Air pollution has become a globally prominent environmental problem, in which nitrogen oxide (NO, ∼ 95 % NO and NO) is one of the most serious pollutants, how to remove low-concentered NO from the air without producing secondary pollution is becoming a challenging task. Environmental nanomaterial based photocatalytic technique is considered as a green technology for the removal of dilute NO (∼ ppb) due to its low costs, high efficiencies and environmental friendless. Photocatalysts with certain surface defects, e.g., oxygen vacancies (OVs) have attracted huge interests with appreciable effectiveness for the NO removal as they affect essential steps of the photocatalytic reactions. Considering the advantages of OV for the NO conversion, this review systematically summarizes the methods of defect creation (e.g., OVs), characterizations, detailed reaction mechanisms during the photocatalytic NO removal. This review presents the state-of-the-arts, applications and vital roles of OVs including extending light absorption, promoting carrier separation, strengthening the surface-interface reactions in the photocatalytic NO oxidations. Based on these, several challenges and prospects of surface defect engineering in semiconducting materials are proposed for the further application of OV for NO conversion as well as the removal of other potential atmospheric hazardous.

中文翻译：

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氧空位在光催化氮氧化物去除中的最新进展和作用


空气污染已成为全球突出的环境问题，其中氮氧化物（NO、~95%NO和NO）是最严重的污染物之一，如何去除空气中低浓度的NO而不产生二次污染成为一个具有挑战性的问题任务。基于环境纳米材料的光催化技术因其成本低、效率高、环境友好而被认为是去除稀NO（∼ppb）的绿色技术。具有某些表面缺陷（例如氧空位（OV））的光催化剂引起了人们的极大兴趣，因为它们影响光催化反应的基本步骤，并且对于去除 NO 具有显着的效果。考虑到OV在NO转化方面的优势，本文系统地总结了光催化NO去除过程中缺陷产生（例如OV）的方法、表征、详细反应机制。本综述介绍了 OV 的最新技术、应用和重要作用，包括延长光吸收、促进载流子分离、加强光催化 NO 氧化中的表面界面反应。在此基础上，提出了半导体材料表面缺陷工程的一些挑战和前景，以进一步应用OV进行NO转化以及消除其他潜在的大气有害物质。