| 微观形貌可控TiO2的制备及其光解水产氢性能 | |
| Synthesis and Photochemical Performances of Morphology-Controlled TiO2 Photocatalysts for Hydrogen Evolution under Visible Light | |
| 摘要: 通过简单的沉淀、水热、溶剂热和溶胶凝胶法分别制备出实心球(s-TiO2)、空心球(h-TiO2)、纳米管(a-TNT)和介孔形状(m-TiO2)的锐钛矿晶型结构TiO2光催化材料。采用HRTEM、FESEM、XRD、UV-Vis、N2吸-脱附和光解水制氢反应等对催化材料的微观表面结构、光吸收性能以及不同形貌光催化剂的光解水制氢的性能对比研究。结果表明：s-TiO2具有最高的光催化活性，主要归功于s-TiO2独特的微观形貌结构所致，s-TiO2是由亚微晶颗粒组成的介孔状实心球，亚微晶粒径相比较其它形貌的材料要小，有利于光生载流子的迁移，抑制电子-空穴对的体相复合，导致活性提高。同时，晶化过程用于传质通道的无序微孔可以束缚用作牺牲剂的CH2OH分子，使得空穴快速被牺牲剂消耗，减少与电子复合。 | |
| 关键词: 形貌 二氧化钛 光催化 水分解 氢气 | |
| 基金项目: 江苏省自然科学基金（No.BK20141350,BK20150692）和中央高校基本科研业务费专项基金（No.ZJ16063,ZJ16074）资助项目。 | |
| Abstract: TiO2 solid spheres (s-TiO2), hollow spheres (h-TiO2), nanotubes (a-TNT) and mesoporous TiO2 (m-TiO2) were morphology-controlled constructed via facile solution synthesis and solvent thermal methods. The different surface properties and electronic structures were characterized by HRTEM, FESEM, XRD, UV-Vis and N2 absorption-desorption measurements. The photocatalytic performance was evaluated by H2 evolution, which showed morphology-different photocatalytic activities. Among these TiO2 photocatalysts, s-TiO2 gave the best performance in the photocatalytic activity, which might be attributed to its special mesoporous solid spheres constructed by tiny well-crystallized TiO2 nanocrystals. The basic building blocks in the mesoporous solid spheres facilitated the transport of photo-excited carrier, and restricted the recombination of electron-hole pair, which enhanced the photocatalytic activity. Furthermore, the mesoporous structure of s-TiO2 showed the advantage in combining the methanol, a sacrificed agent, which easily consume the photo-excited holes and restrict the recombination of holes with photo-excited electrons. | |
| Keywords: morphology TiO2 photocatalysis water splitting hydrogen | |
| 投稿时间：2016-03-30 修订日期：2016-06-19 | |
| 摘要点击次数: 2045 | |
| 全文下载次数: 2060 | |
| 李曹龙,王飞,唐媛媛,唐俊彦,曹菲,上官文峰.微观形貌可控TiO2的制备及其光解水产氢性能[J].无机化学学报,2016,32(8):1375-1382. | |
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