摘要
利用酸催化的溶胶-凝胶法合成了一系列不同掺杂量的Fe3+/TiO2、Cr3+/TiO2纳米复合微粒。用XRD和TEM研究了Fe3+、Cr3+的掺杂对TiO2纳米粒子尺寸和相结构的影响。结果表明:掺杂离子不同,对TiO2纳米粒子尺寸和相结构的影响不同。在所研究的掺杂量范围内(x:0.0000~0.1000),TiO2纳米粒子的粒径随Cr3+掺杂量的增加呈减小的趋势,但幅度不大;而Fe3+的掺杂则会引起TiO2粒子的团聚和晶粒的长大;由XRD分析可知:在掺杂量范围内,不会发生Fe2O3、Cr2O3等相的偏析,但Fe3+的掺杂引起了TiO2在低温条件下由锐钛矿向金红石的相转变。通过UV-Vis光谱的研究发现:Fe3+、Cr3+的加入,可以使TiO2对光的吸收拓展到可见区,同时随着掺杂量的增加,对可见光的吸收强度显著增强。
Fe^3＋ and Cr^3＋-doped TiO2 nanoparticles with different doping amount were successfully synthesized using an acid-catalyzed sol-gel procedure. XRD, TEM, and UV-Vis techniques were used to characterizing the nanocomposites with regard to their phase, size and absorption properties. TEM showed that the average size of the particles was about 10nm. The size of Cr^3＋/TiO2 particles slightly decreased with increasing the amount of Cr^3＋ while the Fe^3＋/TiO2 particles had developed an aggregation. XRD results indicated that in the range of 0. 0000-0. 1000, Fe2O3 and Cr2O3 phases did not appear while doped Fe^3＋ lead to conversion of TiO2 from anatase to rutile. UV-Vis spectra showed a red shift and a significant increase of absorption intensity in the visible region with increasing amount of doping Fe^3＋ and Cr^3＋.
出处
《化工新型材料》
CAS
CSCD
北大核心
2006年第3期46-48,共3页
New Chemical Materials
基金
甘肃省自然科学基金项目(3ZS041-A25-034)
