摘要
通过溶胶-凝胶(Sol-Gel)法制备了铁、镧共掺杂纳米TiO2,采用X线衍射仪(XRD)、X线光电子能谱(XPS)、紫外-可见分光光度计(UV-Vis)和荧光分光光度计(FL)等测试手段对样品进行表征。结果表明,500℃煅烧后的掺杂TiO2均呈锐钛矿型,平均粒径为6.1nm,掺杂抑制了TiO2粒径的长大,掺杂的Fe3+、La3+能有效进入TiO2晶格。掺杂使TiO2的吸收带边红移且在可见光区的光吸收增强,样品的荧光强度越小,催化效果越好。可见光光催化降解甲基橙实验结果表明,可见光照射5h,最佳共掺杂的0.01%Fe/0.6%La-TiO2对甲基橙的降解率达40.7%。
The Fe and La co-doped nano-TiO2 has been prepared by Sol-Gel method.The sample was characterized by X-ray diffractometer（XRD）,X-ray photoelectron spectroscopy（XPS）,ultraviolet-visible（UV-Vis）spectrophotometer and fluorescence spectrophotometer（FL）.The results show that all the samples present the anatase structure and the average size of the nano-TiO2 is about 6.1 nm after calcining at 500 ℃,the doping restrained the increase of grain size,the doped Fe3＋ and La3＋ can enter into effectively the TiO2 crystal lattice and make the absorption profile of TiO2 red-shift and increased the absorbance in visible light region.The less the fluorescence intensity of the sample was,the better the catalytic effect.The visible photocatalytic property of titania nanocrystalline grains was evaluated by the methyl orange decomposition.The results show that the optimized Fe and La co-doped amount is approximately 0.01%Fe/0.6%La-TiO2,The degradation rate is 40.7% after a light exposure for 5 h.
出处
《压电与声光》
CSCD
北大核心
2012年第2期283-287,共5页
Piezoelectrics & Acoustooptics
基金
重庆市重点自然基金资助项目(CSTC
2008BA4012)
重庆市科技攻关基金资助项目(CSTC
2009AC4066)
