 抗菌效果均接近100%, 说明Cu修饰的钙钛矿LFO具有良好的光催化抗菌效果.

英文摘要:

      Due to the low toxicity, safety, bactericidal broad-spectrum, effective against fungi and bacteria, and environmental friendly, copper has been used as an alternative to silver antibacterial agents. The Cu-modified perovskite LaFeO₃ (LFO) was prepared by the presubstitution and in-situ exsolution methods, and its crystal structure, light absorption characteristics and morphology were characterized by X-ray diffraction (XRD), UV-Vis diffuse reflection spectroscopy (UV-Vis DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and other characterization methods. The antibacterial properties were evaluated and the possible antibacterial mechanism of photocatalysis was proposed. The addition of molar fraction 0.2% of Cu²⁺ can significantly improve the antibacterial performance of LaFeO₃ antibacterial agent against Escherichia coli and Staphylococcus aureus at room temperature, and the antibacterial properties of Cu-modified LFO were further enhanced after Cu²⁺ reduction, and almost all Escherichia coli and Staphylococcus aureus were killed within the specified contact time, and the antibacterial rate was close to 100%, which shows that the Cu-modified perovskite LFO has excellent photocatalytic antibacterial effect.