功能化MIL-101(Cr)修饰QCM气相传感器的组装与甲酸识别OA北大核心CSTPCD

Volatile organic compounds(VOCs)are considered as one of the major components in atmospheric pollutants,and pose serious hazards to both human health and the environment.It is urgent to develop new high-efficient detection techniques for VOCs.In this work,ethylenediamine(ED)and ethanolamine(EA)were grafted into MIL-101(Cr)to obtain ED-and EA-derived MIL-101(Cr)materials[labeled as MIL-101(Cr)-ED and MIL-101(Cr)-EA],respectively.Then,these three MIL-101(Cr)materials were loaded on the surface of quartz crystal through dip coating to assemble three kinds of MIL-101(Cr)-modified quartz crystal microbalance(QCM)gas sensors,respectively.Moreover,the sensing and recognition performance of these QCM sensors toward methanol,ethanol,2-propanol,acetone,cyclohexane,diethylamine,formic acid,formaldehyde,ammonia,and acetic acid were studied in detail.As indicated,MIL-101(Cr)-ED-and MIL-101(Cr)-EA-loaded QCM sensors showed better sensing performance for formic acid in comparison with the original MIL-101(Cr)-based sensor,and the oscillation frequency of these two sensors decreased by-375.6 and-232.1 Hz when the concentration of formic acid was 350 mg/L,respectively.Δf value was linearly related to the concentration of formic acid in the range of 5-350 mg/L.In addition,the sensitivity of MIL-101(Cr)-ED-loaded QCM gas sensor was estimated to be 0.95 Hz·L·mg-1 and the limit of detection was 0.95 mg/L.As a result,this MIL-101(Cr)-modified QCM gas sensor demonstrated high sensitivity,low detection limit,and good repeatability.In brief,this research would provide some useful information for developing new QCM gas sensors in real-time VOCs detection.