| 溶胶-凝胶法低温制备N掺杂TiO2可见光光催化剂 | |
| Preparation of N-doped TiO2 Visible Photocatalyst under Low Temperature via Sol-gel Process | |
| 摘要: 为了满足低温制备可见光光催化材料的需要，采用溶胶-凝胶法制备TiO2纳米晶溶胶，再与聚乙烯基吡咯烷酮(PVP)直接反应制备N掺杂TiO2可见光光催化剂。通过XPS分析，说明N取代了部分晶格中的O，UV-Vis漫反射吸收光谱显示，光催化剂具有明显的可见光响应，这是由于N原子的2p轨道位于O原子的2p轨道之上，从而使得价带和导带间的能量带隙变窄，引起吸收带红移，产生明显的可见光吸收。依靠亚甲基兰(MB)的可见光降解实验证明，N掺杂光催化剂具有良好的可见光光催化活性，16 h MB降解率接近25％。 | |
| 关键词: TiO2 光催化 可见光 | |
| 基金项目: | |
| Abstract: Using a facile sol-gel method, N-doped TiO2 photocatalyst with obvious absorption in visible region was prepared at low temperature (100 ℃), through a direct reaction between nanocrystalline TiO2 sol and Polyvinylpyrrolidone (PVP). The results of X-ray photoelectron spectroscopy (XPS) showed the existence of N-Ti-N and O-Ti-N species, indicating the successful doping of N atoms, which were substituted for lattice oxygen without any influence on the crystalline phase of TiO2. In contrast to the undoped samples, the N-doped TiO2 photocatalyst could readily photodegrade methylene blue (MB) under visible light irradiation. The visible-light catalytic activity of thus-prepared photocatalyst resulted from the effect of the doped nitrogen, which gives high absorbance in the visible light range. In the substitutional N to O structure some N2p states lie above the O2p valence band, leading to a band-gap narrowing and obvious visible response. | |
| Keywords: TiO2 photocatalysis visible light | |
| 摘要点击次数: 1226 | |
| 全文下载次数: 1963 | |
| 盛永刚,梁丽萍,徐 耀,姜 东,吴 东.溶胶-凝胶法低温制备N掺杂TiO2可见光光催化剂[J].无机化学学报,2008,24(1):78-82. | |
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