Mo掺杂对纳米TiO_2结构和活性的影响  

Influence of Mo Doping on Structure and Activity of Nanosized TiO_2

作　　者：王玉萍[1,2] 王连军[1] 袁俊秀[3] 彭盘英[3] 陆天虹[3] 

机构地区：[1]南京理工大学化工学院,南京210094 [2]南京师范大学化学与环境科学学院 南京 [3]南京师范大学化学与环境科学学院

出　　处：《应用化学》2007年第1期53-57,共5页Chinese Journal of Applied Chemistry

基　　金：教育部"211"工程建设项目;江苏省高校自然科学研究指导项目(05KJD6010110)资助

摘　　要：利用Mo6+的掺杂在TiO2中引入缺陷,从而扩大TiO2催化剂的光谱响应范围。运用UV-Vis、XRD、XPS、TG-DTA等测试技术考察了钼离子掺杂浓度对于TiO2光催化剂吸收光谱范围、晶型、晶胞和晶粒的影响,分析了钼进入TiO2品格的方式、价态和掺杂催化剂在热处理过程中发生的物理和化学变化。以亚甲蓝溶液的光催化降解为模型反应,考察了掺杂量对这种新型光催化剂的光催化活性的影响。结果表明,Mo6+可进入TiO2晶格中形成杂质缺陷,引起TiO2品格膨胀,Mo6+的掺杂量影响TiO2晶粒尺寸和晶相转化。Mo6+掺杂的质量分数为4．5％时,样品的吸收带边可达460 nm,对40 mg/L亚甲蓝反应2 h的降解率为58．3％,矿化率为52．5%。而Mo6+的掺杂质量分数为3．0％和6．0％时,形成的TiO2晶粒尺寸较小,TiO2晶粒中锐钛矿相与金红石相的比例接近4:1时,对亚甲蓝降解率分别为56．6％和52．0％,矿化率分别为49．2％和44．2％。The visible-light responding region was extended by Mo^6 ＋ doping because the doping of Mo^6 ＋ could introduce crystal cavities into TiO2 nanoparticles and reduce its energy band gap. Effects of doping concentration on visible-light responding region, crystal phase, grain size and cell parameters of TiO2 catalyzer were studied by means of UV-Vis, XRD, XPS and TG-DTA techniques, at the same time, the style of doping, valence state of doped ions and the physical and chemical reaction in the course of heating were also studied. The photocatalytic activity was evaluated by the photodegradation of methylene blue under visible-light radia- tion. It was found that the visible-light responding region and the photocatalytic activity of nanosized TiO2 were affected by the doping amount. The UV-Visible absorption band of 4. 5% Mo doped TiO2 reached to about 460 nm, the removal efficiency of methylene blue was 58.3% , and TOC was 52. 5%. For nano TiO2 with 3.0% and 6.0% Mo doping, the removal of methylene blue were 56. 6% and 52. 0%, and TOC were 49. 2% and 44. 2%, and both of them had a ratio of 4：1 of anatase to rutile and smaller grain size.

关 键 词：Mo掺杂 掺杂量 可见光 光催化 

分 类 号：O643[理学—物理化学]