外加磁场对掺杂TiO_2薄膜光催化活性的影响

Effect of Permanent Magnetic Field on the Photo-catalytic Activity of Doped TiO_2 Films

利用外加匀强磁场辅助掺杂TiO2光催化降解偶氮胭脂红B溶液,实验探讨了外加磁场强度对Fe3+、Ni2+、Cu2+掺杂TiO2薄膜光催化活性的影响。结果表明:外加磁场使掺杂Ni2+/TiO2、Fe3+/TiO2薄膜的光催化活性降低,在磁感应强度为0.7×10-2T时,催化剂Fe3+/TiO2几乎完全失活,光催化降解率低于2.0%,而掺杂0.5%Cu2+/TiO2薄膜的光催化活性在磁场辅助下光催化活性普遍增强,感应强度为1.0×10-2T时光催化降解率达19.4%,相当于无外加磁场时的1.2倍;理论分析指出,磁场辅助对掺杂TiO2光催化活性的影响与掺杂离子的磁导率有关。

The effects of magnetic field on photo-catalytic degradation of Azocarmine B with Ni^2＋ ,Fe^3＋ ,Cu^2＋ doped TiO2 films were investigated. The results indicate that the photo-catalytic activity of Fe^3＋/TiO2 , Ni^2＋/TiO2 films are deactivation and the activity of Cu^2＋/TiO2 films are reactivation under magnetic field. The degradation rate of Fe^3＋/TiO2 films less than 2. 0 % under 0. 7 × 10^-2 T magnetic induction. The degradation rate of doped Ca^2＋/TiO2 （0. 5% ） film achieves 19. 4% under 1.0 × 10^-2 T magnetic induction,which is 1.2 times compared with that without applied magnetic field. Theoretical analysis indicates that the effect of permanent magnetic field on the photo-catalytic activity of doped TiO2 films is determined by the doping ion＇s magnetic permeability and the magnetic intensity.