期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 243, 期 -, 页码 322-329出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2018.10.037
关键词
NO removal; Ultrathin structure; BiOBr/BiOI; NO3- adsorption; Photocatalytic mechanism
资金
- National Natural Science Foundation of China [51872147, 51502146,51702270, 21671113]
- Program for Innovative Research Team of Science and Technology in the University of Henan Province [19IRTSTHN025]
- Petro China Innovation Foundation [2018D-5007-0604]
Improved photocatalytic NO removal of photocatalysts requires enhanced carrier photocatalysis for more reactive species generation. Ultrathin structural BiOBr/BiOI (BiOBr/BiOI-U) photocatalyst was in-situ prepared and it showed enhanced photocatalytic efficiency for NO removal. The underlying photocatalytic process is divided into two steps: in the first step, NO3- was produced in a nonselective oxidation process. The increased NO3- concentration induces NO3- adsorption on the surface oxygen vacancies of the photocatalyst in the second step, which changed the surface environment of the ultrathin BiOBr/BiOI photocatalyst. During this process, the nonselective oxidation process turned into a selective oxidation process with NO2 as the main product. In addition, the main photogenerated reactive oxygen species contributed to NO removal. Furthermore, the photo catalytic mechanism of BiOBr/BiOI-U was explored.
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