单线态氧
异质结
光催化
铋
氧化物
氧气
超氧化物
活性氧
化学
吸附
光化学
材料科学
放热反应
无机化学
催化作用
物理化学
有机化学
光电子学
生物化学
酶
作者
Xianfeng Yang,Xing Ding,Shengyao Wang,Jin Mao,Long Cheng,Peiwu Li,Hao Chen
标识
DOI:10.1016/j.jcis.2022.03.014
摘要
Establishing an ideal photocatalytic system with efficient reactive oxygen species (ROS) generation has been regarded as the linchpin for realizing efficient nitric oxide (NO) removal and unveiling the ROS-mediated mechanism. In this work, a novel oxygen-deficient 0D/1D Bi3.64Mo0.36O6.55/Bi2MoO6 heterojunctions (BMO-12-H) were successfully synthesized under the enlightenment of clarified crystal growth mechanism of bismuth molybdates. Because of the synergies between defect-engineering and heterojunction-construction, BMO-12-H demonstrated improved photoelectrochemical properties and O2 adsorption capacity, which in turn facilitated the ROS generation and conversion. The enhancement of •O2- and 1O2 endowed BMO-12-H with strengthened NO removal efficiency (59%) with a rate constant of 12.6*10-2 min-1. A conceivable NO removal mechanism dominated by •O2- and 1O2 was proposed and verified based on the theoretical calculations and in-situ infrared spectroscopy tests, where hazardous NO was oxidized following two different exothermic pathways: the •O2--induced NO → NO3- process and the 1O2-induced NO → NO2 → NO3- process. This work offers a basic guideline for accelerating ROS generation by integrating defect-engineering and heterojunction-construction, and provides new insights into the mechanism of efficient NO removal dominated by •O2- and 1O2.
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