采用溶胶-凝胶法制备了 TiO2、1％ La/TiO2、1％ Nd/TiO2和系列稀土 La3＋和 Nd3＋共掺杂TiO2光催化剂,进而结合水热法制备了双稀土 La3＋、Nd3＋和非金属氮共掺杂多元体系 TiO2光催化剂,并采用 XRD、UV-Vis、SEM 和 XPS 等测试手段对制备样品的微观结构、光谱学性能和离子掺杂形式进行了表征。研究表明,实验所制备样品均为锐钛矿型 TiO2光催化剂,稀土离子 La3＋或 Nd3＋的掺杂能有效抑制TiO2颗粒尺寸的生长,而且双稀土离子的共掺杂更有效抑制TiO2光催化剂颗粒尺寸的生长；非金属离子 N的掺杂,能有效拓宽 TiO2光催化剂的光响应范围；多元体系 TiO2光催化剂中,稀土钕以＋3形式掺杂,非金属氮以－3形式掺杂。实验以甲基橙为目标污染物研究其光催化性能,研究表明,所制备的光催化剂均有较高的紫外光光催化性能,其中样品1％(La∶Nd,1∶7),N/TiO2的紫外光光催化性能最高,而且有较强的可见光光催化活性。
TiO2 ,1%-La/TiO2 ,1%-Nd/TiO2 and a series of La3+and Nd3+doped TiO2 photocatalysts were pre-pared by sol-gel method.Then,sol-gel method combined with hydrothermal method synthesized multi system of rare earth La,Nd,and nitrogen-doped TiO2 photocatalysts.Their microstructure,spectroscopic properties and ion doped form were characterized by X-ray powder diffraction (XRD),UV-Vis diffuse reflectance spectros-copy techniques,scanning electron microscopy (SEM),X-ray photoelectron spectroscopy (XPS).The catalytic activity was tested for the degradation of methyl orange solution.The results showed that,all the samples which prepared in paper were Anatase TiO2 photocatalysts,the doping of La3+ or Nd3+ could hinder the growth of TiO2 particle,even,the doping of La3+ with Nd3+ together could more effective hinder the growth of TiO2 particle;Non-metallic nitrogen-doped would broaden the Light response range of TiO2 photocatalyst.At the same time,the activity results indicated that the prepared samples showed superior UV light photocatalytic ac-tivity,the sample 1%-(La∶Nd,1∶7)N/TiO2 possessed the highest UV-Vis photocatalytic activity.
参考文献
| [1] | Shi, H.;Zhang, T.;An, T.;Li, B.;Wang, X..Enhancement of photocatalytic activity of nano-scale TiO _2 particles co-doped by rare earth elements and heteropolyacids[J].Journal of Colloid and Interface Science,2012:121-127. |
| [2] | Khan M;Cao W B .Cationic(V,Y)-codoped TiO2 with enhanced visible light induced photocatalytic activity:a combined experimental and theoretical study[J].Journal of Applied Physics,2013,114:183514(1,6. |
| [3] | R.M. Mohamed;I.A. Mkhalid .The effect of rare earth dopants on the structure, surface texture and photocatalytic properties of TiO_2-SiO_2 prepared by sol-gel method[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2010(1):143-147. |
| [4] | SHI Huixian,ZHANG Tianyong,WANG Hongliang.Preparation and photocatalytic activity of La3+ and Eu3+ co-doped TiO2 nanoparticles: photo-assisted degradation of methylene blue[J].稀土学报（英文版）,2011(08):746-752. |
| [5] | Fu H B;Zhang L W;Zhang S C et al.Electron spin res-onance spin-trapping detection of radical intermediatesin in N-doped TiO2-assisted photodegradtion of 4-chlorphe-nol[J].Journal of Physical Chemistry B,2006,110(7):3061-3065. |
| [6] | Zhang Y;Yang B C;Zhou C H et al.The effect of cor-bon spheres used as template on microstructure and pho-to-electric performance of TiO2 thin film[J].Journal of Functional Materials,2012,43(19):2716-2720. |
| [7] | 吕媛,倪伶俐,杨平,曹勇.铬和硫共掺杂二氧化钛催化剂的制备及其可见光催化性能[J].催化学报,2007(11):987-992. |
| [8] | 赵斯琴,郭敏,张梅,王习东,长山.非金属元素S,N与Eu3+共掺杂纳米TiO2光催化剂的水热法制备及其性能研究[J].中国科学（化学）,2011(11):1699-1705. |
| [9] | 赵良仲,刘芬,张琳.LnCu2O4（Ln=Gd,Nd）电子结构的XPS研究[J].物理化学学报,2001(04):310-313. |
| [10] | Fu H B;Zhang L W;Zhang S C et al.Electron spin resonance spin-trapping detection of radical imtermedi-atesin N-doped TiO2-assisted photodegradation of 4-chlorophenol[J].Journal of Physical Chemistry B,2006,110(7):3061-3065. |
| [11] | 杨武,郭昊,张文皓,薛再兰,成莉燕,薄丽丽,高锦章.Pr掺杂TiO2光催化剂的制备及其对酸性品红降解反应的催化性能[J].光谱学与光谱分析,2008(04):922-925. |
| [12] | 王宜超,刘中清,燕青芝,李振华,葛昌纯.可见光响应氮掺杂TiO2光催化剂的水热法制备与性能[J].北京科技大学学报,2008(05):540-543. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%