期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 281, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119481
关键词
Bismuth-based photocatalysts; Oxygen vacancy; Bi(0)nanoparticles; NO removal; ohmic contact
资金
- National Natural Science Foundation of China [51772183]
- key Research and Development Program of Shaanxi Province [2018ZDCXL-SF02-04]
- Fundamental Research Funds for the Central Universities [GK201903023, GK201801005]
The study proposes a N-2-assisted thermal treatment method for in-situ formation of oxygen vacancies (OVs)-rich Bi-0/Bi-based photocatalysts, clarifying the mechanisms of Bi-0 nanoparticles synthesis and OVs generation. Among the synthesized photocatalysts, Bi-0/OVs-(BiO)2CO3 exhibits the best photocatalytic activity and stability for NO photo-oxidative removal, with the mechanism showing the importance of center dot O-2(-) and center dot OH species in the process.
In this study, a N-2-assisted thermal treatment method is proposed for in-situ formation of a series of oxygen vacancies (OVs)-rich Bi-0/Bi-based photocatalysts, including OVs-(BiO)(2)CO3, Bi-0/OVs-(BiO)(2)CO3, Bi-0/OVs(BiO)(2)CO3/beta-Bi2O3, Bi-0/OVs-beta-Bi2O3, Bi-0/OVs-beta-Bi2O3/alpha-Bi2O3 and Bi-0/alpha-Bi2O3. Mechanisms of in-situ formation of Bi-0 nanoparticles and generation of OVs in Bi-based photocatalysts are clarified. Apart from their contribution to the effective separation of photogenerated charge carriers and enhancement of light absorption, the effects of Bi-0 nanoparticles and OVs on selective photocatalytic oxidation of NO are also investigated. Among the synthesized Bi-based photocatalysts, Bi-0/OVs-(BiO)(2)CO3 shows the best photocatalytic activity and stability for photo-oxidative removal of NO. The systematic study of photocatalytic mechanism demonstrated that the Ohmic contact between OVs-(BiO)(2)CO3 and Bi-0 gradually promote the formation of center dot O-2(-) and center dot OH species. It is found that center dot O-2(-) plays an important role in the photocatalytic NO removal process, while center dot OH species can effectively inhibit the formation of NO2 during the NO removal process. The new approach demonstrated in this study can be applied for the in-situ formation of wide-solar-spectrum-responsive photocatalysts with efficient photo catalytic activity.
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