Zhang Yanzhao, Wang Xiya, Dong Peimei, Huang Zhengfeng, Nie Xiaoxiao, Zhang Xiwen
State Key Laboratory of Silicon Materials Science, School of Material Science & Engineering, Zhejiang University Hangzhou Zhejiang 310027 P. R. China
RSC Adv. 2018 Apr 30;8(29):15991-15998. doi: 10.1039/c8ra02362j. eCollection 2018 Apr 27.
Doping with intrinsic defects to enhance the photocatalytic performance of TiO has recently attracted attention from many researchers. In this report, we developed an original approach to realise stabilized surface doping using intrinsic defects with the loading of Ag nanoparticles (AgNPs) on the surface. Herein, atmospheric pressure dielectric barrier discharge (DBD) cold plasma was used to help load the AgNPs, and ethanol treatment was used to introduce intrinsic defects (oxygen vacancies and Ti) on the surface of materials. This method avoids environmentally hazardous reducing regents and is undertaken under atmospheric pressure, thus reducing energy-consuming and complex operation. We combine the advantages of noble metal nanoparticles and surface doping to enhance the photocatalytic performance under the visible light. The characterization of the materials indicates that the loading of AgNPs and introduction of intrinsic defects can change the electronic structure of the composite material and improve its efficiency. The samples show significant enhancement in CO photoreduction to obtain CO and CH, with yields reaching 141 μmol m and 11.7 μmol m, respectively. The formation mechanism of the method for TiO modification and CO reduction is also discussed.
利用本征缺陷掺杂以提高TiO的光催化性能最近引起了许多研究人员的关注。在本报告中，我们开发了一种原始方法，通过在表面负载银纳米颗粒（AgNPs）利用本征缺陷实现稳定的表面掺杂。在此，使用大气压介质阻挡放电（DBD）冷等离子体来辅助负载AgNPs，并使用乙醇处理在材料表面引入本征缺陷（氧空位和Ti）。该方法避免了对环境有害的还原剂，并且在大气压下进行，从而降低了能耗和操作复杂性。我们结合了贵金属纳米颗粒和表面掺杂的优点，以增强可见光下的光催化性能。材料表征表明，AgNPs的负载和本征缺陷的引入可以改变复合材料的电子结构并提高其效率。样品在CO光还原为CO和CH方面表现出显著增强，产率分别达到141 μmol m和11.7 μmol m。还讨论了TiO改性和CO还原方法的形成机理。
