【作者】 刘平； Sun Ya-Ping； 付贤智； 王绪绪； 李旦振；

【机构】 福州大学光催化研究所； Clemson大学化学系；

【摘要】 采用Nafion薄膜作模板合成了平均直径为4.0纳米的TiO₂晶体粒子。利用高分辨电子显微镜（HRTEM）、X-射线衍射仪（XRD）和紫外-可见光谱仪（UV-VIS）,对Nafion中TiO₂的含量、粒子大小分布、纳米晶体的光谱响应、纳米晶体微观型貌及其结构和TiO₂粒子形成机理等进行了研究。研究结果表明,Nafion中Ti⁴⁺含量不仅与起始原料有关,还与起始物浓度有关。TiO₂在Nafion中的形成速度主要受控于水在膜中的扩散速度,而TiO₂晶体粒子的大小与分布则取决于Nafion的孔径,与起始原料种类以及晶化条件无关。文中还讨论了Nafion中TiO₂作为光催化剂的可行性。更多还原

【Abstract】 The nanocrystalline titanium dioxide with an average particle diameter of 4. 0nm was synthesized in Nafion membranes. High resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD) and Uv-vis-nir spectrophotometer were attempted to characterize the morphologies, grain size distribution, spectroscopic responsibility, microstructure of the crystalline and formation mechanism of the particles. The results show that the quantity of Ti4+ in Nafion depends on the concentration of Ti(OC3H7)4 in soaking solution beside the kind of precursor. The formation rate to transform titanium isopropoxide to TiO2 was controlled by the diffuse of water to enter Nafion via the channels. The size of nanocrystalline matched with the diameter of cavities in Nafion, and was independent of the kind of precursor, the concentration of Ti4+ and Crystallization condition. The feasibility was discussed in this paper for TiO2 to act as a photocatalyst in Nafion.更多还原