Probing reaction pathways for H_(2)O-mediated HCHO photooxidation at room temperature

作     者：Weiwei Shao Xiaodong Li Xiaolong Zu Liang Liang Yang Pan Junfa Zhu Chengming Wang Yongfu Sun Yi Xie Weiwei Shao;Xiaodong Li;Xiaolong Zu;Liang Liang;Yang Pan;Junfa Zhu;Chengming Wang;Yongfu Sun;Yi Xie

作者机构：Hefei National Laboratory for Physical Sciences at MicroscaleNational Synchrotron Radiation LaboratoryHefei Science Center of CASUniversity of Science and Technology of ChinaHefei230026China Institute of EnergyHefei Comprehensive National Science CenterHefei230031China 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2021年第14卷第5期

页      面：1471-1478页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：This work was financially supported by National Key R&D Program of China(Nos.2019YFA0210004 and 2017YFA0207301) the National Natural Science Foundation of China(Nos.21975242 and 21890754) the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDB36000000) Youth Innovation Promotion Association of CAS(No.CX2340007003) Major Program of Development Foundation of Hefei Center for Physical Science and Technology(No.2020HSC-CIP003) Key Research Program of Frontier Sciences of CAS(No.QYZDYSSW-SLH011) the Fok Ying-Tong Education Foundation(No.161012) Supercomputing USTC and National Supercomputing Center in Shenzhen are acknowledged for computational support 

主　　题：mechanistic study H_(2)O-mediated HCHO photooxidation room temperature 

摘      要：Photooxidation provides a promising strategy for removing the dominant indoor pollutant of HCHO,while the underlying photooxidation mechanism is still unclear,especially the exact role of H2O ***,we utilize in-situ spectral techniques to unveil the H2O-mediated HCHO photooxidation *** an example,the synthetic defective Bi2WO6 ultrathin sheets realize high-rate HCHO photooxidation with the assistance of H2O at room ***-situ electron paramagnetic resonance spectroscopy demonstrates the existence of•OH radicals,possibly stemmed from H2O oxidation by the photoexcited ***-radiation vacuum ultraviolet photoionization mass spectroscopy and H218O isotope-labeling experiment directly evidence the formed•OH radicals as the source of oxygen atoms,trigger HCHO photooxidation to produce CO2,while in-situ Fourier transform infrared spectroscopy discloses the HCOO*radical is the main photooxidation ***-functional-theory calculations further reveal the•OH formation process is the rate-limiting step,strongly verifying the critical role of H2O in promoting HCHO *** work first clearly uncovers the H2O-mediated HCHO photooxidation mechanism,holding promise for high-efficiency indoor HCHO removal at ambient conditions.