磁场辅助对掺杂TiO_2薄膜光催化活性的影响  

Effect of permanent magnetic field on photo-catalytic activity of doped TiO_2 films

作　　者：尹荔松[1] 范海陆[1] 周克省[1] 陈永平[1] 谭敏[1] 

机构地区：[1]中南大学物理科学与技术学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2008年第6期1175-1180,共6页Journal of Central South University:Science and Technology

基　　金：中国博士后基金资助项目(20060390878);湖南省博士后基金资助项目(2007RS4024)

摘　　要：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,通过实验探讨外加磁场对Fe3+和La3+掺杂TiO2薄膜光催化活性的影响。研究结果表明:外加磁场使掺杂Fe3+/TiO2薄膜的光催化活性降低,在磁感应强度为7mT时,催化剂几乎完全失活,光催化降解率低于2.0%;而对于掺杂1.0%La3+/TiO2薄膜,在磁感应强度为30mT时,光催化降解率达47.4%,比无外加磁场时高12%;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。Effects of magnetic field on photo-catalytic degradation of azocarrnine B with Fe^3＋ or La^3＋ doped TiO2 films were investigated. The results indicate that the photo-catalytic activity of Fe^3＋/TiO2 films is deactivation and the activity of La^3＋/TiO2 films is reactivation in magnetic field. The degradation rate of Fe^3＋/TiO2 films is less than 2.0% at 7 mT of magnetic induction. The degradation rate of doped La^3＋/TiO2 （1.0%） film achieves 47.4% at 30 mT of magnetic induction, which is more than 12% compared with that without applied magnetic field. 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.

关 键 词：TIO2 光催化 磁场 掺杂 

分 类 号：O643.3[理学—物理化学]