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Method for detecting phosphate ions based on dual-emission europium metal-organic framework materials

A metal-organic framework and phosphate ion technology, which is applied in the direction of luminescent materials, analytical materials, material excitation analysis, etc., can solve the problems of expensive, ineffective analysis and detection, lengthy sample pretreatment, etc., and achieve low detection limit, good Application value, visible effect of detection process

Inactive Publication Date: 2020-11-10
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been many literature reports for effective identification and determination of phosphate, but the methods usually require expensive equipment, time-consuming, lengthy sample pretreatment and operators with professional knowledge, which makes These methods cannot be effectively implemented for routine analytical detection

Method used

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  • Method for detecting phosphate ions based on dual-emission europium metal-organic framework materials
  • Method for detecting phosphate ions based on dual-emission europium metal-organic framework materials
  • Method for detecting phosphate ions based on dual-emission europium metal-organic framework materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Synthesis and Characterization of Dual-Emitting Lanthanide Europium Metal-Organic Frameworks

[0041] 20.04 mg, 0.05 mmol / L of Eu(Ac) 3 ·4H 2 A mixture of O and 8.7 mg, 0.05 mmol / L of terphenyl-3,4ʹʹ,5-tricarboxylic acid was stirred in a mixed solution of 2 mL of deionized water and 4 mL of DMF for 0.5 h, and then 5 μL of 2 mol / L was added. HNO 3 . Subsequently, the obtained solution was transferred to a stainless steel autoclave with a polytetrafluoroethylene liner, heated at 120 °C for 48 hours, and cooled to 25 °C after 20 hours to obtain colorless bulk crystals. Ionized water and ether were washed several times. based on ligand H 3 Yield of L: 39%. The theoretical value (%) of elemental analysis of C45H35Eu2NO16 is: C 47.01, H 3.07, N 1.22; the measured value (%) is: C 47.31, H 3.29, N 1.38; it shows that the elemental composition is basically consistent with the theoretical value.

[0042] The structure and properties of the metal-organic framework prepared ...

Embodiment 2

[0050] A method for detecting phosphate ions based on dual-emitting europium metal-organic framework materials:

[0051] (1) The prepared dual-emission europium metal-organic framework material was uniformly dispersed in an aqueous solution to prepare a suspension solution with a concentration of 85 mg / L as the detection system, and 250 nm was used as the excitation wavelength. Fluorescence emission peak;

[0052] (2) Add the solution to be tested into the detection system and mix it evenly, let it stand still to ensure the interaction between the analyte and the material, and examine the changes of the fluorescence emission intensity at 368 nm and 614 nm respectively; the anion refers to the : Phosphate ion;

[0053] The general chemical formula of the dual-emitting europium metal-organic framework material used is: [Eu 2 (L) 2 (H 2 O) 2 (DMF) 2 ], L is terphenyl-3,4ʹʹ,5-tricarboxylic acid, as ligand, Eu 3+ As a metal center, the crystal structure belongs to monoclinic...

Embodiment 3

[0056] Determination of UV Absorption Spectrum and Fluorescence Emission Spectrum of Metal-Organic Framework Materials Used

[0057] The metal-organic framework material prepared in the above-mentioned Example 1 was dispersed in an aqueous solution, and the ultraviolet-visible absorption spectrum and fluorescence emission spectrum of the material were tested, as shown in the appendix. image 3 shows a broad absorption peak at 320 nm in the UV-Vis absorption spectrum of metal-organic framework materials, which is attributed to jump. Under excitation light, the metal-organic frameworks exhibited ligand- and Eu-based structures at 368 nm and 592-698 nm. 3+ Sharp feature emission. In the spectral emission band in the range 592-698 nm, the emission maximum is located at 614 nm and is assigned to 5 D 0 → 7 F 2 The electronic transition of , the side peaks are located at 592 nm ( 5 D 0 → 7 F 1 ), 650 nm ( 5 D 0 → 7 F 3 ) and 698 nm ( 5 D 0 → 7 F 4 ) at. To develop...

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Abstract

The invention relates to a method for detecting phosphate ions based on a dual-emission europium metal organic framework material. The dual-emission lanthanide europium metal organic framework material is used as a ratio-type fluorescence probe for being applied to high-selectivity high-sensibility detection of the phosphate ions. The chemical general formula of the adopted dual-emission lanthanide europium metal organic framework material is [Eu2(L)2(H20)2(DMF)2], wherein a Eu2O2 cluster is used as an inorganic node, a rigid asymmetric tricarboxylic acid ligand terphenyl-3,4'',5-tricarboxylicacid (H3L) is used as an organic bridging ligand, and preparation is successfully conducted by means of a simple and convenient one-pot solvothermal technology. The invention further discloses application of the metal organic framework material in the aspect of selectively detecting phosphate anions. In a detecting process, along with increase of the content of the added phosphate anions, obviouscolor change from pink to purple which is easily observed with naked eyes is presented under radiation of an ultraviolet lamp, and thus the detecting process becomes more convenient and practical.

Description

[0001] This application is supported by the General Program 21375095 of the National Natural Science Foundation of China. technical field [0002] The invention belongs to the field of metal-organic framework material preparation and fluorescence sensing, in particular to a method for detecting phosphate ions based on a double-emission europium metal-organic framework material. Background technique [0003] Metal-organic frameworks (MOFs), as functional porous coordination polymer materials self-assembled with inorganic metal ions or metal clusters and multidentate organic ligands, have tunable channels. The excellent properties such as structure, huge specific surface area, controllable surface properties, good thermal and chemical stability, and abundant unsaturated sites have aroused great research interest. Among many metal-organic frameworks, lanthanide metal-organic frameworks (Ln-MOFs), which are constructed by the coordination of lanthanide ions and bridging organic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64C08G83/00C09K11/06
CPCC08G83/008C09K11/06C09K2211/182G01N21/6428
Inventor 李妍程月丁斌
Owner TIANJIN NORMAL UNIVERSITY
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