| 田长水,刘雅婷,盛文龙,汪国庆,姜宏,熊春荣.介孔SiO2球为模板制备TiO2纳米纤维及光催化合成氨[J].分子催化,2016,30(6):566-574 |
| 介孔SiO2球为模板制备TiO2纳米纤维及光催化合成氨 |
| Preparation of TiO2 Nanofibers Templated with Mesoporous SiO2 Spheres and Photocatalytic Synthesis of Ammonia |
| 投稿时间：2016-11-16 修订日期：2016-12-14 |
| DOI： |
| 中文关键词: 介孔SiO2球 TiO2纳米纤维 非晶态合金 合成氨 光催化 |
| 英文关键词:Mesoporous silica spheres TiO2 nanofibers Modified by amorphous alloy Synthesis of ammonia Photocatalysis |
| 基金项目: |
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| 摘要点击次数: 1583 |
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| 中文摘要: |
| 以介孔SiO2球为模板，TiCl4为前躯体，制备了高催化活性的TiO2纳米纤维以及非晶态合金(Ni-Mo-B)修饰的纳米纤维。TiO2纳米纤维直径为7~10nm，结晶度高，不仅对紫外光有很强的吸光度，而且对可见光也有一定程度的吸收。此外，纳米纤维降低了荧光强度，稳定了光生电子-空穴对。经过非晶态合金(Ni-Mo-B)修饰的纳米纤维进一步降低了荧光强度。在紫外光催化N2与水合成氨的反应中，当反应时间为2h时， P25氨氮产量为31μmol，Ti的转换频率(TOF)为0.25?h-1。纯TiO2纳米纤维氨氮产量提高了~71%，达53 μmol，Ti的转换频率(TOF)提高到了0.8?h-1。经过非晶态合金修饰的纳米纤维，氨氮产量达66 μmol，Ti的转换频率(TOF)为0.95?h-1，比P25提高了113% |
| 英文摘要: |
| TiO2 nanofibers were fabricated using mesoporous silica spheres as template, titanium tetrachloride as precursor. The as-made nanofibers can be further modified with amorphous alloy（Ni-Mo-B).The nanofibers were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-Vis diffuse reflectance and Fluorescence (PL). The TiO2 nanofibers was highly crystalline anatase with a diameter of 7~10nm. The nanofibers not only have a strong UV absorbance, but also some absorption of visible light. Moreover, the nanofibers reduced the fluorescence intensity and stabilized the photogenerated electron-hole pairs. Furthermore, the amorphous alloy (Ni-Mo-B) modified nanofibers might also decrease the fluorescence intensity and greatly enhance the absorption of visible light. In the photocatalytic synthesis of ammonia with a reaction time of 2h, the yield of ammonia over P25 was 31 μmol, the TOF was 0.25?h-1. However, the yield was increased by 71%, and reached 53μmol over the TiO2 nanofibers. The corresponding TOF was 0.8?h-1. For the amorphous alloy modified ones, the yield was 66 μmol, the TOF was 0.95?h-1, with an increase of 113% compared to P25 |
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