Bi3.25La0.75Ti3O12纳米线的可见光催化性能

引用本文: 林雪, 吕鹏, 关庆丰, 李海波, 李洪吉, 蔡杰, 邹阳. Bi_3.25La_0.75Ti₃O₁₂纳米线的可见光催化性能[J]. 物理化学学报, 2012, 28(08): 1978-1984. doi: 10.3866/PKU.WHXB201205172 shu

Citation: LIN Xue, Lü Peng, GUAN Qing-Feng, LI Hai-Bo, LI Hong-Ji, CAI Jie, ZOU Yang. Visible Light Photocatalytic Properties of Bi_3.25La_0.75Ti₃O₁₂ Nanowires[J]. Acta Physico-Chimica Sinica, 2012, 28(08): 1978-1984. doi: 10.3866/PKU.WHXB201205172 shu

Bi_3.25La_0.75Ti₃O₁₂纳米线的可见光催化性能

林雪 ^1,2, ,
吕鹏 ^1, ,
关庆丰 ^1, ,
李海波 ^3, ,
李洪吉 ^2, ,
蔡杰 ^1, ,
邹阳 ^1,

基金项目:
环境友好材料制备与应用教育部重点实验室项目资助

摘要:

研究了用一步水热法制备的掺镧钛酸铋(Bi_3.25La_0.75Ti₃O₁₂, BLT)纳米线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)、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. 结果表明, 制备的纳米线为纯相的Bi_3.25La_0.75Ti₃O₁₂, 平均直径约为25 nm. 室温光致发光谱(PL)显示BLT纳米线在433和565 nm附近有较强的发射峰, 分别对应激子发射和表面缺陷发光. 紫外-可见漫反射光谱(UV-Vis DRS)表明BLT样品的带隙能约为2.07 eV. 利用可见光(λ>420 nm)照射下的甲基橙降解实验评价了BLT样品的光催化性能. 结果表明, BLT的光催化活性比商用TiO₂催化剂P25、掺氮TiO₂和纯相钛酸铋(Bi₄Ti₃O₁₂, BIT)高得多. BLT光催化剂具有更高催化活性的原因是La³⁺离子掺杂拓展了BIT对可见光的吸收范围, 同时抑制了BIT的光生电子-空穴的复合.

关键词:

English

Visible Light Photocatalytic Properties of Bi_3.25La_0.75Ti₃O₁₂ Nanowires

1.
1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu Porvnce, P. R. China;
2. College of Chemistry, Key Laboratory of Preparation and Application Environmentally Friendly Materials of the Ministry of Education, Jilin Normal University, Siping 136000, Jilin Porvnce, P. R. China;
3. College of Physics, Jilin Normal University, Siping 136000, Jilin Porvnce, P. R. China
Received Date: 09 April 2012
Available Online: 10 July 2012
Fund Project:
环境友好材料制备与应用教育部重点实验室项目资助

Abstract:

Lanthanum-doped bismuth titanate (Bi_3.25La_0.75Ti₃O₁₂, BLT) nanowires were synthesized by a one-step hydrothermal process and their optical and photocatalytic properties were investigated. Their crystal structure and microstructures were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). The BLT nanowires obtained are single-phase with an average diameter of 25 nm. The room temperature photoluminescence (PL) spectrum reveals two visible emission peaks at 400 and 596 nm, which are assigned to excitonic and surface-defect emissions, respectively. The UV-visible diffuse reflectance spectrum (UV-Vis DRS) reveals that the band gap of BLT nanowires is 2.07 eV. The prepared BLT nanowires are stable and exhibit higher photocatalytic activities in the degradation of methyl orange (MO) under visible light irradiation (λ >420 nm) compared with commercial P25 TiO₂, traditional N-doped TiO₂ (N-TiO₂), and pure bismuth titanate (Bi₄Ti₃O₁₂, BIT). The high photocatalytic performance of BLT photocatalysts is attributed to the strong visible light absorption and the recombination restraint of the e^-/h⁺ pairs resulting from the presence of La³⁺ ions.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

Bi_3.25La_0.75Ti₃O₁₂纳米线的可见光催化性能

English

Visible Light Photocatalytic Properties of Bi_3.25La_0.75Ti₃O₁₂ Nanowires

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