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

文献类型： 外文期刊

作者： Zhang, Xu 1 ; Cai, Min 1 ; Cui, Naxin 1 ; Chen, Guifa 1 ; Zou, Guoyan 1 ; Zhou, Li 1 ;

作者机构： 1.Shanghai Acad Agr Sci, Inst Ecoenvironm & Plant Protect, Shanghai 201403, Peoples R China

2.Shanghai Engn Res Ctr Low Carbon Agr, Shanghai 201403, Peoples R China

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.

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