Graphene-wrapping zinc oxide three-dimensional composite material catalyst and preparation method and application thereof

A technology of graphene wrapping and composite materials, which is applied in the preparation of catalyst materials and the field of electrochemical sensors, to achieve the effect of increasing the active area, good stability, and easy and controllable operation

Active Publication Date: 2016-10-12
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have found that the abuse of chloramphenicol can lead to diseases such as aplastic anemia, cardiovascular collapse, leukemia and gray baby syndrome. Therefore, in recent years, the development of a detection method for chloramphenicol to monitor the use of antibiotics has attracted much attention

Method used

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  • Graphene-wrapping zinc oxide three-dimensional composite material catalyst and preparation method and application thereof
  • Graphene-wrapping zinc oxide three-dimensional composite material catalyst and preparation method and application thereof
  • Graphene-wrapping zinc oxide three-dimensional composite material catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of graphene oxide.

[0034] Mix 1g of graphite powder with commercially available concentrated nitric acid (3mL) and concentrated sulfuric acid (30mL) in an ice-water bath, add 2-5g of potassium permanganate while stirring, heat up to 45°C for 1 hour, then heat up to 90°C for 1 hour hour, cooled to room temperature, and stood overnight; the resulting precipitate was washed three times with distilled water and once with ethanol, and then dried at 40°C for 24 hours to obtain a graphene oxide solid.

Embodiment 2

[0036] Preparation of graphene-coated zinc oxide three-dimensional composite catalyst (3DRGO-ZnO).

[0037] Weigh 30 mg of graphene oxide prepared in Example 1 and disperse evenly in 60 mL of distilled water by ultrasonic for 30 minutes, transfer it to a 100 mL reaction kettle, and immerse the zinc foil in the above-mentioned graphene oxide aqueous solution, place in an oven Insulate at 100°C for 1 hour to reduce graphene oxide; after cooling to room temperature, transfer the zinc sheet to a clean beaker with tweezers, add 20 mL of distilled water for ultrasonic oscillation, centrifuge the obtained solution, wash the solid with distilled water for 3 times, and wash with ethanol for 1 time, then place in Dry in 40C ° oven for 24 hours, as shown in TEM picture ( figure 1 ), the obtained solid is graphene-coated zinc oxide three-dimensional composite catalyst 3DRGO-ZnO.

[0038] As a comparison, a graphene catalyst material (RGO) was prepared by hydrothermally reducing graphene...

Embodiment 3

[0040] Preparation of electrochemical sensor and quantitative determination of chloramphenicol.

[0041] Weigh 2 mg of the graphene-coated zinc oxide three-dimensional composite catalyst 3DRGO-ZnO prepared in Example 2 and disperse evenly in 1 mL of absolute ethanol by ultrasonication for 5 minutes to prepare a catalyst dispersion with a concentration of 2.0 mg / mL. Transfer 10 μL of the dispersion to the active surface of a clean glassy carbon electrode with a liquid gun and dry it with an infrared lamp to obtain an electrochemical sensor. Using a saturated calomel electrode as a reference electrode, a platinum wire as an auxiliary electrode, and a phosphate buffer solution (pH=7.4) as a measurement medium, differential pulse voltammetry was used to measure the Electrochemical scanning of chloramphenicol standard solution shows that graphene-coated zinc oxide three-dimensional composite catalyst 3DRGO-ZnO has the strongest current response intensity compared with graphene mate...

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Abstract

The invention relates to a graphene-wrapping zinc oxide three-dimensional composite material catalyst and a preparation method and application thereof. The mass percent of zinc oxide in the three-dimensional composite material catalyst is 66-70%. The graphene-wrapping zinc oxide in the composite material catalyst is in a three-dimensional shuttle shape. The preparation method comprises the steps that zinc foil is immersed into a graphene oxide water solution, a hydrothermal reaction is carried out at the temperature of 80-100 DEG C for 0.5-1 hour, ultrasonic concussion, washing and drying are carried out, and the graphene-wrapping zinc oxide three-dimensional composite material catalyst is obtained. The surface of a glassy carbon electrode is decorated with the composite material so that an electrochemical transducer can be formed, the composite material is directly applied to sensitivity detection of chloramphenicol, and the lower limit of detection can reach 0.5 micrometer. According to the grephene-wrapping zinc oxide three-dimensional composite material catalyst and the preparation method and application thereof, operation is easy and quick, and the prepared three-dimensional composite material can be applied to electrochemical sensing of chloramphenicol, has the advantages of being high in sensitivity, good in stability and capable of being repeatedly used and has potential application prospects in an electrochemical biosensor.

Description

technical field [0001] The invention belongs to the field of preparation of catalyst materials and electrochemical sensors, and in particular relates to a graphene-wrapped zinc oxide three-dimensional composite catalyst as well as its preparation method and application. Background technique [0002] Electrochemical sensors are a sensitive and simple method in chemical sensors to detect the concentration of substances based on changes in electrochemical signals such as potential, current, resistance, etc. It has the advantages of easy automation, miniaturization and intelligence. Electrocatalysts are the key materials in electrochemical sensors, so it is of great scientific significance and application value to develop efficient and stable preparation methods of composite electrocatalysts. Electrochemical sensors constructed by modifying the surface of inert electrodes with semiconductor nanomaterials (such as graphene, metal oxides, etc.) can further improve the sensitivity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06G01N27/333
CPCB01J23/06G01N27/333
Inventor 张煊张亦弛
Owner DONGHUA UNIV
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