Fe^3＋掺杂TiO2光催化纤维材料的制备及表征  

Preparation and Characterization of Fe^(3+)-Doped TiO_2 Photocatalytic Fiber Materials

作　　者：苏碧桃[1] 孙佳星[1] 胡常林[1] 张小红[1] 费鹏[1] 雷自强[1] 

机构地区：[1]西北师范大学化学工学院,省部共建生态环境相关高分子材料教育部重点实验室,甘肃省高分子材料重点实验室,兰州730070

出　　处：《物理化学学报》2009年第8期1561-1566,共6页Acta Physico-Chimica Sinica

基　　金：甘肃省自然科学基金(0710RJZA119)资助项目~~

摘　　要：以棉花纤维为模板制备了一系列Fe3+掺杂的、具有中空纤维结构的TiO2光催化材料(Fe3+/TiO2),利用热重分析(TG)、扫描电子显微镜(SEM)、X射线衍射(XRD)、zeta电位、红外光谱(IR)和紫外-可见光谱(UV-Vis)等技术对其形貌、晶体结构及表面结构、光吸收特性等进行了表征.以亚甲基蓝(MB)溶液的脱色降解为模型反应,考察了不同Fe3+掺杂量的样品在太阳光下的光催化性能.结果表明,用模板法制备的Fe3+/TiO2中空纤维结构材料表面存在大量纳米微粒(平均尺寸约12nm);Fe3+可能均匀分散于锐钛矿结构的TiO2中,部分取代Ti4+的晶格位置,既拓宽了TiO2的光谱响应范围,又形成了TiO2晶体结构的缺陷,使其表面带负电荷.在太阳光条件下,该纤维结构材料较纯TiO2对MB溶液具有更好的光催化脱色降解效果,且Fe3+的掺入量显著影响该纤维材料的催化性能;当Fe3+掺杂量为0.15%(w),在500℃焙烧2h所得中空纤维材料的催化性能最好,2h即可使MB溶液的脱色降解率达93%;重复使用5次仍可使MB溶液的脱色降解率保持在90%以上,且该催化剂材料易于离心分离去除.因此,以该模板合成法,通过Fe3+的掺杂有望使TiO2成为一种低或无能耗、高活性的绿色环保型催化材料.A series of Fe^3＋doped TiO2 photocatalytic materials （Fe^3＋/TiO2） with a hollow fiber structure were successfully prepared using cotton fiber as the template. Thermo-gravimetric （TG）, scanning electron microscopy （SEM）, X-ray diffraction （XRD）, zeta potential, infrared spectroscopy （IR）, and UV-visible spectroscopy （UV-Vis） were employed to characterize the morphology, crystal structure, surface structure, and optical absorption properties of the samples. Using the degradation of methylene blue （MB） as a model reaction, the photocatalyfic properties of the samples with different amounts of Fe^3＋ -doped were investigated. Results showed that a large number of nanosized particles existed on the surface of the fiber materials with hollow structures, indicating that these materials had a large specific surface area. Fe^3＋ ions were possibly well distributed in the lattice structure of anatase TiO2 and partially replaced Ti^4＋ which caused a broadening of the spectral response of TiO2 and also caused defects in the crystal structure. The fiber structure material showed better photocatalytic properties for the degradation of MB than pure TiO2 under solar light and the amount of Fe^3＋ -doped significantly affected the catalytic property. On the surface of the fiber material with 0.15% （w） of Fe^3＋ -doped, the decolorizing efficiency of the MB solution reached 93% at radiation time of 2 h and remained above 90% upon repetition （5 times）. The material was easily removed by centrifugal separation. Therefore, using the template method and by doping with Fe^3＋, TiO2 may hopefully become a low- or non-energy consuming, high activity and green environmentally friendly catalytic material.

关 键 词：光催化 TIO2 Fe3+掺杂 棉花纤维 模板法 制备 表征 

分 类 号：O643.3[理学—物理化学]