可见光下钙钛矿LaCoO_3光催化杀菌性能的应用研究  

Study on the antibacterial performance of perovskite LaCoO_3 under visible light illumination

作　　者：吴维维[1] 张虹[1] 常思思[1] 高敬[1] 贾立山[1] 

机构地区：[1]厦门大学化学化工学院化学工程与生物工程系,福建厦门361005

出　　处：《化工时刊》2009年第7期25-28,42,共5页Chemical Industry Times

基　　金：福建省科技计划项目(2005Y21022);厦门大学创新实验计划项目支持

摘　　要：采用柠檬酸配合法制备纳米钙钛矿型LaCoO3及Sr掺杂的La0.9Sr0.1CoO3。在可见光下考察了催化剂浓度、菌液浓度对LaCoO3杀菌性能的影响。结果表明,在以30W日光灯为光源,距光源20cm处,辐照30min时,当菌液浓度为102～104cfu/mL,对大肠杆菌的杀菌率达90%以上,金黄色葡萄球菌46%。Sr掺杂后La0.9Sr0.1CoO3杀菌率分别可达98%,52%。通过XRD、SEM、DRS表征分析表明,催化剂粒径为60～80nm,在大于400nm的可见光区均有较好的吸收,Sr掺杂有助于提高杀菌效果。通过溶胶提拉法在瓷砖上附着钙钛矿膜,膜表面的杀菌率仍可保持在80%,40%以上。Perovskite LaCoO3 and La0.9 Sr0.1CoO3 were prepared by citrate complex method. Under the visible light, the influence of the photocatalysis activity was studied to some factors, such as the amount of catalyst, the strength of bacterial. The result showed that when the concentration of bacteria was 102 - 104cfu/ml and the intensity of illumination was 30W （20 cm away from the lamp）, the bactericidal rate to E. coli was over 90% ,while 46% to Staphylococcus aureus . Even when Sr doped the bactericidal rate of La0.9Sr0.1 CoO3 was able to reach 95% ,52%. The XRD,SEM,DRS were adopted to characterize the catalysts, which showed that they both had perovskite- sype and the diameter of the particle were 60 - 80 nm. What＇s more, they had good absorption of the wavelength of visible light greater than 400 nm, especially La0.9Sr0.1CoO3.

关 键 词：钙钛矿 光催化 杀菌 可见光 

分 类 号：O643.36[理学—物理化学]