| 高比表面空心球状ZnO/ZnAl2O4复合光催化剂制备及活性 | |
| Preparation and Photocatalytic Property of Hollow Sphere-Like ZnO/ZnAl2O4 Composite Photocatalysts with High Specific Surface Area | |
| 摘要: 以葡萄糖为模板，聚乙二醇(PEG-4000)为分散剂通过一步水热法所得前驱体，经500 ℃焙烧4 h得到ZnO/ZnAl2O4产物。并用XRD、SEM、TEM、BET、TG/DTA和UV-Vis DRS等技术对样品进行表征。结果表明产物为空心球状ZnO/ZnAl2O4复合光催化剂，比表面积高达158.3 m2·g-1。在模拟太阳光照射下，以甲基橙溶液的光催化降解考察样品的光催化活性，研究了焙烧温度、pH值和PEG加入量对样品光催化活性的影响。结果表明，当pH=9，PEG加入量为10%(以反应理论得到的前驱体ZnO/ZnAl2O4的质量来衡量)时，光催化活性最佳，光照60 min后，0.5 g·L-1光催化剂用量对甲基橙的脱色率达98.7%，与TiO2 Degussa P-25进行比较，相同条件下对甲基橙的脱色率提高了7.7%。 | |
| 关键词: ZnO/ZnAl2O4 水热法 比表面 光催化 | |
| 基金项目: | |
| Abstract: ZnO/ZnAl2O4 composite photocatlysts were prepared via one-pot hydrothermal process by using glucose as template and polyethylene glycol (PEG-4000) as dispersion agent after calcination at 500 ℃ for 4 h. The as-prepared samples were characterized by XRD, SEM, TEM, BET, TG/DT and UV-Vis DRS. The results indicated that the prepared ZnO/ZnAl2O4 composite photocatalyst showed hollow microspheres shape with high specific surface area. The photocatalytic activities of the as-obtained samples were evaluated by the degradation of Methyl Orange (MO) in aqueous solution under simulated sunlight irradiation. The effects of calcination temperature, pH value and amount of PEG on the photocatalytic degradation efficiency of MO were investigated. The results showed that the highest photocatalytic degradation efficiency was observed at 10wt.% mass ratio of PEG to ZnO/ZnAl2O4 and pH value of 9 in the starting materials. The maximum photocatalytic decoloration rate of MO was 98.7% within 60 min at 0.5 g·L-1 concentration of photocatlyst, which increased by 7.7% compared to that of TiO2 Degussa P-25 under the same conditions. | |
| Keywords: ZnO/ZnAl2O4 hydrothermal process specific surface area photocatalysis | |
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| 张 丽,阎建辉,周民杰,杨亚辉,刘又年.高比表面空心球状ZnO/ZnAl2O4复合光催化剂制备及活性[J].无机化学学报,2012,28(9):1827-1834. | |
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