| 在紫外和可见光下具有高催化活性的珊瑚状金红石型二氧化钛的制备 | |
| Preparation of Coral-like Rutile Titania with Enhanced Photocatalytic Activity under UV and Visible Light | |
| 摘要: 采用溶剂热法在二乙二醇溶液中制备了珊瑚状的金红石二氧化钛（Rut-dg）。扫描电子显微镜（SEM）和X射线衍射（XRD）表明样品呈均匀分散的球形颗粒，直径约为1 μm，表面具有珊瑚状的突起结构，半径约10 nm。氮气吸附-脱附结果表明样品比表面达到228 m2·g-1，是商品金红石的7倍多。由于其特殊的形貌，Rut-dg在紫外光下的催化产氢量达到25 000 μmol·g-1·h-1，比P25高出50%，是商品金红石活性的13倍。在可见光下的产氢量为270 μmol·g-1·h-1，而P25和商品金红石则没有明显活性。进一步实验表明，Rut-dg样品表面检测不到可能引起活性增加的有机杂质存在，因此，珊瑚状的形貌是影响活性的重要因素。样品在300℃焙烧后，珊瑚状表面结构明显烧结，比表面下降了50%，导致产氢量下降了15%~25%，这也说明珊瑚状结构大大促进了光催化产氢活性的提高。 | |
| 关键词: 水热法 金红石二氧化钛 多相催化 分解水 光分解 产氢 | |
| 基金项目: 徐州市重点研发计划（社会发展）项目（No.KC17154）资助。 | |
| Abstract: Coral-like rutile titania (Rut-dg) was synthesized by solvothermal method in diethylene glycol solution. Scanning electron microscope (SEM) and X-ray diffraction (XRD) indicated the spherical particles were homogeneously dispersed with the diameter about 1 μm, consisting regular arranged branches on the surface with diameter less than 10 nm. The BET surface area was as large as 228 m2·g-1, more than 7 times of commercial rutile titania sample. Given its unique morphology, the Rut-dg showed superior photocatalytic activity with hydrogen evolution 25 000 μmol·g-1·h-1 under ultraviolet irradiation, 50% higher than P25 and 13 times of commercial rutile sample. The hydrogen production under visible light was 270 μmol·g-1·h-1, while P25 and commercial rutile had no obvious activity. Further investigation demonstrated that no organics could be detected on the surface of Rut-dg, indicating the coral-like structures played the key role for the photocatalytic activity. After calcined at 300℃, the coral-like structures were sintered obviously and the surface area decreased by 50%. Meanwhile, the hydrogen production decreased by 15%~25%, also implying that the coral-like structures facilitated the hydrogen production dramatically. | |
| Keywords: solvothermal rutile titania heterogeneous catalysis water splitting photolysis hydrogen generation | |
| 投稿时间：2019-01-21 修订日期：2019-05-22 | |
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| 朱捷,葛奉娟,陈艳,徐艳,张学杨,邹伟欣,董林.在紫外和可见光下具有高催化活性的珊瑚状金红石型二氧化钛的制备[J].无机化学学报,2019,35(8):1470-1476. | |
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