文献类型：期刊文献

英文题名：Surface defects engineered Bi4Ti3O12 nanosheets for photocatalytic degradation of antibiotic levofloxacin

作者：Wei, Shunhang[1,2,3]; Chen, Yuxing[1]; Wu, Pingru[1]; Liu, Xingen[1]; Ren, Jun[1]; Yao, Bo[1,2]; Xu, Haitao[1,2]; Dou, Weidong[1]; Wang, Yawei[4]; Wu, Rong[5]; Fang, Zebo[1,2]; Liang, Qifeng[1]

机构：[1] Department of Physics, Shaoxing University, Shaoxing, 312000, China; [2] Zhejiang Engineering Research Center of MEMS, Shaoxing University, Shaoxing, 312000, China; [3] College of Physics, Sichuan University, Chengdu, 610064, China; [4] School of Chemistry and Chemical Engineering, Jiujiang University, Jiujiang, 332005, China; [5] School of Physics Science and Technology, Xinjiang University, Urumqi, 830000, China

年份：2022

卷号：640

外文期刊名：Applied Catalysis A: General

收录：EI(收录号：20222112143431)、Scopus(收录号：2-s2.0-85130387184)

语种：英文

外文关键词：Nanosheets - Surface defects - Titanium dioxide - Density functional theory - Hole concentration - Photocatalytic activity

外文摘要：Surface defects have a significant effect on the photocatalytic reaction of Bi4Ti3O12, but the mechanism is unclear. In addition, when surface defects and highly exposed facets exist at the same time, which factor plays the main role in photocatalytic activity is also controversial. Herein, it is found that Bi4Ti3O12 with adjustable concentrations of surface defects and percentage of exposed {001} facets can be prepared by using titania of different crystal types and sizes as raw materials, which is extremely beneficial for exploring the above problems. The photocatalytic activity of Bi4Ti3O12 nanosheets with surface defects and exposed {001} facets was the same as that of Bi4Ti3O12 nanosheets with surface defects alone (about 72.5% of photodegradation levofloxacin under 10 min of simulated sunlight irradiation). Based on the experimental results and density functional theory calculations, the influence mechanism of surface defects was deeply studied. The surface defects resulting from partial exfoliation of the external (Bi2O2)2+ layers changed band structure of Bi4Ti3O12. More importantly, surface defects with high concentration became hole trapping sites, which was conducive to the faster participation of holes in the photocatalytic oxidation process. ? 2022 Elsevier B.V.