PVA‐Assisted Hydrothermal Synthesis of SrTiO3 Nanoparticles with Enhanced Photocatalytic Activity for Degradation of RhB
PVA‐Assisted Hydrothermal Synthesis of SrTiO3 Nanoparticles with Enhanced Photocatalytic Activity for Degradation of RhB
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DOI：
10.1111/j.1551-2916.2008.02716.x
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发表时间：
2008-11
影响因子：
3.9
通讯作者：
Xiao Wei;Gang Xu;Z. Ren;Chunxiao Xu;G. Shen;G. Han
中科院分区：
文献类型：
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作者：
Xiao Wei;Gang Xu;Z. Ren;Chunxiao Xu;G. Shen;G. Han
以聚乙烯醇（PVA）为助溶剂，采用水热法成功合成了不同粒径的钛酸锶（SrTiO 3）纳米粒子。采用X射线衍射、能谱和扫描电子显微镜对合成的SrTiO 3纳米粒子进行了表征。结果表明，随着PVA浓度的增加，合成样品的粒径和Sr/Ti摩尔比减小，比表面积增加。当PVA浓度不小于1.6g/L时，样品的Sr/Ti摩尔比小于1，表明样品中存在锶空位（VSr）。以罗丹明B（RhB）为降解对象，研究了它们在紫外光（λ=200-400 nm）照射下的光催化活性。结果表明，PVA辅助水热合成的纳米SrTiO 3粉体的光催化活性高于未添加PVA的样品。最高的光催化活性，获得了与中间PVA浓度制备的样品，所产生的颗粒尺寸，比表面积，VSr形成，和吸附能力的综合效果。
Strontium titanate (SrTiO3) nanoparticles with different particle sizes have been synthesized successfully via a hydrothermal route with the help of polyvinyl alcohol (PVA). The as-synthesized SrTiO3 nanoparticles were characterized by X-ray diffraction, energy-dispersive X-ray spectroscopy, and scanning electron microscopy. It was found that the particle size and the Sr/Ti molar ratio of the as-synthesized samples decreased with increasing PVA concentration, accompanied by an increase in the specific surface area. When the PVA concentration was no <1.6 g/L, the Sr/Ti molar ratios of the as-synthesized samples were <1, indicating that a strontium vacancy (VSr) formed. Their photocatalytic activities were investigated through the degradation of rhodamine B (RhB) under exposure to ultraviolet (UV) radiation (λ=200–400 nm). The results indicated that the photocatalytic activities of the PVA-assisted hydrothermally synthesized nanocrystalline SrTiO3 powders were higher than that of the sample prepared without PVA. The highest photocatalytic activity was obtained for the sample prepared with an intermediate PVA concentration, arising from the combined effect of the particle size, specific surface area, VSr formation, and the adsorption capacity.