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Preparation and application of graphene-based cadmium sulfide composite

A technology of alkenyl cadmium sulfide and composite materials, applied in the direction of material electrochemical variables, etc., can solve the problems of agglomeration growth, easy migration of nano-catalyst particles, loss of catalytic activity, etc., to prevent powder agglomeration deactivation, electron transport ability Enhanced, easily controlled effects of reaction conditions

Inactive Publication Date: 2014-10-08
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strong π–π interaction between graphene nanosheets makes the catalyst agglomerated severely and thus covers a large number of active sites; Particles are prone to migration and agglomeration to reduce or even lose catalytic activity

Method used

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  • Preparation and application of graphene-based cadmium sulfide composite
  • Preparation and application of graphene-based cadmium sulfide composite
  • Preparation and application of graphene-based cadmium sulfide composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Weigh 10 mg of ground graphite oxide and disperse it in 50 mL of ultrapure water for ultrasonic treatment for 2 h, let it stand for 4 hours, take the clear brown liquid in the upper layer, that is, graphene oxide (GO) solution for use; weigh 0.1142 g of CdCl 2 2.5H 2 Dissolve O in 75mL ultrapure water, stir magnetically for 15min to dissolve completely, and pass nitrogen gas during this process;

[0029] 2) Take 15 mL of graphene oxide (GO) solution and add CdCl 2 Continue to stir in the aqueous solution for 15min to make Cd 2+ Fully adsorbed on the surface of graphene oxide; add 0.1241g of Na 2 S 2 o 3 ·5H 2 O continued to stir for 15min to make S 2 o 3 2- With the Cd adsorbed on the GO surface in advance 2+ Adsorption occurs; put the reaction solution into a hydrothermal reaction kettle, and put it in an oven at a constant temperature of 160°C for about 8 hours;

[0030] 3) The reacted hydrothermal kettle was naturally cooled overnight, and the hydrotherm...

Embodiment 2

[0032] 1) Weigh 0.1142g CdCl 2 2.5H 2 O was dissolved in an appropriate amount of ultrapure water and magnetically stirred for 15 minutes to completely dissolve, and nitrogen gas was introduced during this process;

[0033] 2) Add 0.1241g Na 2 S 2 o 3 ·5H 2 O continued to stir for 15min to make S 2 o 3 2- with Cd 2+ Adsorption occurs; put the reaction solution into a hydrothermal reaction kettle, and put it in an oven at a constant temperature of 160°C for 10 hours;

[0034] 3) The reacted hydrothermal kettle was naturally cooled overnight, and the sample was taken out, washed three times with ultrapure water, and dried to obtain CdS crystals.

Embodiment 3

[0036] like figure 1 shown, including the following steps:

[0037]1) Mix 0.5g of sodium nitrate and 34mL~44mL of concentrated sulfuric acid in a beaker, put them in an ice-water bath and stir, add 1g of 325 mesh flake graphite and continue to stir for 30 minutes to fully react, so that the graphite layer is fully oxidized, and carboxyl, hydroxyl and bridge oxygen group; then add 5g of potassium permanganate, the process of adding should be slow, continue to react for 30min, and then react at a constant temperature of 35°C for 2h; add 50mL of ultrapure water and keep stirring; move the beaker into a preheated to 98°C In an oil bath reactor, react for 15 minutes, add 4mL of 30% hydrogen peroxide dropwise to the reaction solution; wash with dilute hydrochloric acid, filter the product, and wash repeatedly with deionized water until neutral; filter the final product with suction , dry, and the dried product is solid graphite oxide, which is ground into a powder with an agate mor...

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Abstract

The invention relates to preparation and application of a graphene-based cadmium sulfide composite. The preparation comprises the following steps: preparing graphite oxide by using an improved Hummers method; then preparing graphene by using an ultrasonic dispersion method; and with graphite oxide as a carrier, preparing the graphene / cadmium sulfide (RGO-CdS) composite by using a hydrothermal synthesis method. An electrode material is prepared from the composite, activity of the electrode material prepared from the composite is further tested by using cyclic voltammetry, so the electrode material can be used for detection of hydrogen peroxide. The electrode material prepared from the composite has the advantages of low cost, simple process and high stability and is expected to be used as an enzyme-free detection material for electrochemical detection of trace hydrogen peroxide.

Description

technical field [0001] The invention relates to the preparation and application of a graphene-based cadmium sulfide composite material. Background technique [0002] As we all know, due to the excellent properties of nanocomposites, many fruitful research works have been carried out on carbon nanotube composites and a variety of other materials, including semiconductors, metals and polymers. Recently, due to the rapid development of synthesis methods of thin-layer graphene sheets, graphene has been widely used as an emerging support in composite materials. Graphene is a semiconductor material with a zero-dimensional band gap and unique carrier characteristics. It is a single-layer structure composed of carbon six-membered rings closely packed. Each carbon atom is sp 2 In the hybrid structure, the remaining electron in the p orbital forms a large π orbital, in which electrons can move freely, making graphene have good conductivity. Therefore, the preparation of graphene an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N27/30
Inventor 褚佳李杨朱雪丹熊善新马晶
Owner XIAN UNIV OF SCI & TECH
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