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Carbon-coated metal-doped zinc oxide composite photocatalysis nano material and preparation method thereof

A technology of composite photocatalysis and nanomaterials, which is applied in the field of carbon-coated metal-doped zinc oxide core-shell structure nanorod-shaped composite photocatalytic materials, which can solve the problems of unsystematic research on the influence of photocatalytic activity.

Inactive Publication Date: 2015-01-14
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Use low-temperature solvothermal method to prepare metal ion (such as Co, Ni, Mn, Fe) doped ZnO and then deposit a carbon layer on its surface to change the internal electron-hole migration path of zinc oxide, improve the separation efficiency of photogenerated electron-hole, and enhance its There are not many reports about the visible light absorption ability and the adsorption ability of dye molecules, and the improvement of the catalytic activity of the product, and the influence of the morphology, particle size distribution, doping ratio, and carbon layer thickness on the photocatalytic activity of zinc oxide and the relevant mechanism of action. Research is not systematic

Method used

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  • Carbon-coated metal-doped zinc oxide composite photocatalysis nano material and preparation method thereof
  • Carbon-coated metal-doped zinc oxide composite photocatalysis nano material and preparation method thereof
  • Carbon-coated metal-doped zinc oxide composite photocatalysis nano material and preparation method thereof

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preparation example Construction

[0031] Carbon-coated metal-doped zinc oxide composite photocatalytic nanomaterial is a material with visible light catalytic activity. The material has a rod-shaped core-shell structure. The layer coating thickness is 7-12.5 nm. Its preparation method comprises the following steps:

[0032] (1) Preparation of precursor solution:

[0033] Dissolve zinc salt and doped metal salt in 20mL alcohol solvent, in which the total molar weight of metal ions is 5mmol, and the doping concentration of metal ions is 1-5mol%, then add 10-50mmol of sodium hydroxide, and stir to obtain a precursor solution ;

[0034] (2) Put the precursor solution in a high-pressure reactor, seal it, and react at 120-160°C for 2-12 hours;

[0035] (3) Cool to room temperature after the reaction, wash the product repeatedly with absolute ethanol, and dry at 60°C for 2–6 hours to obtain metal ion-doped zinc oxide Zn 1-x m x O rod-shaped photocatalytic nanomaterials. Zn 1-x m x O nanorods are 200-500nm lon...

Embodiment 1

[0040] 1.087g (4.95mmol) zinc acetate and 0.05mmol (0.012g) nickel acetate are dissolved in 20mL methanol, wherein the total molar weight of metal ions is 5mmol, and the nickel ion doping concentration is 1mol%, then add 50mmol of sodium hydroxide, Stir to obtain a precursor solution; place the precursor solution in a high-pressure reactor, seal it, and react at 140°C for 2h; after the reaction, cool to room temperature, wash the product repeatedly with absolute ethanol, and dry at 60°C for 2h to obtain nickel-doped zinc oxide Zn 1-x Ni x O rod-shaped photocatalytic nanomaterials. The microstructure of the obtained product is as figure 1 shown.

Embodiment 2

[0042] By adopting the technique in Example 1, the amount of zinc salt and nickel salt reactants used is changed to 1.0427g (4.75mmol) and 0.0622g (0.25mmol) respectively, and the nickel ion doping concentration is increased to 5mol%, and nickel doping can also be obtained. ZnO nanorods, such as figure 2 shown. Phase analysis ( image 3 ) shows that the product obtained in Example 1 and Example 2 is Zn 1-x Ni x O system, no other impurity phase exists.

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Abstract

The invention discloses a carbon-coated metal-doped zinc oxide composite photocatalysis nano material which is a material with visible light catalysis activity. The material has appearance of a nanorod type core-shell structure. A preparation method comprises two steps of (1) putting zinc salt and a metal salt-doped alcohol-alkali solution into a high-pressure reaction kettle, performing reaction at the temperature of 120-160 DEG C for 2-12 hours, collecting solids, washing the solids with ethanol, and drying to obtain a metal-doped zinc oxide nanorod; and (2) performing ultrasonic dispersion on the metal-doped zinc oxide nanorod in water, under a condition of stirring, adding an alcoholic solution of glucose to obtain a mixture, wherein the mass ratio of metal-doped zinc oxide to glucose is (1 to 2)-(3 to 2), putting the mixture into the high-pressure reaction kettle for reacting at the temperature of 180 DEG C for 6-15 hours, collecting solids, washing the solids with ethanol, and drying a product in air. The material is relatively high in light absorption and light response in a visible light range, and the activity of visible light catalytic degradation on industrial dye wastewater can be obviously improved.

Description

technical field [0001] The invention relates to the fields of photocatalytic nanomaterials and environmental protection, in particular to a simple method for preparing a carbon-coated metal-doped zinc oxide core-shell structure nano-rod composite photocatalytic material with visible light catalytic activity by using a low-temperature solvothermal method. Background technique [0002] As a semiconductor photocatalyst, zinc oxide (ZnO) has a forbidden band width of 3.2eV, and its absorption wavelength threshold is mostly in the ultraviolet region less than 387nm, so the utilization efficiency of sunlight is low. At the same time, the disadvantages of high carrier recombination rate and low quantum efficiency also limit its practical use, and its catalytic efficiency has not yet reached the level of industrial application. [0003] Through the synthesis of four-needle whiskers, self-assembly of nanorods and other morphology control, nano-ZnO modified multi-walled carbon nanotub...

Claims

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Application Information

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IPC IPC(8): B01J23/06B01J23/80B01J35/02C02F1/30
Inventor 乔儒殷巧巧朱兰兰吴文杰李苗苗童国秀
Owner ZHEJIANG NORMAL UNIVERSITY
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