Ultrathin bismuth oxyhalides solid solution nanosheets with oxygen vacancies for enhanced selective photocatalytic NO removal process

摘要

Photocatalytic NO removal is an oxidation reaction where the NO_2 or NO_3~- can be generated during the selective or nonselective NO removal process. For enhanced photocatalytic NO removal ability, photocatalysts were required stronger molecular oxygen activation activity for stronger oxidizability. Solid solution structure is confirmed as an efficient strategy to achieve induced molecular oxygen activation capacity. In this work, ultrathin structural BiOBr_(0.5)I_(0.5) with oxygen vacancies (BiOBr_(0 5)I_(0.5)-U) was prepared and it showed obvious enhanced photocatalytic efficiency for NO removal than unmodified BiOBr_(0.5)I_(0.5). The photocatalytic NO removal mechanism was confirmed through efficient methods. The enhanced generation ability for superoxide and singlet oxygen due to the ultrathin structure of BiOBr_(0.5)I_(0.5)-U was confirmed evidentially. The improved molecular oxygen activation activity supported the improved selective NO removal efficiency. This study could provide a new thought for the design of efficient bismuth oxyhalide photocatalysts for NO removal.