Synthesis and optical properties of Bi3+ doped NaTaO3 nano-size photocatalysts.
Synthesis and optical properties of Bi3+ doped NaTaO3 nano-size photocatalysts.
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DOI：
10.1166/jnn.2010.2122
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发表时间：
2010-03
影响因子：
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通讯作者：
Xiaojing Wang;H. Bai;Y. Meng;Yanhong Zhao;C. Tang;Youzhi Gao
中科院分区：
文献类型：
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作者：
Xiaojing Wang;H. Bai;Y. Meng;Yanhong Zhao;C. Tang;Youzhi Gao
采用水热法合成了Bi掺杂和未掺杂的结晶良好的NaTaO 3纳米粒子。X射线衍射（XRD）图谱显示出系统的位移向低角度，这是其次由加宽的峰作为Bi 3+的掺杂剂含量的增加。Bi 3+在NaTaO 3中的掺杂也被发现引起更细的颗粒尺寸。对于未掺杂的样品，透射电子显微镜（TEM）显示结晶良好的立方形貌，然而，改变到相当粗糙的表面和有点不规则的扭曲立方体形状的几何形状与添加Bi 3+。从高分辨率透射电子显微镜（HRTEM）的研究中，晶格d-间距的增加，证明了结晶细胞体积的膨胀。漫反射光谱显示出吸收波长随着Bi 3+掺杂而红移，这表明带隙能量降低。在435 nm的光致发光（PL）光谱中观察到TaO 6八面体单元的发射。随着Bi 3+掺杂量的增加，发光强度逐渐增强，这是由于Bi 3+取代Ta 5+导致氧空位增加所致。以亚甲基蓝的光催化降解为模型反应考察了样品的活性。结果表明，随着Bi ~（3+）含量的增加，催化剂的活性降低。
Well-crystallized NaTaO3 nanoparticles doped with and without Bi were synthesized by a hydrothermal method. X-ray diffraction (XRD) patterns showed a systematic shift toward lower angles, which was followed by broadened peaks as the dopant content of Bi3+ increased. The doping of Bi3+ in NaTaO3 was also found to give rise to finer particle sizes. For undoped samples, transmission electron microscopy (TEM) showed the well-crystallized cubic morphology, which however, changed to fairly rough surfaces and somewhat irregular distorted cube-like shaped geometries with the addition of Bi3+. The swelling of the crystallized cell volume was demonstrated by the increased lattice d-spacing from high-resolution transmission electron microscopy (HRTEM) studies. The diffuse reflection spectra showed a red shift in absorbance wavelength with Bi3+ doping, which suggests a decreased band gap energy. Emissions of the TaO6 octahedra unit were observed at 435 nm in the photoluminescence (PL) spectra. The PL intensities increased with the doping content of Bi3+, which was attributed to the increase of oxygen vacancies caused by the substitution of Ta5+ by Bi3+. The photocatalytic degradation of methylenebluechloride was taken as the model reaction to examine the activity of the sample. It was found that the activity decreased with the Bi3+ content.