Hydrogen Peroxide Heterolytic Cleavage Induced Gas Phase Photo-Fenton Oxidation of Nitric Oxide
Xiaoyan Liu, Shuangjun Li, Zhouhong Ren, Haiyan Cao, Qingyu Yang, Zhuyu Luo, Linfeng He, Jinpeng Zhao, Qing Wang, Guisheng Li, Xi Liu, Liwei Chen, Hexing Li, Dieqing Zhang
Abstract
Nitric oxide (NO) is one of the major air pollutants that may cause ecological imbalance and severe human disease. However, the removal of NO faces challenges of low efficiency, high energy consumption, and production of toxic NO 2 byproducts. Herein, we report an efficient *OOH intermediate-involved NO oxidation route with high NO 3 – selectivity via a gas phase photo-Fenton system. Fe single atoms (Fe SAs)-anchored NH 2 -UiO-66(Zr) (Fe SAs@NU) was synthesized. The five-coordinated Fe SAs undergo a transient structure reconstitution during the photo-Fenton process, which enables a novel heterolytic cleavage pathway of H 2 O 2 to derive specific ·OOH/·O 2 – radicals as reactive oxygen species. Therefore, a high NO (550 parts per billion) removal rate of 81% (NO 3 – selectivity up to 99%) is achieved under visible-light irradiation (>420 nm). This study provides new insight for the high-performance photo-Fenton process via a transient structure reconstitution pathway for the removal of gas phase NO x pollutants.