期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 237, 期 -, 页码 938-946出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2018.06.071
关键词
Carbon nitride; O/Ba co-functionalization; ROS; Photocatalytic NO oxidation; Toxic intermediate
资金
- National Natural Science Foundation of China [51478070, 21501016, 21777011]
- National Key RD project [2016YFC0204702]
- Innovative Research Team of Chongqing [CXTDG201602014]
- Natural Science Foundation of Chongqing [cstc2017jcyjBX0052]
- Plan for National Youth Talents of the Organization Department of the Central Committee
The generation of toxic intermediates during the photocatalytic reaction can result in the accumulation of secondary pollutants and lead to decreased performance. Here, we first designed an O/Ba co-functionalized amorphous carbon nitride (labeled as O-ACN-Ba) by conducting targeted density functional theory calculations for short-range and directional charge transfer in electronic transportation channels. Also, the O-ACN-Ba is synthesized via a one-step in situ co-pyrolysis of urea and BaCO3. The unique electronic structure O-ACN-Ba enables highly enhanced photocatalytic NO removal rate and suppresses the generation of toxic intermediate (NO2). The O and Ba are co-functionalized as a surface electronic trapping adjuster and an interlayer electronic trapping mediator to induce the convergence and localization of intralayer-delocalized electrons. Such internal electronic structure can facilitate the adsorption and activation of NO and O-2, elongate the lifetime of photo generated carriers, and expedite the spatial charge separation to boost significantly the generation of reactive oxygen species, thus suppressing toxic NO2 generation. In addition, the photocatalytic NO conversion pathway on O-ACN-Ba is characterized, and an important reaction intermediate-nitrosyl species Ba-NO delta((+)) is discovered and found to promote the selective conversion of NO to final products (nitrites or nitrates). This work proposes a novel strategy to advance the application of photocatalytic technology for efficient and safe air purification.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据