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Zn掺杂对 TiO2晶相及光催化性能的影响

Effect of TiO2 Doping by Zn on Crystalline Phase and Photocatalytic Activity

    摘要
  • 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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