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Two-dimensional porphyrin MOFs/TOAB modified electrode and preparation method and application thereof

A technology for modifying electrodes and porphyrins, which is applied to the electrochemical variables of materials, material analysis through electromagnetic means, and measuring devices, etc., to achieve good repeatability, fast and accurate detection methods, and good stability

Pending Publication Date: 2022-01-11
QINGDAO UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The inventor finds that the method for detecting luminol in the prior art is very rare, and it is necessary to develop a new detection method with high sensitivity, high stability and good luminol

Method used

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  • Two-dimensional porphyrin MOFs/TOAB modified electrode and preparation method and application thereof
  • Two-dimensional porphyrin MOFs/TOAB modified electrode and preparation method and application thereof
  • Two-dimensional porphyrin MOFs/TOAB modified electrode and preparation method and application thereof

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preparation example Construction

[0029] Wherein the preparation method of the porphyrin metal organic framework material is:

[0030] (1) Add copper nitrate trihydrate (II), trifluoroacetic acid and polyvinylpyrrolidone in the mixed solution of DMF and ethanol, add the porphyrin solution that is dissolved in the mixed solution of DMF and ethanol dropwise under stirring, the mixed solution is ultrasonically treatment to disperse evenly;

[0031] (2) Heating the mixed solution to 80° C. for 3 hours, washing the obtained red nanosheets with ethanol, and centrifuging to collect the product.

[0032] Preferably, the specific steps of step (1) are: in the mixed solution of 12mL DMF and ethanol (V:V=3:1), add copper (II) nitrate trihydrate (3.6mg, 0.015mmol), trifluoroacetic acid ( 1.0M, 10μL) and polyvinylpyrrolidone (10.0mg) were dissolved in a 20mL glass bottle; then porphyrin (4.0mg, 0.005 mmol) solution; after that, the mixed solution was ultrasonically treated for 10 minutes to make it uniformly dispersed. ...

Embodiment 1

[0049] like figure 1 As shown, the preparation process of the two-dimensional porphyrin MOFs / TOAB modified electrode is as follows:

[0050] (1) Preparation of two-dimensional porphyrin MOFs (2D MOFs):

[0051] Add copper(II) nitrate trihydrate (3.6mg, 0.015 mmol), trifluoroacetic acid (1.0M, 10μL) and polyvinylpyrrolidone (10.0mg ) was dissolved in a 20 mL glass bottle; then a solution of porphyrin (4.0 mg, 0.005 mmol) dissolved in 4 mL of DMF and ethanol (V:V=3:1) was added dropwise with stirring. After that, the mixed solution was ultrasonically treated for 10 minutes to make it uniformly dispersed;

[0052] The mixed solution was heated to 80° C. and kept under this condition for 3 hours, the resulting red nanosheets were washed twice with ethanol, and the product was collected by centrifugation at 8000 r / m for 10 minutes.

[0053] (2) Grind GCE on 0.1 and 0.03 μm alumina respectively until smooth, rinse with water and ethanol, and set aside;

[0054] (3) Prepare 1mg m...

Embodiment 2

[0058] like figure 1 As shown, the preparation process of the two-dimensional porphyrin MOFs / TOAB modified electrode is as follows:

[0059] (1) Preparation of two-dimensional porphyrin MOFs (2D MOFs):

[0060] Add copper(II) nitrate trihydrate (3.6mg, 0.015 mmol), trifluoroacetic acid (1.0M, 10μL) and polyvinylpyrrolidone (10.0mg ) was dissolved in a 20 mL glass bottle; then a solution of porphyrin (4.0 mg, 0.005 mmol) dissolved in 4 mL of DMF and ethanol (V:V=3:1) was added dropwise with stirring. After that, the mixed solution was ultrasonically treated for 10 minutes to make it uniformly dispersed;

[0061] The mixed solution was heated to 80° C. and kept under this condition for 3 hours, the resulting red nanosheets were washed twice with ethanol, and the product was collected by centrifugation at 8000 r / m for 10 minutes.

[0062] (2) Grind GCE on 0.1 and 0.03 μm alumina respectively until smooth, rinse with water and ethanol, and set aside;

[0063] (3) Prepare 1.2mg...

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Abstract

The invention relates to the technical field of optical / electrochemical analysis and detection, in particular to a two-dimensional porphyrin MOFs / TOAB modified electrode and a preparation method and application thereof. The modified electrode comprises a glassy carbon electrode, a two-dimensional porphyrin MOFs material on the surface of the electrode and tetraoctyl ammonium bromide on the surface of the porphyrin MOFs material; the preparation method of the two-dimensional porphyrin MOFs material comprises the following steps: (1) adding copper nitrate (II) trihydrate, trifluoroacetic acid and polyvinylpyrrolidone into a mixed solution of DMF (Dimethyl Formamide) and ethanol, dropwise adding a porphyrin solution dissolved in DMF and ethanol while stirring, and carrying out ultrasonic treatment on the mixed solution to uniformly disperse the mixed solution; and (2) heating the mixed solution to 80 DEG C, keeping the temperature for 3 hours, washing the obtained red nanosheet with ethanol, and centrifugally collecting the product. The modified electrode generates competitive catalytic reaction with lumilox in a water-phase electrolyte containing dissolved oxygen, the preparation is simple and convenient, and the modified electrode has the advantages of high sensitivity, large linear range, good stability and repeatability and the like when being used for detecting the lumilox.

Description

technical field [0001] The invention relates to the technical field of photo / electrochemical analysis and detection, in particular to a two-dimensional porphyrin MOFs / TOAB modified electrode and its preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily to be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Luminol, also known as luminol, is a pale yellow powder at room temperature and is a relatively stable synthetic organic compound with a chemical formula of C 8 h 7 N 3 o 2 . For blood that cannot be observed with the naked eye at the crime scene, the luminol reagent can show a very small amount of blood stains (occult blood reaction), this is because hemoglobin contains iron, and ...

Claims

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Application Information

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IPC IPC(8): G01N27/30
CPCG01N27/308
Inventor 张光耀李梦洁喻琨颜廷义曲丽君
Owner QINGDAO UNIV
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