不同制备pH值对纳米Co_3O_4光催化脱色性能的影响

采用并流沉淀法在不同pH值下制备了纳米Co3O4,用X-射线衍射(XRD)、比表面(BET)、扫描电镜(SEM)和热重-差热(TG-DTA)对所制备的材料进行了表征。以甲基橙为模拟污染物,考察了纳米Co3O4光催化脱色性能。实验结果表明:不同制备pH值对Co3O4表面参数,形貌,晶粒大小、热分解行为及光催化脱色性能影响显著。pH控制在8.5左右时所制备纳米Co3O4具有最高的比表面、最低的孔径、最小的粒径和最好的光催化活性,光照1小时对甲基橙溶液的脱色率达到40%。

Fabrication and Photocatalytic Performance of Co_3O_4 Prepared under Different pH Using Paralled Flaw Precipitation Method

The photocatalysts,nano-structured Co3O4 were prepared via the paralled precipitation method under different pH value and characterized by BET,XRD,SEM and TG-DTA.The photocatalytic activity was evaluated by decolorization of 100 mL methyl orange solution（10 mgL-1） under identical conditions.The results show that the pH value can influence greatly the surface parameters,SEM image,the particle size,thermal decomposition process and the photocatalytic performance.The results show that Co3O4 prepared possesses the highest BET surface area,photocatalytic activity,the smallest pore size and the particle average size when pH is 8.5.Photocatalytic decolorization efficiency of methyl orange solution over Co3O4 prepared under pH=8.5 is 40% in one hour.