| 掺镁钛酸钡纳米棒的水热合成和光催化性能(英文) | |
| Hydrothermal Synthesis and Photocatalytic Properties of Nanostructures Magnesium Doped BaTiO3 | |
| 摘要: 用水热法制备掺镁钛酸钡(Ba1-xMgxTiO3(x=0, 0.10, 0.20, 0.30, 0.40), BMT)纳米粉体。运用X射线衍射仪(XRD)、场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)、紫外可见漫反射光谱技术(DRS)等手段对样品进行了表征，并在可见光照射下于溶液中考察了其光催化降解甲基橙反应活性。结果表明，通过控制氢氧根浓度可以得到不同形貌的纳米粉体。基于不同条件下制备的样品的微结构分析，提出了这些不同形貌的形成机制。制备出的BMT材料的带隙能约为2.61 eV。光催化反应结果表明BMT的光催化活性比掺氮TiO2高得多。OH-浓度为8 mol·L-1时制备的BMT纳米棒光催化效率最高，经可见光照射360 min，浓度为0.01 mmol·L-1甲基橙溶液的降解率可达到93.0%，且循环使用4次后，其光催化活性并没有明显降低，表明BMT是一种稳定有效的可见光催化剂. | |
| 关键词: 钛酸钡 掺镁 纳米结构 水热合成 光催化降解 可见光照射 | |
| 基金项目: | |
| Abstract: Magnesium doped barium titanate photocatalysts (Ba1-xMgxTiO3(x=0, 0.10, 0.20, 0.30, 0.40), BMT) were synthesized by a facile hydrothermal process without the use of any surfactants or templates and characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), and UV-Vis diffuse reflectance spectroscopy (DRS). FESEM results show that different morphologies could be fabricated by simply manipulating the concentrations of hydroxide ions. In this case, hydroxide ions seem to play a key role in controlling the formation of seeds and growth rates of BMT particles. On the basis of structural analysis of samples obtained at different conditions, a possible mechanism for the formation of these distinctive morphologies is proposed. UV-Vis DRS results demonstrate that the band gap of BMT sample is about 2.61 eV. The as-prepared BMT photocatalysts exhibite higher photocatalytic activities for the degradation of methyl orange (MO) under visible light irradiation than that of N-TiO2 obtained by the traditional method. Furthermore, BMT nanorods prepared at OH- concentration of 8 mol·L-1 show the highest photocatalytic activity. A 93.0% degradation of MO solution (0.01 mmol·L-1) is obtained over this catalyst after visible light irradiation for 360 min. In addition, there is no significant decrease in the photocatalytic activity after 4 recycles, indicating that BMT is a stable photocatalyst for degradation of MO under visible light irradiation. | |
| Keywords: barium titanate Mg-doping hydrothermal method photocatalytic degradation visible light irradiation | |
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| 林 雪,关庆丰,李海波,巴春华,王丹丹,孟繁骏.掺镁钛酸钡纳米棒的水热合成和光催化性能(英文)[J].无机化学学报,2012,28(10):2248-2256. | |
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