In-situ fabrication of TiO_(2)/NH_(2)-MIL-125(Ti) via MOF-driven strategy to promote efficient interfacial effects for enhancing photocatalytic NO removal activity  

作　　者：Maosen Xu Pengfei Zhu Qinghong Cai Meichun Bu Chenghua Zhang Hong Wu Youzhou He Min Fu Siqi Li Xingyan Liu 

机构地区：[1]Chongqing Key Laboratory of Catalysis and New Environmental Materials,College of Environment and Resources,Chongqing Technology and Business University,Chongqing400067,China [2]School of Pharmacy,North Sichuan Medical College,Nanchong 637100,China [3]State Key Joint Laboratory of Environment Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing 100084,China

出　　处：《Chinese Chemical Letters》2024年第10期389-393,共5页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.22001026);Graduate Innovation Program of Chongqing Technology and Business University(No.yjscxx2023–211–38);Student Science and Technology Innovation Fund Project of Chongqing Technology and Business University(Nos.223006,233012)。

摘　　要：Deep oxidation of NO molecules to nitrate species by photocatalysis with virtually no toxic byproduct NO_(2)generation is a challenging task.In this study,Ti O_(2)in-situ grows based on NH_(2)-MIL-125(Ti)(NM-125)not only inhibited TiO 2agglomeration,but also contacted more tightly to obtain efficient interfacial effects,thus displaying excellent photocatalytic NO removal activity(68.08%).The formation of Ti O_(2) is directly confirmed by characterizations such as X-ray diffraction(XRD),transmission electron microscope(TEM),X-ray photoelectron spectroscopy(XPS).Meanwhile,UV–vis,photoluminescence,and photoelectrochemical analysis indicate that TiO_(2) formation effectively improves the optical properties.Moreover,the strong electron interaction and electron transport direction between NM-125 and Ti O_(2) are investigated by density functional theoretical(DFT)calculation.Finally,combined with the results of electron spin resonance(ESR)and in-situ FT-IR test,the intermediate processes of NO adsorption and photocatalytic oxidation reaction are discussed in depth,where the production of reactive oxygen species(ROS)under light is the key factor in the successful degradation of NO.Compared with NM-125 which can only produce·OH through photogenerated electrons since the lower valence band position,NMT-2 can directly produce·OH through photogenerated holes,thereby relieving the pressure on photogenerated electrons and producing more ROS.This study will provide reasonable guidance for the modification of NM-125 for photocatalytic removal of ppb-level NO.

关 键 词：PHOTOCATALYSIS NH_(2)-MIL-125(Ti) TiO_(2) No removal ROS 

分 类 号：X51[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]