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

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 ineffective implementation of analysis and detection, expensive, lengthy sample pretreatment, etc., and achieve good application value and detection The effect of low limit and visible detection process

Inactive Publication Date: 2018-09-14
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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-cons

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

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

[0041] 20.04 mg, 0.05 mmol / L of Eu(Ac) 3 4H 2 O and 8.7 mg, 0.05 mmol / L of terphenyl-3,4ʹʹ,5-tricarboxylic acid mixture were stirred in 2 mL of deionized water and 4 mL of DMF for 0.5 hours, and then 5 μL of 2mol / L HNO 3 . Subsequently, the resulting 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 of cooling to obtain colorless blocky crystals. Washed several times with deionized water and ether. Based on ligand H 3 The yield of L: 39%. The theoretical value (%) of element 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; indicating that the elemental composition is basically consistent with the theoretical value.

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

Embodiment 2

[0050] A method for detecting phosphate ions based on dual-emission 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, and the test system was at 368 nm and 614 nm the fluorescence emission peak;

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

[0053] The general chemical formula of the double emission 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 a ligand, Eu 3+ As a metal center,...

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 Example 1 above was dispersed into an aqueous solution, and the ultraviolet-visible absorption spectrum and fluorescence emission spectrum of the material were tested, as shown in the attached image 3 As shown, there is a broad absorption peak at 320 nm in the UV-visible absorption spectrum of metal organic framework materials, which is attributed to jump. Under the excitation of excitation light, the metal-organic framework material exhibits ligand-based and Eu-based 3+ The sharp features of the emission. In the spectral emission band in the range 592-698 nm, the emission maximum is located at 614 nm, 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 ) place. ...

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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 funded by the General Project 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, and in particular relates to a method for detecting phosphate ions based on double emission europium metal organic framework material. Background technique [0003] Metal-organic frameworks (MOFs), as a functional porous coordination polymer material self-assembled by inorganic metal ions or metal clusters and multi-dentate organic ligands, have tunable channels 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 coordinated by lanthanide ions and bridging organic ligands, are due t...

Claims

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Application Information

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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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