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Preparation method of three-dimensional graphene/tungsten-based nanosheet/magnesium doped zinc oxide layer-by-layer assembly structure

A layer-by-layer assembly, graphene technology, applied in the field of photocatalytic materials, to achieve the effect of less environmental pollution, preventing agglomeration and curling, and improving the enhancement effect

Inactive Publication Date: 2015-12-09
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the band gap of zinc oxide, only the ultraviolet part of sunlight can be used

Method used

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  • Preparation method of three-dimensional graphene/tungsten-based nanosheet/magnesium doped zinc oxide layer-by-layer assembly structure
  • Preparation method of three-dimensional graphene/tungsten-based nanosheet/magnesium doped zinc oxide layer-by-layer assembly structure
  • Preparation method of three-dimensional graphene/tungsten-based nanosheet/magnesium doped zinc oxide layer-by-layer assembly structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Add 1g of commercial tungsten oxide powder and 0.1g of cetyltrimethylammonium bromide into 500mL of deionized water, ultrasonically disperse for 30min and then stir for 20min to obtain a tungsten oxide dispersion;

[0033](2) Under ultrasonic vibration, use a high-speed mechanical shear with a speed of 1000r / min to shear the tungsten oxide dispersion in the above step (1) for 1 hour, centrifuge with a speed of 4000r / min, and then stir and ultrasonically disperse 1h, obtain tungsten oxide nanosheet solution;

[0034] (3) Add 10 mL of graphene oxide solution with a concentration of 1 g / L into 50 mL of deionized water and ultrasonically disperse for 20 minutes to obtain a graphene dispersion;

[0035] (4) Add 0.2 g of polyacrylic acid to the graphene oxide dispersion obtained in (3) above, and ultrasonically disperse for 30 minutes to obtain a graphene oxide dispersion;

[0036] (5) Slowly add 2 mL of the tungsten oxide nanosheet solution obtained in the above step (2...

Embodiment 2

[0042] (1) Add 5g of commercial tungsten sulfide powder and 0.5g of cetyltrimethylammonium bromide into 800mL of deionized water, ultrasonically disperse for 40min and then stir for 40min to obtain a tungsten sulfide dispersion;

[0043] (2) Under ultrasonic vibration, use a high-speed mechanical shear with a speed of 7000r / min to shear the tungsten sulfide dispersion in the above step (1) for 3 hours, centrifuge with a speed of 8000r / min and then stir for ultrasonic dispersion 3h, obtain the tungsten sulfide nanosheet solution;

[0044] (3) Add 15 mL of reduced graphene oxide solution with a concentration of 1.2 g / L into 70 mL of deionized water for ultrasonic dispersion for 40 min to obtain a graphene dispersion;

[0045] (4) Add 0.3 g of sodium polyacrylate to the reduced graphene oxide dispersion obtained in (3) above, and ultrasonically disperse for 20 minutes to obtain a graphene dispersion;

[0046] (5) Slowly add 5 mL of the tungsten sulfide nanosheet solution obtaine...

Embodiment 3

[0051] (1) Add 8g of commercial tungsten sulfide powder and 0.8g of cetyltrimethylammonium bromide into 1000mL of deionized water, ultrasonically disperse for 30min and then stir for 30min to obtain a tungsten sulfide dispersion;

[0052] (2) Under ultrasonic oscillation, use a high-speed mechanical shear with a speed of 5000r / min to shear the tungsten sulfide dispersion in the above step (1) for 2 hours, centrifuge with a speed of 5000r / min, and then stir and ultrasonically disperse 2h, obtain the tungsten sulfide nanosheet solution;

[0053] (3) Add 10 mL of graphene solution with a concentration of 0.8 g / L into 50 mL of deionized water and ultrasonically disperse for 20 minutes to obtain a graphene dispersion;

[0054] (4) Add 0.2 g of sodium polyacrylate to the graphene dispersion obtained in (3) above, and ultrasonically disperse for 40 minutes to obtain a graphene dispersion;

[0055] (5) Under stirring and ultrasonic oscillation, slowly add 4 mL of the tungsten sulfide...

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Abstract

The invention relates to a preparation method of a three-dimensional graphene / tungsten-based nanosheet / magnesium doped zinc oxide layer-by-layer assembly structure. According to the method, graphene, tungsten-based nanosheets, zinc acetate and magnesium acetate are used as raw materials, deionized water is used as a solvent and oxalic acid is used as a complexing agent, and a co-precipitation method and subsequent heat treatment are used to prepare the three-dimensional graphene / tungsten-based nanosheet / magnesium doped zinc oxide layer-by-layer assembly structure. The most important characteristic of the invention is that a mechanical shearing method is used to prepare a water-soluble tungsten-based nanosheet dispersed solution, and the three-dimensional graphene / tungsten-based nanosheet / magnesium doped zinc oxide layer-by-layer assembly structure is obtained in a water solution; the preparation process is simple and easy to realize scale production; meanwhile, the three-dimensional graphene / tungsten-based nanosheet structure has a good synergistic effect, and is more favorable for the separation of photo-induced electrons and electron-hole pairs in comparison with a homogenous material; the three-dimensional graphene / tungsten-based nanosheet / magnesium doped zinc oxide layer-by-layer assembly structure has good photocatalytic performance and can be applied to the fields of sewage treatment, photolysis of water, air purification and solar cells.

Description

technical field [0001] The invention belongs to the field of photocatalytic materials, and relates to a method for preparing a three-dimensional graphene / tungsten-based nanosheet / magnesium-doped zinc oxide layer-by-layer assembly structure. Background technique [0002] Graphene has a special structure and excellent performance. Using it as a catalyst carrier can reduce the recombination of photogenerated electron-hole pairs in ZnO and effectively improve the photocatalytic performance of ZnO. However, due to the bandgap of zinc oxide, only the ultraviolet part of sunlight can be used. In the composite system, the main function of graphene is to disperse ZnO nanostructures and transport photogenerated electrons, which itself has no photocatalytic activity. Therefore, it is necessary to further improve the utilization rate and photocatalytic activity of graphene / zinc oxide composites for visible light. [0003] Tungsten-based nanosheets have a large specific surface area an...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J35/02
Inventor 陈传盛于伟伟刘天贵曹时义梁波
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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