| 上转换发光剂掺杂纳米TiO2的制备及可见光降解乙基紫的研究 |
| 摘要点击 1536 全文点击 1093 投稿时间：2005-07-26 修订日期：2005-09-09 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 上转换发光剂 掺杂纳米TiO2 光降解 可见光 乙基紫 |
| 英文关键词 upconversion luminescence agent doped nanometer TiO2 photocatalytic degradation visible light ethyl violet |
|
| 中文摘要 |
| 合成了一种新型含有稀土金属Er的上转换发光剂40CdF2·60BaF2·1.6Er2O3,此上转换发光剂在488 nm可见光的激发下,产生了5个波长均小于387 nm的上转换紫外光发射峰.采用超声波分散的方法制备出了上转换发光剂掺杂的纳米TiO2可见光光催化剂.利用X-射线衍射(XRD)及透射电镜(TEM)对催化剂进行了表征.以乙基紫染料为研究对象,研究了在(三基色灯下发出的)可见光的照射下该可见光光催化剂的催化降解性能,并与未掺杂的纳米TiO2粉末的催化性能进行了对比.结果表明,作为掺杂成分的上转换发光剂可有效地将可见光转化为紫外光并被纳米TiO2粉末吸收利用,在可见光照射12.0 h后乙基紫降解率达到了99.68%,大大高于未掺杂纳米TiO2时的降解率. |
| 英文摘要 |
| A novel upconversion luminescence agent 40CdF2·60BaF2·1.6Er2O2 was synthesized and the fluorescent spectrum was determined.This upconversion luminescence agent can emit five upconversion fluorescent peaks whose wavelengths are all below 387nm under the excitation of 488 nm visible light.This upconversion luminescence agent was mixed into nanometer TiO2 powder by ultrasonic dispersion and the doped nanometer TiO2 photocatalyst utilizing visible light was prepared.The doped TiO2 powder was charactered by XRD and TEM and its photocatalytic activity was checked through the photocatalytic degradation of ethyl violet dye as a model compound under the visible light irradiation emitted by three basic color lamp.Otherwise,in order to compare the photocatalytic activities the same experiment was carried out for undoped photocatalytic TiO2 powder.The degradation ratio of ethyl violet dye in the presence of doped nanometer TiO2 powder reached 99.68% under visible light irradiation at 12.0 h which was obviously higher than the corresponding degradation ratio in the presence of undoped nanometer TiO2 powder,which indicate that the upconversion luminescence agent prepared as dopant can effectively turn visible lights to ultraviolet lights which are absorbed by nanometer TiO2 particles and produce the electron-cavity pairs. |
