多元掺杂负载型TiO_2光催化剂的制备与性能

为了提高TiO2光催化剂日光催化性能及解决催化剂回收问题,采用微乳液法制备了La3＋、Fe3＋、Co2＋、Ce4＋共掺杂TiO2/粉煤灰微珠光催化剂,用紫外-可见分光光度计测定了光催化剂的可见光吸收性能,用能谱仪（EDS）分析了催化剂的元素含量,以甲基橙为模型污染物考察了催化剂的光催化性能。实验结果表明：掺杂复合粒子在可见光区吸光性能均高于TiO2/漂珠;且多元素掺杂有协同作用,催化剂的吸收边带红移更多,对可见光的吸收也更强。日光照射下（Co2＋,Fe3＋,Ce4＋）三元共掺杂催化剂的活性≈（La3＋,Ce4＋）二元共掺杂催化剂的活性〉Fe3＋、La3＋单掺杂催化剂的活性。

Study of Preparation and Performance of carried co -doped TiO2 Photocatalyst

Co- doped TiO2/cenosphere photoeatalysts with La3＋ , Fe3＋ , Co2＋ , Ce4＋ were prepared by microe- mulsion method. The visible light absorption performances of the co - doped TiO2/cenosphere photocatalysts were investigated by UV - visible spectrophotometer. The content of the finite element of catalysts were analyzed by EDS. The catalytic activity of the photocatalyst was studied with methyl orange as model pollution. The results show that in visible light range the absorption ability of the doped composite particles was better than TiO2/ceno- sphere. Multi - doping for TiO2/cenosphere has synergism effect. Co - doping makes the red - shift of the ab- sorbing band more and the absorption ability for visible light greater. The sunlight photocatalytic activity of the （Co2＋,Fe3＋,Ce4＋）- TiO2/cenosphere ≈（La3＋,Ce4＋）-TiO2/cenosphere 〉 La3 ＋ （ or Fe3＋） - TiO2/ceno- sphere.