Xiao Yang, Chen Shihao, Wang Yinhai, Hu Zhengfa, Zhao Hui, Xie Wei
School of Physics & Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China.
Synergy Innovation Institute for Modern Industries, Guangdong University of Technology, Dongyuan 517500, China.
Nanomaterials (Basel). 2019 Jun 14;9(6):883. doi: 10.3390/nano9060883.
Modification of the surface properties of SrTiO crystals by regulating the reaction environment in order to improve the photocatalytic activity has been widely studied. However, the development of a facile, effective, and universal method to improve the photocatalytic activity of these crystals remains an enormous challenge. We have developed a simple method to modify the surface environment of SrTiO by ethanol quenching, which results in enhanced UV, visible and infrared light absorption and photocatalytic performance. The SrTiO nanocrystals were preheated to 800 °C and immediately quenched by submersion in ethanol. X-ray diffraction patterns, electron paramagnetic resonance spectra, and X-ray photoelectron spectra indicated that upon rapid ethanol quenching, the interaction between hot SrTiO and ethanol led to the introduction of a high concentration of oxygen vacancies on the surface of the SrTiO lattice. Consequently, to maintain the regional charge balance of SrTiO, Sr could be substituted for Ti. Moreover, oxygen vacancies induced localized states into the band gap of the modified SrTiO and acted as photoinduced charge traps, thus promoting the photocatalytic activity. The improved photocatalytic performance of the modified SrTiO was demonstrated by using it for the decomposition of rhodamine B and production of H from water under visible or solar light.
通过调节反应环境来改变钛酸锶晶体的表面性质以提高其光催化活性已得到广泛研究。然而，开发一种简便、有效且通用的方法来提高这些晶体的光催化活性仍然是一个巨大的挑战。我们已经开发出一种通过乙醇猝灭来改变钛酸锶表面环境的简单方法，这导致其对紫外光、可见光和红外光的吸收以及光催化性能增强。将钛酸锶纳米晶体预热至800℃，然后立即浸入乙醇中进行猝灭。X射线衍射图谱、电子顺磁共振谱和X射线光电子能谱表明，在快速乙醇猝灭过程中，热的钛酸锶与乙醇之间的相互作用导致在钛酸锶晶格表面引入了高浓度的氧空位。因此，为了维持钛酸锶的区域电荷平衡，锶可以替代钛。此外，氧空位在改性钛酸锶的带隙中引入了局域态，并作为光生电荷陷阱，从而促进了光催化活性。通过将改性钛酸锶用于罗丹明B的分解以及在可见光或太阳光下从水中制氢，证明了其光催化性能得到了改善。
