Dye@MOF composites(RhB@1): Highly sensitive dual emission sensor for the detection of pesticides, Fe^(3+) and ascorbate acid  

作　　者：Lu Liu Xiao-Li Chen Miao Cai Rui-Kui Yan Hua-Li Cui Hua Yang Ji-Jiang Wang 

机构地区：[1]School of Chemistry and Chemical Engineering,Shaanxi Key Laboratory of Chemical Reaction Engineering,Laboratory of New Energy and New Function Materials,Yan’an University,Yan’an 716000,China

出　　处：《Chinese Chemical Letters》2023年第10期121-125,共5页中国化学快报（英文版）

基　　金：supported by National Natural Science Foundation of China(No.21763028);Science and Technology project of Shaanxi Province(Nos.2022NY-071,2022QFY07-05,2022JZ-49)。

摘　　要：With the rapid development of economy, industrial and agricultural pollutants have caused great damage to the ecological environment and the normal development of organisms, posing a serious threat to global public health. Therefore, rapid and sensitive detection of pollutants is very important for environmental safety and people’s health. A stable multi-response fluorescence sensor(RhB@1) with dual emission characteristics was constructed by embedding Rh B guest molecules in Zn-MOF using a simple one-pot method. XRD, IR, XPS, Raman and other characterization methods were used to demonstrate the formation of composite materials. The sensor has two fluorescence emission peaks at 415 nm and 575nm under the excitation of 316 nm. It has high sensitivity and low detection limit(7.94 and 7.82 nmol/L,respectively) in the detection of fluazinam(FLU) and Fe^(3+). The mechanism of fluorescence quenching may be due to the synergistic effect of IFE and PET. Outstandingly, when ascorbate acid(AA) was added to the quenching system of Fe^(3+) and Rh B@1, its fluorescence gradually recovered, forming the unique“on-off-on” sensor. Therefore, RhB@1 has a fast fluorescence response and good stability, making it potentially useful in practical application and biosensors. More significantly, using Fe^(3+)and AA as chemical input signals, a binary intelligent logic gate device has been developed based on the “on-off-on” response mode of RhB@1, which extends the application of logic gate switching devices in the chemical field. In addition, a visual portable test paper with good selectivity and high sensitivity was developed, which can be used for rapid detection of FLU, showing its broad application prospect.

关 键 词：Metal-organic framework Rhodamine B PESTICIDES Fe^(3+) Ascorbate acid Fluorescence sensing 

分 类 号：X830[环境科学与工程—环境工程] O657.3[理学—分析化学] TP212[理学—化学]