摘要
研究了用一步水热法制备的不同形貌的钛酸铋(Bi_4Ti_3O_(12),BIT)粒子的光学和可见光催化性能,并对其晶体结构和微观结构用X射线衍射(XRD)、场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)和高分辨透射电子显微镜(HRTEM)等手段进行了表征.XRD结果表明,所制备的BIT样品为层状钙钛矿结构.FESEM结果表明,通过控制水热过程的反应参数可以得到不同形貌的纳米粒子.紫外-可见漫反射光谱(UV-Vis DRS)表明BIT样品的带隙能约为2.88-2.93 eV利用可见光(λ>420 nm)照射下的甲基橙(MO)降解实验评价了BIT样品的光催化性能.结果表明,BIT的光催化活性比掺氮TiO_2(N-TiO_2)高得多.研究了形貌对BIT光催化性能的影响.所制备的BIT纳米带光催化效率最高,经可见光照射360 min,甲基橙溶液的降解率可达到95.0%.
Bismuth titanate （Bi4Ti3O12, BIT） particles with different morphologies were synthesized by a one-step hydrothermal process and their optical and photocatalytic properties were investigated. The crystal structure and microstructures were characterized using X-ray diffraction （XRD）, field emission scanning electron microscopy （FESEM）, transmission electron microscopy （TEM）, and high-resolution transmission electron microscopy （HRTEM）. XRD patterns demonstrate that the as-prepared BIT samples have layered perovskite structure. FESEM shows that BIT crystals can be fabricated in different morphologies by simply manipulating the reaction parameters of the hydrothermal process. The UV-visible diffuse reflectance spectra （UV-Vis DRS） reveal that the band gaps of the BIT photocatalysts are about 2.88-2.93 eV. The as-prepared BIT photocatalysts exhibit higher photocatalytic activities toward the degradation of methyl orange （MO） under visible light irradiation （A〉420 nm） when compared with traditional N-doped TiO2 （N-TiO2）. The influence of morphology on the photocatalytic properties of BIT was also studied. BIT nanobelt structures displayed the highest photocatalytic activity. Up to 95.0% MO was decolorized after visible light irradiation for 360 min.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2013年第2期411-417,共7页
Acta Physico-Chimica Sinica
基金
supported by the Key Laboratory of Preparation and Application of Environmentally Friendly Materials of the Ministry of Educationof China
Doctoral Scientific Research Project of Jilin Normal University,China~~
关键词
钛酸铋
纳米球
纳米片
纳米带
可控合成
光催化降解
Bi4Ti3O12
Nanosphere
Nanoplate
Nanobelt
Controllable synthesis
Photocatalyticdegradation
