Fe^(3+)-TiO_2薄膜经不同温度退火后的可见光催化性能  

Visible Light Photocatalytic Property of Fe^(3+)-TiO_2 Thin Films after Annealing at Different Temperatures

作　　者：白爱英[1,2] 梁伟[1] 云洁[1] 薛晋波[1] 

机构地区：[1]太原理工大学材料科学与工程学院,太原030024 [2]忻州职业技术学院机电工程系,忻州034000

出　　处：《材料导报》2010年第8期8-11,共4页Materials Reports

基　　金：山西省归国留学基金(2007-25);山西省重点实验室开放基金(2008012013-7);太原市2009年大学生创新创业专项项目(09122018)

摘　　要：采用溶胶-凝胶法制备了掺杂Fe3+的TiO2薄膜,并在不同温度热处理。用SEM、XPS、UV-vis等分析方法进行结构表征和性能测试,通过降解亚甲基蓝溶液测试其可见光光催化活性。结果表明,723K时掺杂Fe3+的TiO2薄膜已经结晶,粒径为40～50nm。掺杂元素以Fe3+和Fe2+形式存在于TiO2晶格并取代Ti4+形成Ti-O-Fe键,改变了TiO2的表面态,使TiO2带隙变窄,促进了对可见光的吸收。降解实验结果表明,823K热处理后掺杂铁的TiO2薄膜其光催化活性最好,在25W白炽灯模拟可见光下照射3.0h后,亚甲基蓝溶液的降解率接近30%。Fe3＋-doped TiO2 thin films are prepared by sol-gel technology, and annealed at various tempera tures. The effects of anneal temperatures on the size of grain, morphology and optical properties are tentatively discussed. Scanning electron microscopy （SEM）, X-ray photoelectron spectroscopy （XPS） and UV-vis absorption spectra （UV-vis） are employed to characterize the samples. Photo-catalytic activity of the films was evaluated by measuring the decomposition rate of methylene blue （MB） solution. Studies show that doped Fe3 ＋ TiO2 films are crystallized at 723K, the grain diameter is about 40nrn to 50nrn. Doped Fe exists on TiO2 films as Fe3＋ and Fe2＋ , which can re- place Ti4＋ to form Ti-O-Fe bonds, results in the band-gap narrowing and the visible absorption enhancing. The degra- dation experiments indicate that the maximal photc-catalytie activity was obtained at 823K. The decomposition rate of methylene blue （MB） solution is close up 30% when 25W incandescent lamp irradiation for 3. Oh.

关 键 词：掺杂Fe3+ 薄膜 热处理 可见光催化活性 

分 类 号：O484[理学—固体物理]