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In-situ nitrogen-doped black TiO2 with enhanced visible-light-driven photocatalytic inactivation of Microcystis aeruginosa cells: Synthesization, performance and mechanism

文献类型： 外文期刊

作者： Zhou, Li 1 ; Cai, Min 1 ; Zhang, Xu 1 ; Cui, Naxin 1 ; Chen, Guifa 1 ; Zou, Guo-yan 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： Nitrogen-doped black TiO2; Nitrogen impurity; Oxygen vacancies; Bandgap narrowing; Photocatalysis mechanism

期刊名称：APPLIED CATALYSIS B-ENVIRONMENTAL （ 影响因子：19.503； 五年影响因子：17.291 ）

ISSN： 0926-3373

年卷期： 2020 年 272 卷

页码：

收录情况： SCI

摘要： A series of nitrogen-doped black TiO2 nanocatalysts were successfully synthesized by a one-step method. It is novel to find that calcination in an N-2 atmosphere completed N doping and oxygen vacancies production simultaneously. In contrast, the urea addition as N precursor inhibited the nitrogen incorporation and the oxygen vacancies production. However, it is the sample using urea as N precursor that had the higher visible-light absorption, the narrower bandgap, the more efficient excited charges separation and higher degradation efficiency for removing chlorophyll-a in Microcystis aeruginosa algae cells. Mechanism exploration indicated that the intermediate energy states existed within the bandgap of TiO2, and center dot O-2(-) and center dot OH were the dominant radicals responsible for algae cell damage and organic matter degradation. This research will provide additional insight into the roles of N precursors and a calcining atmosphere to improve the photocatalytic activity of nitrogen-doped black TiO2 for algae inactivation and metabolites degradation.

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