Effect of TiO2 Doping by Zn on Crystalline Phase and Photocatalytic Activity
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摘要: 采用改进的溶胶- 凝胶法制备ZnO- TiO2复合催化剂, 通过X射线衍射(XRD)、 紫外- 可见漫反射(UV- Vis DRS)对其微晶结构和光吸收性能进行表征. 以甲基橙作为模拟降解物, 结果表明, 改变水和乙醇的含量以控制溶胶向凝胶陈化的时间影响ZnO- TiO2的催化活性. 当 n(Zn)∶ n(Ti) 为 3∶ 15、 煅烧温度为 500 ℃时产物催化效率最好, 紫外光照 5h, 降解率为96.4%. XRD 结果显示, ZnO- TiO2主要以锐钛矿相 和立方Zn2TiO4晶相存在, 且Zn2TiO4晶相在 n(Zn)∶ n(Ti)≥3∶ 15时才会出现. 紫外- 可见漫反射吸收光谱示, 相比单纯TiO2, ZnO- TiO2吸收边蓝移.Abstract: ZnO- TiO2 composite catalyst was prepared by modified sol-gel method. The microcrystalline structure and light absorption performance of ZnO- TiO2 were identified by XRD and UV-Vis DRS, respectively. With methyl orange(MO) as the degradation product, the result showed that the photocatalytic activity of ZnO- TiO2 was affected by the conversion time from sol to gel controlled by changing the content of water and ethanol. when the ratio of n(Zn)∶n(Ti) was 3∶15 and calcination temperature was 500 ℃, the degradation of MO was up to 96.4% under UV irradiation for 5 h. The XRD results confirmed ZnO- TiO2 appeared mostly anatase TiO2 and cubic Zn2TiO4 phases, and the cubic Zn2TiO4 phase was observed only when n(Zn)∶n(Ti)≥3∶15. Compared with the pure TiO2, the characteristic absorption threshold of ZnO- TiO2 appeared slight blue shift
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Keywords:
- ZnO/GO /
- Zn2TiO4 /
- sol-gel method /
- photocatalytic
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[1] 杨国强. 我国光化学研究的进展及展望[ J] . 化学通报, 2011, 74(7):594- 599. [2] 鲁飞, 孟凡明. TiO 2 光催化剂掺杂改性研究进展[ J]. 硅酸盐通报, 2011, 30(1):116- 119, 124. -
期刊类型引用(1)
1. 马志强,陈纪文. ZnO-TiO_2复合光催化剂降解坝上地区污水中有机化合物性能的研究. 辽宁化工. 2024(06): 935-937+942 . 百度学术
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