摘要
以TiCl4和镧系元素的氯化盐溶液为前驱体,采用溶胶-凝胶法制备了不同含量镧系离子掺杂的TiO2光催化剂,用X射线衍射(XRD)、光致发光光谱(PLS)、表面光电压谱(SPS)和X射线光电子能谱(XPS)对催化剂进行了表征.XRD结果表明,样品为锐钛矿和金红石的混晶相,镧系离子未进入到TiO2晶格中.PLS和SPS测定结果表明,随着掺杂离子的不同和掺杂含量的不同,样品的谱强度呈现有规律的变化.在紫外光照射下,以咪唑为目标降解物比较了催化剂的光催化活性.结果表明,适当含量的镧系离子掺杂可有效促进TiO2表面光生载流子的分离,从而显著提高其光催化活性.
The lanthanide ions doped TiO2 samples with different content were prepared by the sol-gel method using titanium tetraehloride and lanthanide chloride as the raw materials. The samples were characterized by X-ray diffraction （XRD）, photolumineseenee spectroscopy （ PLS）, surface photovoltage spectroscopy （ SPS）, and X-ray photoelectron spectroscopy （XPS）. The XRD result indicated that the lanthanide ions did not enter the crystal lattices of TiO2. The intensity of PLS and SPS related to the surface oxygen vacancies and defects as well as the separation and recombination of photoindueed charge carriers changed with the kinds of lanthanide ions and the dopant content. The photocatalytie activity of the samples for the degradation of aqueous irnidazole was tested under UV light. The result showed that the appropriate content of lanthanide dopants could effectively promote the separation effect of surface photoindueed charge carriers on TiO2, which was responsible for the remarkable inerease in photocatalytie activity.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2006年第4期344-348,共5页
基金
教育部留学回国人员科研启动基金资助项目(2003-406)
关键词
镧系离子
二氧化钛
溶胶-凝胶法
咪唑
光催化
降解
lanthanide ion
titania
sol-gel method
irnidazole
photocatalysis
degradation
