Defective Black TiO2: Effects of Annealing Atmospheres and Urea Addition on the Properties and Photocatalytic Activities

文献类型： 外文期刊

第一作者： Zhang, Xu

作者： Zhang, Xu;Cai, Min;Cui, Naxin;Chen, Guifa;Zou, Guoyan;Zhou, Li;Zhang, Xu;Cai, Min;Cui, Naxin;Chen, Guifa;Zou, Guoyan;Zhou, Li

作者机构：

关键词： black TiO2; annealing atmosphere; urea; oxygen vacancy; photocatalytic activity

期刊名称：NANOMATERIALS （ 影响因子：5.076； 五年影响因子：5.346 ）

ISSN：

年卷期： 2021 年 11 卷 10 期

页码：

收录情况： SCI

摘要： A series of black TiO2 with and without the addition of urea were successfully prepared using a simple one-step synthetic method by calcination under different atmospheres (vacuum, He, or N-2). The physicochemical, optical, and light-induced charge transfer properties of the as-prepared samples were characterized by various techniques. It was found that a vacuum atmosphere was more beneficial for the formation of oxygen vacancies (OVs) than the inert gases (He and N-2) and the addition of urea-inhibited OVs formation. The samples annealed in the vacuum condition exhibited better visible-light adsorption abilities, narrower bandgaps, higher photo-induced charge separation efficiency, and lower recombination rates. Hydroxyl radicals (& BULL;OH) were the dominant oxidative species in the samples annealed under a vacuum. Finally, the samples annealed under vacuum conditions displayed higher photocatalytic activity for methylene blue (MB) degradation than the samples annealed under He or N-2. Based on the above, this study provides new insights into the effects of annealing atmospheres and urea addition on the properties of black TiO2.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序