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Preparation method and application of a flower-shaped iron ferric oxide-molybdenum disulfide-manganese dioxide nanocomposite

A technology of ferric oxide and nanocomposites, which is applied in the direction of iron oxide/iron hydroxide, molybdenum sulfide, ferrous oxide, etc., can solve the problems of small specific surface area and low activity of molybdenum disulfide, and achieve high The effect of electrocatalytic performance, low cost, and excellent performance of nitrite

Active Publication Date: 2022-06-24
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, pure molybdenum disulfide has low activity and small specific surface area

Method used

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  • Preparation method and application of a flower-shaped iron ferric oxide-molybdenum disulfide-manganese dioxide nanocomposite
  • Preparation method and application of a flower-shaped iron ferric oxide-molybdenum disulfide-manganese dioxide nanocomposite
  • Preparation method and application of a flower-shaped iron ferric oxide-molybdenum disulfide-manganese dioxide nanocomposite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] (1) Weigh 30 grams of ferric chloride hexahydrate and 15 grams of iron sulfide in 250 ml of deionized water, respectively, introduce nitrogen for 20 minutes and stir until transparent;

[0070] (2) Stir the mixed solution obtained in step (1) at 60°C for 5 minutes, add ammonia water, and age at 70°C for 30 minutes to obtain ferric oxide;

[0071] (3) Weigh 0.3g of sodium molybdate and 0.4g of thiourea respectively in deionized water and stir well;

[0072] (4) Weigh 0.4g of the obtained ferric oxide and add it to step (3), stir at room temperature for 40 minutes, transfer to the autoclave, and react at 200 ° C for 24 hours;

[0073] (5) After centrifuging the reaction product of step (4) to remove moisture, first wash with ethanol to remove unreacted organic matter, then wash with deionized water to remove unreacted inorganic ions, and place the washed reaction product in an oven drying at 70 °C in the middle to obtain the triiron tetroxide-molybdenum disulfide nanocom...

Embodiment 2

[0083] The three-electrode system prepared in Example 1 was placed in a solution containing no and 0.5, 1, 2, and 4 mmol dm -3 0.1 mol dm of sodium nitrite -3 The catalytic performance of ferric oxide-molybdenum disulfide-manganese dioxide complexes for nitrite was determined by cyclic voltammetry in phosphate buffer solution. The cyclic voltammogram is shown in figure 2 shown.

[0084] figure 2 Modified glassy carbon electrodes for ferric oxide-molybdenum disulfide-manganese dioxide composites without and with 0.5, 1, 2, and 4 mmol dm -3 0.1 mol dm of sodium nitrite -3 Cyclic voltammogram in phosphate buffered solution. It can be seen from the figure that when the composite modified glassy carbon electrode was moved from the phosphate buffer solution to the solution containing sodium nitrite, an oxidation peak appeared near 0.7V, and the peak appeared with the increase of nitrite concentration. the current increases. This result indicates that the nitrite undergoes a ...

Embodiment 3

[0087] The three-electrode system prepared in Example 1 was placed in 0.1 mol dm -3 In the phosphate buffer solution, sodium nitrite solutions of different concentrations were added dropwise, and the response current values ​​corresponding to different concentrations of sodium nitrite solutions were measured by the potentiostatic method, and the linear relationship between the nitrite concentration and the response current was obtained ( image 3 );

[0088] from image 3 It can be seen from: Fe3O4-molybdenum disulfide-manganese dioxide composite modified glassy carbon electrode pair 0.1mmol dm -3 nitrite can respond. Figure 4 is true image 3 A plot of nitrite concentration versus response current. As can be seen from the graph: at 5.0 to 3400µmol dm -3 A good linear relationship is maintained within the range of .

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Abstract

The present invention relates to a preparation method and application of flower-shaped iron ferric oxide-molybdenum disulfide-manganese dioxide nanocomposite. Firstly, ferric chloride and iron sulfide are dispersed in deionized water, ammonia water is added and aged to obtain iron ferric oxide ; Take sodium molybdate and thiourea in deionized water and stir evenly, add ferric oxide, and transfer to a high-pressure reactor for reaction; wash with ethanol and deionized water after centrifugal separation, and dry to obtain ferric oxide-II Molybdenum sulfide finished product; containing an appropriate amount of ferric oxide-molybdenum disulfide compound, manganese sulfate monohydrate and potassium permanganate dissolved in deionized water and stirred evenly, the mixture is transferred to a high-pressure reactor for reaction; dried to obtain flower-shaped tetra Ferric oxide-molybdenum disulfide-manganese dioxide finished product; take the flower-shaped ferric oxide-molybdenum disulfide-manganese dioxide nanocomposite and disperse it in a mixture of water, ethanol and perfluorosulfonic acid, and drop-coat it on the clean surface of the glassy carbon electrode.

Description

technical field [0001] The invention relates to a preparation method and application of a flower-shaped triiron tetroxide-molybdenum disulfide-manganese dioxide nanocomposite, and belongs to the technical field of environmental detection. Background technique [0002] Nitrite is widely used in daily life as food additives and corrosion inhibitor additives, and as inorganic fertilizers to provide nitrogen to plants and vegetables. Studies have found that excessive intake of nitrite in the diet is toxic to the human body, it will interfere with the oxygen transmission system in the human body, tend to damage the kidneys, spleen, nervous system, and even cause cancer. Therefore, the real-time detection of nitrite is a very necessary and meaningful thing. Electrochemical method is one of the commonly used methods for the detection of nitrite, and it is an environmentally friendly technology. Compared with fluorescence spectrophotometry, chemiluminescence, and chromatography, el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/08C01G45/02C01G39/06G01N27/416
CPCC01G49/08C01G39/06C01G45/02G01N27/4166C01P2004/80
Inventor 王宏归潘华伟张娅
Owner YANGZHOU UNIV
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