Preparation and application of a dual-emission dye-coated lanthanide metal-organic framework

Abstract

The present invention relates to the preparation and application of a lanthanide metal-organic framework coated with a dual-emission dye. S1, selecting raw materials, rare earth terbium ions and trimesic acid; S2, stirring after dissolving trimesic acid in ethanol; S3, add 0.05M Tb(NO 3 ) 3 ·6H 2 O aqueous solution was stirred; S4, standing still, centrifuged to collect the white precipitate, and dried to obtain a white sample after washing; S5, the sample was soaked in dyes of different concentrations for processing; S6, the light yellow precipitate in the collection step S5 was processed. drying to obtain the lanthanide metal organic framework material; S7, detecting the obtained lanthanide metal organic framework material. The preparation of the double emission dye-coated lanthanide metal-organic framework is to use different concentrations of 7-diethylamino-4-methylcoumarin to coat the obtained metal-organic framework, so that it can be used at different pH values , environmental small molecules, more accurate detection of Pb in solvents 2+ The presence.

Description

technical field [0001] The invention relates to the technical field of frame preparation, in particular to the preparation and application of a lanthanide metal-organic frame coated with dual emission dyes. Background technique [0002] Pb2+ is a highly toxic heavy metal ion, which widely exists in daily life, such as automobile exhaust, cigarettes, lead paint, cosmetics and industrial waste water, etc., and poses a threat to human health and the environment even at low concentrations. Diseases related to Pb2+, such as memory loss, irritability, anemia, cardiovascular disease, developmental disorders, and new machine paralysis. Therefore, exploring a sensitive method to routinely and effectively detect Pb2+ is of great significance for clinical diagnosis and environmental monitoring. so far. Several analytical instruments have been reported for the detection of heavy metals. Inductively coupled plasma mass spectrometry (ICP-MS) is currently a powerful technique for Pb2+ d...

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Problems solved by technology

[0003] Lanthanide metal-organic frameworks, referred to as Ln-MOFs, not only have the porosity of MOFs materials, but also have their own optical properties, such as high color purity, color visible to the naked eye, long Stokes shift value, long fluorescence lifetime , these advantages are beneficial to their application in fluorescent probes, but some Ln-MOFs also have these problems as fluorescent probes. Most of the existing reported Ln-MOFs have a single light-emitting site, and the sensitivity is relatively low However, the fluorescence intensity of single-emission materials is easily affected by pH, small molecules in the environment, solvents, instruments, etc. The luminescence intensity is different under different conditions, and the detection results are not accurate. It is difficult to accurately detect Pb2+ ions in aqueous solution. exist

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