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Toluidine blue modified metal organic framework electrode and preparation method and application thereof

A technology of metal-organic framework and toluidine blue, which is applied in electrolytic organic material coating, material electrochemical variable, material analysis through electromagnetic means, etc., can solve the problems of high raw material price and high detection limit, and achieve simple method and electrochemical Good performance and low cost

Pending Publication Date: 2021-06-04
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lower detection limit of the above-mentioned electrochemical immunosensor to IAA is relatively high, and the raw material price is relatively high.

Method used

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  • Toluidine blue modified metal organic framework electrode and preparation method and application thereof
  • Toluidine blue modified metal organic framework electrode and preparation method and application thereof
  • Toluidine blue modified metal organic framework electrode and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]Dissolve 0.266 g of zinc nitrate hexahydrate (0.0009 mol) in 3 mL of distilled water to obtain a 0.089 g / mol zinc nitrate aqueous solution, and add 0.0303 g of potassium nitrate (0.0003 mol) as a supporting electrolyte. Dissolve 0.105 g of trimesic acid (0.0005 mol) in 3 mL of ethanol, add the resulting 0.035 g / mL trimesic acid ethanol solution into zinc nitrate aqueous solution and mix well, add 300 µL of 0.025 mol / L toluidine blue The aqueous solution was stirred at room temperature at a speed of 400 r / min for 3 hours to obtain an electrodeposition solution. The toluidine blue aqueous solution is prepared by dissolving toluidine blue in 0.1mol / L nitric acid.

[0042] Glassy carbon electrodes (GCE for short) with a radius of 3 mm were ground and polished successively in 0.5 and 0.05 µm alumina suspensions, the electrode surface was cleaned with ultrapure water, and ultrasonic waves were used for 3 times in ultrapure water, ethanol, and ultrapure water respectively. min...

Embodiment 2

[0050] Dissolve 0.5 g of zinc nitrate hexahydrate (0.0017 mol) in 5 mL of distilled water to obtain a 0.1 g / mol zinc nitrate aqueous solution, and add 0.0303 g of potassium nitrate (0.0003 mol) as a supporting electrolyte. Dissolve 0.2 g of trimesic acid (0.0010 mol) in 5 mL of ethanol, and add the obtained 0.04 g / mL trimesic acid ethanol solution into the zinc nitrate aqueous solution and mix well, add 500 µL of 0.02 mol / L toluidine The blue aqueous solution was stirred at room temperature at a speed of 350 r / min for 3.5 h to obtain an electrodeposition solution. The toluidine blue aqueous solution is prepared by dissolving toluidine blue in 0.5mol / L nitric acid.

[0051] A glassy carbon electrode (GCE) with a radius of 2 mm was ground and polished successively in 1.0 µm and 0.05 µm alumina suspensions, the surface of the electrode was cleaned with ultrapure water, and ultrasonic waves were used in ultrapure water, ethanol, and ultrapure water for 2 min to remove residual al...

Embodiment 3

[0055] Dissolve 0.8 g of zinc nitrate hexahydrate (0.0027 mol) in 5 mL of distilled water to obtain a 0.16 g / mol zinc nitrate aqueous solution, and add 0.0606 g of potassium nitrate (0.0006 mol) as a supporting electrolyte. Dissolve 0.5 g of trimesic acid (0.0024 mol) in 5 mL of ethanol, and add the obtained 0.1 g / mL trimesic acid ethanol solution into the zinc nitrate aqueous solution and mix well, add 600 µL of 0.025 mol / L toluidine The blue aqueous solution was stirred at room temperature at a speed of 500 r / min for 2.5 h to obtain an electrodeposition solution. The toluidine blue aqueous solution is prepared by dissolving toluidine blue in 0.2mol / L nitric acid.

[0056] A glassy carbon electrode (GCE) with a radius of 2 mm was ground and polished successively in 1.0 µm and 0.03 µm alumina suspensions, the surface of the electrode was cleaned with ultrapure water, and ultrasonic waves were used in ultrapure water, ethanol, and ultrapure water for 5 min to remove residual a...

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Abstract

The invention discloses a toluidine blue modified metal organic framework electrode and a preparation method and application thereof. The surface of the electrode is provided with an electrochemical signal molecule toluidine blue modified metal organic framework structure, the electrochemical performance is good, and the electrode is prepared through a one-step in-situ electrodeposition method. The method is applied to electrochemical immunosensing, the method is simple, the cost is low, when the IAA concentration is detected, the detection limit is as low as 1.2 pg / mL, and the linear range of the electrochemical response intensity and the IAA concentration is 20 pg / mL and 20 ng / mL.

Description

technical field [0001] The invention relates to an electrode and its preparation method and application, especially a metal organic framework electrode and its preparation method and application. Background technique [0002] Metal-organic frameworks (MOFs for short), also known as porous coordination polymers, are a new generation of crystalline materials. This type of material is usually a periodic solid material with a complex network structure formed by self-assembly of organic bridging ligands and metal ions or metal clusters through coordination bonds, hydrogen bonds, electrostatic interactions, etc. Metal-organic framework materials have adjustable structure, easy modification, large specific surface area, and various physical and chemical properties, such as topology, magnetism, catalysis, fluorescence, etc., and can be widely used in selective catalysis, gas adsorption and separation, Biochemical sensing, drug delivery, immobilized active small molecules, molecular...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/36G01N27/327G01N33/74C25D9/02
CPCG01N27/308G01N27/36G01N27/3277G01N33/74C25D9/02
Inventor 覃晓丽唐带丽许思宇苏招红蒋红梅程永兵
Owner HUNAN AGRICULTURAL UNIV
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