CAJ | 학술논문

研究了用一步水热法制备的不同形貌的钛酸铋(Bi4Ti3O12, 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TiO2(N-TiO2)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%.
연구료용일보수열법제비적불동형모적태산필(Bi4Ti3O12, BIT)입자적광학화가견광최화성능,병대기정체결구화미관결구용X사선연사(XRD)、장발사소묘전자현미경(FESEM)、투사전자현미경(TEM)화고분변투사전자현미경(HRTEM)등수단진행료표정. XRD결과표명,소제비적BIT양품위층상개태광결구. FESEM결과표명,통과공제수열과정적반응삼수가이득도불동형모적납미입자.자외-가견만반사광보(UV-Vis DRS)표명BIT양품적대극능약위2.88-2.93 eV.이용가견광(λ>420 nm)조사하적갑기등(MO)강해실험평개료BIT양품적광최화성능.결과표명, BIT적광최화활성비참담TiO2(N-TiO2)고득다.연구료형모대BIT광최화성능적영향.소제비적BIT납미대광최화효솔최고,경가견광조사360 min,갑기등용액적강해솔가체도95.0%.
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 (λ>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.