石墨烯
兴奋剂
材料科学
氧化物
氧气
化学工程
纳米技术
光电子学
化学
冶金
有机化学
工程类
作者
Minglu Sun,Xing’an Dong,Ben Lei,Jieyuan Li,Peng Chen,Yuxin Zhang,Fan Dong
出处
期刊:Nanoscale
[Royal Society of Chemistry]
日期:2019-01-01
卷期号:11 (43): 20562-20570
被引量:44
摘要
In order to efficiently control air pollutants using photocatalytic technology, the co-generation of C-doping and oxygen vacancies (OVs) in Bi2WO6 (BWO) nanosheets was achieved by a graphene oxide (GO)-mediated hydrothermal method. The photocatalytic performance was highly improved with the synergistic effects of C-doping and OVs. The experimental characterization and DFT calculations were closely combined to reveal that the C element could serve as both an electron acceptor and channel for charge transfer to promote charge separation. Meanwhile, the OVs could induce the formation of a defect level in the band gap which increases the production of ˙OH as the primary reactive species by introducing more light-generated holes into the valence band. Meanwhile, the OVs could enhance the generation of ˙O2- species via the promotion of O2 adsorption and activation on the catalyst surface. Moreover, the reaction intermediates were monitored and the mechanism of photocatalytic NO oxidation was proposed based on in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The design concept of photocatalyst modification with C-doping and OVs could offer a novel strategy to enhance the performance for environmental applications.
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