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Bifunctional catalyst as well as preparation and application thereof

A bifunctional catalyst and reaction technology, applied in the direction of electrochemical variables of materials, instruments, measuring devices, etc., can solve the problems of electrochemical quantitative detection and low detection limit of only one substance detected by modified electrodes, and achieve storage stability. Good results with low detection limit and high sensitivity

Active Publication Date: 2020-06-12
HENGYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The primary technical problem to be solved by the present invention is to provide a A bifunctional catalyst that can be used for both hydrogen peroxide and levodopa detection, the modified electrode prepared from this material has a lower detection limit for the detection of hydrogen peroxide and levodopa

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  • Bifunctional catalyst as well as preparation and application thereof
  • Bifunctional catalyst as well as preparation and application thereof
  • Bifunctional catalyst as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The preparation of embodiment 1 bifunctional catalyst

[0044] (1) The quality of the three reactants weighed is specifically: weigh 0.1245g Co(CH 3 OO) 2 4H 2 O, 0.062g Ni(CH 3 OO) 2 4H 2 O and 0.114g CH 4 N 2 S in a 50mL beaker;

[0045] (2) The specific preparation method of the reaction solvent is as follows: respectively pipette 8 mL of N,N-dimethylformamide solvent and 8 mL of deionized water into the above-mentioned beaker and stir with a glass rod for 10 minutes to dissolve the reactants;

[0046] (3) The specific method of the reaction step is: move the reaction mixture solution to a 25mL polytetrafluoroethylene autoclave, seal the autoclave and place it in an oven at 200°C for 12 hours of uninterrupted reaction. Wash each with deionized water three times, and use a centrifuge to centrifuge at a speed of 4000r / min to obtain the product. The bifunctional catalyst is obtained. The catalyst is NiCo 2 S 4 / Co 9 S 8 Composition of composite component mat...

Embodiment 2

[0062] Example 2 Preparation of Bifunctional Catalyst Modified Electrode

[0063] (1) Take a glassy carbon electrode with a diameter of 3 mm, wash the glassy carbon electrode with clear water, and in the presence of an appropriate amount of Al with a particle size of 0.05 μm 2 o 3 The powder is ground in a figure 8 manner, polished 50 times, washed with deionized water, then ultrasonically washed with dilute nitric acid, acetone and deionized water, and dried under infrared light to obtain pretreated glassy carbon electrode;

[0064] (2) Get 2mg of the bifunctional catalyst described in Example 1 and disperse it in 2mL Nafion solution by ultrasonic for 20min to obtain the electrode material modification solution. The Nafion solution is dissolved in ethanol and water by Nafion117 film containing 5% (mass percentage) Formed in the mixed solvent (the mass ratio of ethanol and water is 90:10);

[0065] (3) Take 5 μL of the electrode material modification solution and apply it o...

Embodiment 3

[0067] Example 3 Detection Performance of Bifunctional Catalyst Modified Electrode

[0068] In this example, each modified electrode prepared in Example 2 was used as the experimental object, and a three-electrode system was formed with it, a platinum auxiliary electrode, and a saturated calomel reference electrode, and it was connected to a CHI660 electrochemical workstation (Shanghai Chenhua Instrument Co., Ltd.) Electrochemical performance testing.

[0069] (1) Comparison of electrocatalytic oxidation performance of different electrodes for hydrogen peroxide electrocatalytic reduction and levodopa

[0070] In order to more intuitively reflect the electrocatalytic reduction performance of the bifunctional catalyst-modified electrode prepared by the present invention to hydrogen peroxide and the electrocatalytic oxidation performance of levodopa, the glassy carbon electrode (a), the solid microsphere catalyst-modified electrode ( b), flower-shaped microsphere catalyst modifi...

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Abstract

The invention discloses a bifunctional catalyst as well as a preparation method and application thereof. The preparation method of the bifunctional catalyst comprises the following steps: (1) weighingthe following reactants by mass: 0.1 to 0.2 g of Co (CH3OO) 2.4 H2O, 0.05 to 0.1 g of Ni (CH3OO) 2.4 H2O and 0.1 to 0.2 g of CH4N2S; (2) preparatinga reaction solvent: respectively transferring 5-10mL of an N, N-dimethylformamide solvent and 5-10mL of deionized water to dissolve reactants in the step (1), so as to obtain a reaction mixed solution; and (3) making a reaction: transferring the reaction mixed solution into a high-pressure reaction kettle, sealing the reaction kettle, reacting at 180-220 DEG C for 8-16 hours, and washing and separating the product to obtain the bifunctional catalyst. The modified electrode prepared from the bifunctional catalyst has two purposes, hydrogen peroxide can be quantitatively detected under negative potential, levodopa can also be quantitatively detected under positive potential, and the electrochemical detection application of the catalyst has the advantages of high sensitivity, good selectivity and low detection limit.

Description

technical field [0001] The invention relates to the technical field of material preparation and electrochemical detection, in particular to a bifunctional catalyst and its preparation method and application. Background technique [0002] Hydrogen peroxide aqueous solution, commonly known as hydrogen peroxide, is a colorless and transparent liquid that can be mixed with water in any proportion. Hydrogen peroxide has a certain sterilizing effect and is often widely used in pharmaceuticals, the environment, mining, weaving workshops, food manufacturing and chemical industries , as a signaling molecule, it also participates in the regulation of the conduction process of biological nerves. In 2017, the International Agency for Research on Cancer of the World Health Organization published hydrogen peroxide in the list of carcinogens of type 3. Therefore, it is of great practical value to find a fast, simple and highly sensitive method to measure the concentration of hydrogen perox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
CPCG01N27/308
Inventor 李俊华唐潘婷唐斯萍许志锋刘梦琴贺灵芝
Owner HENGYANG NORMAL UNIV
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