Defective Black TiO(2): Effects of Annealing Atmospheres and Urea Addition on the Properties and Photocatalytic Activities.
Defective Black TiO(2): Effects of Annealing Atmospheres and Urea Addition on the Properties and Photocatalytic Activities.
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有缺陷的黑色TIO（2）：退火大气和尿素对性质和光催化活性的影响。
DOI：
10.3390/nano11102648
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发表时间：
2021-10-09
期刊：
影响因子：
--
通讯作者：
Zhou L
中科院分区：
文献类型：
--
作者：
Zhang X;Cai M;Cui N;Chen G;Zou G;Zhou L
采用简单的一步合成方法，通过在不同气氛（真空、He 或 N2）下煅烧，成功制备了一系列添加和不添加尿素的黑色 TiO2。通过各种技术对所制备的样品的物理化学、光学和光诱导电荷转移特性进行了表征。研究发现，真空气氛比惰性气体（He 和 N2）更有利于氧空位（OV）的形成，并且添加尿素抑制了 OV 的形成。在真空条件下退火的样品表现出更好的可见光吸附能力、更窄的带隙、更高的光生电荷分离效率和更低的复合率。羟基自由基（·OH）是真空退火样品中的主要氧化物质。最后，在真空条件下退火的样品比在He或N2下退火的样品表现出更高的亚甲基蓝（MB）降解光催化活性。基于上述，本研究为退火气氛和尿素添加对黑色TiO2性能的影响提供了新的见解。
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 N2). 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 N2) 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 (·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 N2. 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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