M^(2+)(M=Cu、Cd、Ag、Fe)掺杂氧化锌纳米粉晶的抗菌性能

Antibacterial Activities of Doped ZnO Nano-Powder with M^(2+)(M=Cu,Cd,Ag and Fe)

采用柠檬酸溶胶-凝胶法制备了ZnO及M2+掺杂ZnO纳米粉晶(M=Cu、Cd、Ag、Fe),用现代测试技术表征了样品的组成、结构和形貌,以大肠杆菌(Escherichia coli)、金黄色葡萄球菌(Staphylococcus aureus)和白色念珠菌(Candida albicans)为测试菌株,用抑菌圈、最小抑菌浓度和最小杀菌浓度等方法研究了样品在日光照射下的抗菌活性。结果表明,与母体ZnO相比,Cu、Ag、Cd掺杂样品的抗菌性能明显地增强,这可能是由于掺杂金属离子置换Zn2+生成了晶格缺陷和电荷缺陷,阻止了光生电子和光生空穴对的复合从而增强了光催化活性和抗菌活性。

ZnOand doped ZnOnano-powder with M2＋（M=Cu, Cd, Ag and Fe ） were synthesized by citrate sol-gel method. The composition,structures and morphology of the samples were characterized by means of modern testing techniques. The antibacterial activities of the samples against Staphylococcus aureus, Escherichia coli and Candida albicans were carried out using inhibition zone, minimum inhibitory concentration and minimal bactericidal concentrations methods in the sunlight. Results showed that the antibacterial activity of samples doped with Cu, Cd and Ag enhanced obviously compared to ZnO, which may be because that the lattice and charge defects produced by M2＋ ions replaced Zn2＋ prevented the photogenerated holes and electrons from recombining and enhanced the photocatalytic activity and antibacterial activity.