Singlet Oxygen and Mobile Hydroxyl Radicals Co-operating on Gas-Solid Catalytic Reaction Interfaces for Deeply Oxidizing NO x .
Qian LiJingjing ZhaoHuan ShangZhong MaHaiyan CaoYue ZhouGuisheng LiDieqing ZhangHexing LiPublished in: Environmental science & technology (2022)
Learning from the important role of porphyrin-based chromophores in natural photosynthesis, a bionic photocatalytic system based on tetrakis (4-carboxyphenyl) porphyrin-coupled TiO 2 was designed for photo-induced treating low-concentration NO x indoor gas (550 parts per billion), achieving a high NO removal rate of 91% and a long stability under visible-light (λ ≥ 420 nm) irradiation. Besides the great contribution of the conventional • O 2 - reactive species, a synergic effect between a singlet oxygen ( 1 O 2 ) and mobile hydroxyl radicals ( • OH f ) was first illustrated for removing NO x indoor gas ( 1 O 2 + 2NO → 2NO 2 , NO 2 + • OH f → HNO 3 ), inhibiting the production of the byproducts of NO 2 . This work is helpful for understanding the surface mechanism of photocatalytic NO x oxidation and provides a new perspective for the development of highly efficient air purification systems.
Keyphrases
- visible light
- highly efficient
- photodynamic therapy
- room temperature
- electron transfer
- energy transfer
- air pollution
- particulate matter
- carbon dioxide
- high glucose
- signaling pathway
- metal organic framework
- diabetic rats
- drug induced
- radiation therapy
- radiation induced
- endothelial cells
- ionic liquid
- genetic diversity
- reduced graphene oxide