期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 310, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.127819
关键词
2D MOF nanosheet; Calix[4]arene; Pesticide; Host-guest chemistry; Fluorescence sensor
资金
- National Natural Science Foundation of China [21401006, 21771097, U1304210]
Chemical pesticides are highly toxic and widely spread as environmental pollutants. New strategies are being developed to selectively and sensitively detect pesticides. Herein, we prepared ultrathin two-dimensional (2D) metal-organic framework (MOF) nanosheets, decorated with tetra-pyridyl calix[4]arene, for determination of pesticide based on host-guest chemistry. The 3D layered MOF {[Cd-2(5-NO2-BDC)(2)L(MeOH)]center dot 2MeOH}(n) (MOF-Calix; 5-NO2-H2BDC = 5-nitro-1,3-benzenedicarboxylic acid; L = 25,26,27,28-tetra-[(4-pyridylmethyl)oxy] calix[4]arene) was elaborately constructed, with features of 2D layered structure that are held together by weak pi...pi interactions. Due to the cup-shaped characteristic of calix[4]arene ligand and easy-to-departure MeOH molecules in the interspaces of the 2D layers in MOF-Calix, the 3D bulk MOF-Calix can be readily exfoliated into ultrathin single (2.20 nm) or double-layer (3.73 nm) of 2D nanosheets by ultrasound method with high efficiency. We take the intrinsic advantages of calix[4]arene and the highly accessible active site of calix[4]arene on the surface of the 2D MOF-Calix nanosheets for selective and sensitive sensing of glyphosate via fluorescence enhancement effect with a detection limit of 2.25 mu M. This work demonstrates the simple preparation of a 2D MOF nanosheet as fluorescent sensor for glyphosate detection.
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