摘要
以钛酸四丁酯为钛源,FeC2O4·2H2O为铁源,离子液体([C4MIM]BF4)为模板剂采用溶胶凝胶法制备了具有大比表面积及可见光活性的Fe掺杂介孔TiO2光催化材料。采用X射线衍射仪、氮气吸附-脱附仪、透射电子显微镜、紫外可见吸收光谱对样品进行表征。结果表明所制备样品IL-Fe/TiO2中TiO2主要以锐钛矿相存在,Fe掺杂量对TiO2晶相影响不大,样品IL-0.1%Fe/TiO2具有介孔结构和较大的比表面积,颗粒尺寸在30 nm左右。紫外可见光谱分析表明铁掺杂后TiO2的吸收带红移,带隙能降低。以亚甲基蓝为模拟污染物,在可见光(λ>420 nm)下测定样品光催化活性,结果表明IL-0.1%Fe/TiO2的可见光催化活性最高。
Fe-doped mesoporous TiO2 photocatalysts, with large specific surface area, stable crystal structure and visible-light activity, were prepared by an ionic liquid （ [ C4MIM ] BF4 ） modified sol-gel method using tetrabutyl titanate and FeC204 ~ 2H20 as the Ti and Fe precursors, respectively. The prepared samples were characterized by X-ray diffraction （XRD）, Brunauer-Emmett-Teller （BET） analysis, transmission electron microscopy （ TEM）, and Ultraviolet-visible absorption spectroscopy （ UV- Vis）, respectively. The results showed that the TiO2 in IL-Fe/TiO2 samples was mainly anatase, and the doping concentration of Fe had little effect on the crystalline phase of TiO2. IL-O. 1% Fe/TiO2 showed mesoporous structure and large specific surface area, and the particle size was about 30 nm. UV-visible spectra indicated that red shift of the absorbtion band of Fe-doped TiO2 was observed, and the energy band gap was reduced. Photocatalytic activity of the Fe/TiO2 mesoporous photocatalysts was evaluated by photodegradation of methylene blue （MB） under visible light （A 〉 420 nm）, and IL-0. 1% Fe/TiO2 exhibited the highest photocatalytic activity.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2014年第1期139-143,共5页
Bulletin of the Chinese Ceramic Society
基金
辽宁省高等学校优秀科技人才支持计划(LR2012042)
辽宁省大学生创新创业训练计划项目(201311258023)
大连大学"大创计划"项目(2012080)
