Reduced graphene oxide @ZIF-8 composite-modified electrode and preparing method and detection application thereof

A technology for modifying electrodes and composite materials. It is applied in the fields of electrochemical variables of materials, analysis of materials, and material analysis by electromagnetic means. It can solve the problems of limited application performance and achieve the effect of simple preparation method and uniform particle size.

Active Publication Date: 2019-11-05
青岛鸿硅高沃新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application performance of GO is limited, because the material will aggregate through strong mutual stacking, and even re-stack to form graphite. In order to improve the electrochemical catalytic performance of GO, researchers usually reduce it to reduced graphene oxide. (RGO) can also be combined with other materials to increase its specific surface area and fully expose its catalytic sites

Method used

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  • Reduced graphene oxide @ZIF-8 composite-modified electrode and preparing method and detection application thereof
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  • Reduced graphene oxide @ZIF-8 composite-modified electrode and preparing method and detection application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (a) Preparation of RGO@ZIF-8

[0027]Graphene oxide GO was prepared into an aqueous dispersion with a concentration of 1 mg / mL by ultrasonic dispersion method, and 20 mL of the above GO aqueous dispersion was pipetted into a beaker, 0.595 g of zinc nitrate was weighed and dissolved in it, and then a certain amount of agar powder was added to make The final mass concentration is 0.5%, heat and stir until the agar powder is completely dissolved, add 30mL N,N-dimethylformamide and continue stirring for 30min, pipette a certain volume of the above mixed solution into a 12mm×100mm cylindrical plastic tube while it is hot , make it reach two-thirds of the height of the plastic tube, make 6 plastic tubes in parallel, then seal it with a parafilm and let it stand for reaction at room temperature for 2 hours. After the agar is completely gelled, a gray-black gel is obtained; 3. Dissolve 284g of 2-methylimidazole in a mixed solvent of water and N,N-dimethylformamide with a volume...

Embodiment 2

[0031] (a) Preparation of RGO@ZIF-8

[0032] According to the operating procedure in step (a) in Example 1, only the pipetting volume of the GO aqueous dispersion was changed to 30mL, and the other preparation methods and conditions were the same;

[0033] (b) Preparation of RGO@ZIF-8 composite membrane modified GCE

[0034] According to the operating procedure in step (b) in Example 1, ultrasonically disperse the No. 2 sample of RGO@ZIF-8 composite material prepared in step (a) in deionized water to prepare a dispersion with a concentration of 1 mg / mL, and take 7 μL of the dispersion liquid was drop-coated on the surface of the treated GCE, and after natural drying at room temperature, the RGO@ZIF-8 composite film modified GCE was obtained.

Embodiment 3

[0036] (a) Preparation of RGO@ZIF-8

[0037] Prepared according to the method and conditions of step (a) in Example 1;

[0038] (b) Preparation of RGO@ZIF-8 composite membrane modified GCE

[0039] Grind and polish the base electrode into a mirror surface, then ultrasonically clean it with ultrapure water, and dry it naturally at room temperature to obtain the processed GCE; ultrasonically disperse the No. 2 sample of RGO@ZIF-8 composite material prepared in step (a) in deionized water , to prepare a dispersion solution with a concentration of 1 mg / mL, take 5 μL of the dispersion solution and drop-coat it on the surface of the treated GCE, and dry it naturally at room temperature to obtain the RGO@ZIF-8 composite membrane modified GCE.

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Abstract

The invention discloses a reduced graphene oxide @ZIF-8 composite-film-modified electrode, a preparing method thereof and application of the electrode in simultaneously detecting naphthol isomers. According to the preparing method, a 2-methylimidazole solution is added into a reaction tube containing a graphene oxide agar gel matrix, a natural diffusion and penetration method is adopted for preparing a graphene oxide @ZIF-8 nano-compound, then a sample is divided into three layers according to the diffusion depth, afterwards, thermal reduction is conducted to prepare a reduced graphene oxide @ZIF-8 nano-compound, and then the corresponding modified electrode is prepared. The obtained modified electrode has the advantages of large effective area, many active sites, good dispersity and the like. Reduced graphene oxide and ZIF-8 overcome mutual defects, the synergistic effects of the reduced graphene oxide and ZIF-8 in the aspect of improving direct electrochemistry and electro-catalyticperformance are achieved, and the conductivity and catalytic performance of the modified electrode are improved. The obtained modified electrode simultaneously detects the high sensitivity of the naphthol isomers and has the advantages of being low in detection limit, wide in detection range, high in response speed and the like.

Description

Technical field: [0001] The invention relates to a reduced graphene oxide@ZIF-8 composite film modified electrode; the invention also relates to a preparation method of the modified electrode and its application in electrochemical sensing and detection. Background technique: [0002] Naphthol is an important organic chemical raw material and dye intermediate in chemical production in today's society. It is widely used in organic dyes, organic pigments, pesticides and medicines. Naphthol has two isomers, namely α-naphthol and β-naphthol. Since the two often coexist in the environmental system and have high toxicity at low concentrations, it is particularly important to establish a detection method with good stability and high sensitivity. At present, the methods for detecting such substances mainly include high performance liquid chromatography, gas chromatography, spectrophotometry, fluorescence method, electrochemiluminescence method, etc. However, these methods have disad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/308G01N27/48
Inventor 詹天荣周长志刘颖谭磊王海燕王磊
Owner 青岛鸿硅高沃新材料科技有限公司
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