利用溶胶-凝胶法制备了不同掺杂量及不同温度焙烧的Tm掺杂TiO2纳米粉体.采用X射线衍射(XRD),紫外-可见漫反射谱(DRS)和光致发光光谱(PL)技术研究了Tm掺杂量和焙烧温度对其相结构、晶粒尺寸、光吸收及光致发光性能的影响;并以亚甲基蓝(MB)溶液的光催化降解评价其光活性.结果表明:低量Tm掺杂强烈抑制TiO2由锐钛矿相向金红石相转变,减小晶粒尺寸;然而,Tm掺杂量增加,抑制相变作用减弱.Tm掺杂导致样品的紫外吸收能力略有降低,光吸收带边蓝移.Tm掺杂导致样品的PL谱强度降低(0.05%<0.075%<0.025%≈0.1%<0%).光活性升高(0.075%>0.05%>0.1%>0.025%>0%),但二者顺序并不完全一致.低量Tm掺杂能有效提高纳米TiO2的光活性;当Tm掺杂量为0.075%(质量分数)、焙烧温度为550℃时,制得样品呈双相结构,锐钛矿相占91%,晶粒尺寸为24.48 nm,其光活性最佳.光活性提高的主要根源是Tm掺杂能有效促进纳米TiO2表面光生e-/h+分离,提高量子化效率.
参考文献
| [1] | Kazumoto Nishijima;Takayuki Fukahori;Naoya Murakami .Development of a titania nanotube (TNT) loaded site-selectively with Pt nanoparticles and their photocatalytic activities[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2008(1):105-109. |
| [2] | F. Magalhaes;R.M. Lago .Floating photocatalysts based on TiO_2 grafted on expanded polystyrene beads for the solar degradation of dyes[J].Solar Energy,2009(9):1611-1618. |
| [3] | Su YL;Zhang XW;Zhou MH;Han S;Lei LC .Preparation of high efficient photoelectrode of N-F-codoped TiO2 nanotubes[J].Journal of Photochemistry and Photobiology, A. Chemistry,2008(2/3):152-160. |
| [4] | Shi W J;Zheng T J;Hu Y J;Zhao C Y .Influence of Fe3+ and Ho3+ co-doping on the photocatalytic activity of TiO2[J].Materials Chemistry and Physics,2007,106(2-3):247. |
| [5] | 黄翠英,由万胜,党利琴,雷志斌,孙振刚,张澜萃.钕掺杂对纳米TiO2光催化分解水制氢活性的影响[J].催化学报,2006(03):203-209. |
| [6] | 张华星,张玉红,徐永熙,王彦广.铽（Ⅲ）掺杂TiO2纳米材料相转移和光催化性质研究[J].化学学报,2003(11):1813-1818. |
| [7] | 姜洪泉,王鹏,卢丹丹,吴兰英.Gd3+掺杂TiO2纳米粉体的晶粒尺寸、表面特性和光催化活性[J].化工学报,2006(09):2194-2200. |
| [8] | 卢维奇,王德清,何肖群,赵黎明.钆及双稀土元素掺杂TiO2可见光催化降解罗丹明B的研究[J].中国稀土学报,2007(04):427-431. |
| [9] | 蔡河山,刘国光,吕文英,余林,李大光.钬掺杂提高TiO2纳米晶光催化活性的光谱性能机制研究[J].中国稀土学报,2007(01):16-21. |
| [10] | 周艺,黄可龙,朱志平,杨波,夏畅斌,肖汉宁.酸催化溶胶-凝胶法Eu2+、Gd3+共掺杂TiO2的制备及光催化活性[J].无机材料学报,2008(05):1085-1088. |
| [11] | 姜洪泉,王鹏,线恒泽.低量Yb3+掺杂的TiO2复合纳米粉体的制备及光催化活性[J].化学学报,2006(02):145-150. |
| [12] | Jing LQ;Qu YC;Wang BQ;Li SD;Jiang BJ;Yang LB;Fu W;Fu HG;Sun JZ .Review of photoluminescence performance of nano-sized semiconductor materials and its relationships with photocatalytic activity[J].Solar Energy Materials and Solar Cells: An International Journal Devoted to Photovoltaic, Photothermal, and Photochemical Solar Energy Conversion,2006(12):1773-1787. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%