Ag掺杂Sm_2O_3/TiO_2对甲基橙光降解性能的影响

Effect of Ag-doped Sm_2O_3/TiO_2 on the Photodegradation Performance of Methyl Orange

采用光沉积法制备Ag掺杂的光催化剂Ag-Sm_2O_3/TiO_2,并对其在紫外光区对甲基橙的光降解行为进行了研究。采用XRD、FT-IR、N2吸附、SEM、TEM和XPS等手段对样品Ag-Sm_2O_3/TiO_2进行了表征,考察了Sm_2O_3和Ag掺杂量对甲基橙紫外光降解活性的影响和催化剂Ag-Sm_2O_3/TiO_2的催化稳定性。结果表明,Sm_2O_3/TiO_2在紫外光照射下对甲基橙的光降解活性随着Sm_2O_3的增大而减小;与样品Sm_2O_3/TiO_2相比,催化剂Ag-Sm_2O_3/TiO_2对甲基橙具有更好的紫外光降解活性,其催化活性随着Ag掺杂量的增加而减小。Ag和Sm_2O_3掺杂量均为3.0wt%的催化剂Ag(3)-Sm_2O_3(3)/TiO_2对甲基橙紫外光降解的活性最高,在相同条件下的6次循环实验未出现明显失活。

The Ag-doped Ag-Sm203/TiO2 photocatalyst was synthesized using a photodeposition route, and performed for the UV-light driven photodegradation of methyl orange. The obtained Ag-Sm203/TiO2 samples were characterized by several techniques such as XRD, FT-IR, N2-sorption, SEM, TEM, and XPS. The effects of the doping contents of Sm203 and Ag on the photodegradation activity in methyl orange as well as photocatalytic stability were also performed. The results suggest that the photoeatalytic activity of SmzO3/TiO2 for the degradation of methyl orange under UV-light irradiation decrease with the increase of Sm203 content. Compared with Sm203/Ti02 bulks, Ag-Sm203/TiO2 exhibit superior photoeatalytic activity for the degradation of methyl orange. The photodegradation activity of the as- prepared sample decreases with the increase of the amount of Ag doping. Ag-Sm203/TiO2 with Ag content of 3.0 wt% and Sm203 content of 3.0wt% show the best photocatalytic activity, and did not seriously deactivate for the degradation of methyl orange after six cycles testing under the same experimental conditions.