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Abstract：
Although titanium dioxide (TiO2) has a wide range of potential applications, the photocatalytic performance of TiO2 is limited by both its limited photoresponse range and fast recombination of the photogenerated charge carriers. In this work, the preparation of nitrogen (N)-doped TiO2 accompanied by the introduction of oxygen vacancy (Vo) has been achieved via a facile annealing treatment with urea as the N source. During the annealing treatment, the presence of urea not only realizes the N-doping of TiO2 but also creates Vo in N-doped TiO2 (N-TiO2), which is also suitable for commercial TiO2 (P25). Unexpectedly, the annealing treatment-induced decrease in the specific surface area of N-TiO2 is inhibited by the N-doping and, thus, more active sites are maintained. Therefore, both the N-doping and formation of Vo as well as the increased active sites contribute to the excellent photocatalytic performance of N-TiO2 under visible light irradiation. Our work offers a facile strategy for the preparation of N-TiO2 with Vo via the annealing treatment with urea.
摘要：
虽然二氧化钛(TiO2)具有广泛的潜在应用,TiO2的光催化性能受到其有限的光响应范围和光生电荷载流子的快速复合的限制。在这项工作中,通过以尿素为N源的简单退火处理，可以制备氮（N）掺杂的TiO2并引入氧空位（Vo）。在退火处理期间，尿素的存在不仅实现了TiO2的N掺杂，而且在N掺杂的TiO2（N-TiO2）中产生了Vo，这也适用于商业TiO2(P25)。出乎意料的是,N掺杂抑制了退火处理引起的N-TiO2比表面积的降低,因此，保持更活跃的网站。因此,N掺杂和Vo的形成以及增加的活性位点都有助于N-TiO2在可见光照射下的优异光催化性能。我们的工作为通过尿素退火处理制备具有Vo的N-TiO2提供了一种简便的策略。
