氧化锌基纳米材料光降解亚甲基蓝的活性研究

Photocatalytic activity study on degradation of methylene blue by zinc oxide based nanomaterials

采用湿化学方法合成纳米ZnO粉体.利用光催化反应仪,以亚甲基蓝作为模型污染物,用紫外-可见分光光度计研究其光催化降解有机染料的过程.分别考察pH值、常见无机阴离子（NO3-,SO42-）、卤素离子（F^-,Cl^-,Br^-）及不同合成方法对ZnO光催化活性的影响,并用傅里叶红外光谱仪对ZnO的光催化反应机理进行了探讨.试验结果表明pH=10是ZnO光催化的最优酸度.在溶液中加入无机阴离子（NO3-,SO42-）和卤素离子（F^-,Cl^-,Br^-）均会不同程度地抑制光催化效果,抑制作用表现为NO3-〉SO42-,卤素离子抑制作用表现为Br^-〉F^-〉Cl^-.

ZnO powder was used as photocatalyst,and methylene blue was the research object,thus,UV-Vis was used to analyze the photo-catalytic degradation.Influence of pH and some kinds of anions（NO_3^-,SO_4^（2-）,F^-,Cl^-,Br^-） to the degradation of methylene blue were investigated.Besides,the mechanism of photocatalytic reaction of ZnO was studied by Fourier transform infrared spectroscopy（FTIR）.Experiment results show that pH=10 is the optimal acidity of the photo-catalytic;adding inorganic anions（NO_3^-,SO_4^（2-）） and halogen ions（F^-,Cl^-,Br^-） into the solution can inhibite the photocatalytic effect;the inhibition of NO_3^- is greater than that of SO_4^（2-）,and the difference of halogen ion inhibition was Br^-F^-Cl^-.