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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%。
The ZnO / ZnAl2O4 nano-heterojunction photocatalyst was prepared by coprecipitation. The samples were characterized by HRTEM, TEM, XRD, BET, TG-DTA and UV-Vis DRS. The photocatalytic activity of the sample was evaluated by measuring the photocatalytic degradation rate of methyl orange solution and the killing rate of E. coli under simulated sunlight. The composition of the catalyst, the calcination temperature, the amount of the catalyst and the effect of different light sources on the photocatalytic activity of the sample were investigated. The results show that when the molar ratio of Zn to Al in the raw material is 1: 1.5, the catalyst calcined at 600 ° C has the best photocatalytic activity. The degradation rate of methyl orange in 1.0 g / L photocatalyst was 98.5% under simulated solar irradiation within 50 min. The sterilization rate of E.coli (106 CFU / mL) within 60 min under the same conditions reached 99.8%.