【作者】 张丽； 黄可龙； 陈浩； 李扬； 阎建辉；

【Author】 ZHANG Li~(1,2),HUANG Ke-long~2,CHEN Hao~(1,2),LI Yang~1,YAN Jian-hui~(1,2) (1.School of Chemistry and Chemical Engineering,Hunan Institute of Science and Technology, Yueyang 414000,China; 2.School of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China)

【机构】 湖南理工学院化学化工学院； 中南大学化学化工学院；

【摘要】 采用溶胶-凝胶法制备了纳米CuFe₂O₄光催化剂,并通过TEM,XRD和UV-visDRS对其进行表征,表明样品是由粒径约为80nm粒子组成,晶体结构均匀,具有良好的可见光吸收性能。以大肠杆菌为研究对象,考察了光催化剂在模拟太阳光照射下的杀菌性能。结果表明,CuFe₂O₄光催化剂杀菌性能随着焙烧温度的不同而变化,当焙烧温度为700℃时,杀菌效果最佳,光照60min后,细菌的存活率仅为5.6%,而在相同条件下使用催化剂避光和不用催化剂光照时细菌存活率分别为94.4%、87.4%,说明该催化剂本身无毒性,是一种在可见光下有优良杀菌性能的光催化剂。更多还原

【Abstract】 Photocatalysts of CuFe₂O₄ was synthesized by a facile citric acid（CA）-assisted sol-gel method,and characterised by transmission electron microscopy（TEM）,X-ray diffraction（XRD） and UV-vis diffuse reflectance spectrum（UV-vis DRS）.The sample prepared has a good solar light absorption ability and composed of almost uniform nanoparticles with a grain size of about 80nm and crystallized in a tetragonal crystal phase structure. Then the photocatalytic inactivation of Escherichia coli under simulated solar light irradiation（λ=200- 900nm） was performed with the photocatalyst to investigate the photocatalytic bactericidal capability.The results showed that CuFe₂O₄ has different sterilization activity with the change of the calcination tempreature. when the calcination temperature is 600℃and photocatalyst exhibited the optimal photocatalytic sterilization activity, The survival ratio of Escherichia coli is only 5.6%upon 30 min irradiation,whereas that without photocatalyst as a control and with no light irradiation as a dark control were 94.4%and 87.4%respectively under the same conditions.It is shown that CuFe₂O₄ has no toxic itself and is a good visible-light photocatalyst.更多还原