ZnO/ZnAl2O4异质结光催化剂的光催化降解和杀灭大肠杆菌性能

摘要

通过共沉淀法制备ZnO/ZnAl2O4纳米异质结光催化剂，利用HRTEM、TEM、XRD、BET、TG-DTA和UV-Vis DRS 测试方法对样品进行表征。在模拟太阳光照射下，通过测定甲基橙溶液的光催化降解率和对大肠杆菌的杀灭率来评价样品的光催化活性。研究催化剂的组成、焙烧温度、催化剂的用量和不同光源对样品光催化活性的影响。结果表明，当原料中Zn与Al摩尔比为1：1.5时，在600°C焙烧所得的催化剂具有最佳光催化活性。在模拟太阳光照射下，在50 min内1.0 g/L光催化剂对甲基橙的降解率达98.5%；在60 min内，在相同条件下对大肠杆菌(106 CFU/mL)的杀菌率达到99.8%。%ZnO/ZnAl2O4 nanocomposites with heteronanostructures were successfully prepared by co-precipitation method. The as-prepared samples were characterized by HRTEM, TEM, XRD, BET, TG-DTA, and UV-Vis spectra techniques. The photocatalytic activities of the as-prepared samples were evaluated by the photocatalytic degradation of methyl orange and inactivation of Escherichia coli in suspension under the irradiation of the simulated sunlight. The effects of compositions, calcination temperatures, concentration of photocatalysts and light source on the photocatalytic activities were systematically studied. The results show that when the concentration of ZnO/ZnAl2O4 photocatalyst with the starting Zn to Al molar ratio of 1:1.5 calcined at 600 °C is 1.0 g/L, the maximum photocatalytic degradation rate of 98.5% can be obtained in 50 min under the irradiation of the simulated sunlight. Under the same conditions, an inactivation rate of 99.8%for E.coli is achieved in 60 min.