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Black molybdenum trioxide nanosheet, preparation method and application thereof

A technology of molybdenum trioxide and nanosheets, applied in chemical instruments and methods, molybdenum oxide/molybdenum hydroxide, general water supply saving, etc., can solve the problems of limitation, low absorption rate of visible light and infrared light, etc., and achieve enhanced absorbance, preparation The effect of simple process

Inactive Publication Date: 2021-04-23
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But since MoO 3 With a wide energy band gap, it can only absorb ultraviolet light with a short wavelength in the solar spectrum, so the common appearance color is white or light yellow, and the absorption rate of visible light and infrared light is low, which limits the MoO 3 Applications in the field of light-to-heat conversion

Method used

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  • Black molybdenum trioxide nanosheet, preparation method and application thereof
  • Black molybdenum trioxide nanosheet, preparation method and application thereof
  • Black molybdenum trioxide nanosheet, preparation method and application thereof

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preparation example Construction

[0030] The invention provides a method for preparing black molybdenum trioxide nanosheets, comprising:

[0031] A) Mix Mo powder and hydrogen peroxide solution and react to obtain MoO 3 Precursor material liquid;

[0032] B) MoO 3 The precursor material liquid is heated and reacted to obtain a precipitate, which is washed, dried, and calcined to obtain yellow MoO 3 Nanosheets;

[0033] C) Yellow MoO 3 The nanosheets are mixed with the metal powder, dispersed in the solution, mixed with concentrated hydrochloric acid, stirred, washed, and dried to obtain black molybdenum trioxide nanosheets.

[0034] The invention provides a method for preparing black molybdenum trioxide nanosheets, first preparing MoO 3 Precursor material liquid.

[0035] Mix Mo powder and hydrogen peroxide solution and react to obtain MoO 3Precursor material liquid.

[0036] The metal Mo powder was added into the hydrogen peroxide solution, and after heating and magnetic stirring, a soluble precursor ...

Embodiment 1

[0070] Weigh 0.1 g of metal Mo powder, dissolve it in a glass beaker with a volume of 20 mL and a concentration of 1 mol / L hydrogen peroxide ethanol solution, then heat the solution to 70 ° C, and stir for 2 hours to obtain a yellow clear solution

[0071] The above solution was transferred to a 25mL hydrothermal kettle, sealed and heated to 160°C for 18 hours. After the reaction is over, collect the precipitate at the bottom of the kettle, wash it with deionized water and ethanol for 3 times and dry it, put it into a corundum crucible, put it in a muffle furnace, raise the temperature to 600°C, and calcinate in air for 24 hours to obtain Yellow crystalline MoO 3 Nanosheets.

[0072] Take 0.1 g of the above-mentioned yellow crystalline MoO3 powder, mix it with 0.1 g of metal zinc powder, grind it evenly, disperse it in 20 mL of aqueous solution, add 5 mL of concentrated hydrochloric acid solution dropwise under stirring, and continue stirring for 6 hours to obtain black MoO3 ...

Embodiment 2

[0075] Weigh 0.2 grams of metal Mo powder, dissolve it in a glass beaker with a volume of 40 mL and a concentration of 1.5 mol / L hydrogen peroxide ethanol solution, then heat the solution to 60 °C, and stir for 3 hours to obtain a yellow clear solution

[0076] The above solution was transferred to a hydrothermal kettle with a volume of 50 mL, sealed and heated to 170°C for 20 hours. After the reaction is over, collect the precipitate at the bottom of the kettle, wash it with deionized water and ethanol for 3 times and dry it, put it into a corundum crucible, place it in a muffle furnace, raise the temperature to 550°C, and calcinate in air for 22 hours to obtain Yellow crystalline MoO 3 Nanosheets.

[0077] Take the above yellow crystalline MoO 3 Mix 0.2 grams of powder with 0.2 grams of metal copper powder, grind evenly, disperse in 40 mL of aqueous solution, add 10 mL of concentrated hydrochloric acid solution drop by drop under stirring, and continue stirring for 9 hours...

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Abstract

The invention provides a preparation method of a black molybdenum trioxide nanosheet. The preparation method comprises the following steps of: mixing Mo powder and a hydrogen peroxide solution, and carrying out reaction to obtain a MoO3 precursor feed liquid; heating the MoO3 precursor feed liquid for reaction to obtain precipitate, and washing, drying and calcining the precipitate to obtain yellow MoO3 nanosheets; mixing the yellow MoO3 nanosheets with metal powder, performing dispersing in a solution, conducting mixing with concentrated hydrochloric acid, and performing stirring, washing and drying to obtain the black molybdenum trioxide nanosheet. According to the method disclosed by the invention, active metal has strong reducibility at normal temperature and normal pressure in an acidic solution, so that the valence state of Mo<6+> ions in white MoO3 can be induced to be reduced into Mo<5+>, the energy band of MoO3 is narrowed, and the absorbance of MoO3 to sunlight is enhanced. Under the irradiation of natural sunlight, seawater is used as a water source, a black MoO3 film is used as a light absorber, seawater evaporation driven by efficient solar energy can be achieved through photothermal conversion, and the interface temperature can reach 72DEG C at most.

Description

technical field [0001] The invention relates to the technical field of seawater desalination, in particular to a black molybdenum trioxide nanosheet, its preparation method and application. Background technique [0002] Nearly 70% of the earth's surface is covered by oceans, with a water content of more than 1.36×10 18 cubic meter. However, the fresh water resources available for direct use by humans only account for 0.04% of the world's total water. Freshwater ecosystems are the basis for the survival of animals and plants, but they are very fragile. With the deterioration of climate and rapid economic growth, many rivers, lakes and groundwater resources have been severely damaged by modern industrial activities, and water shortage is not only a major economic problem, but also a prominent social and political problem. In traditional industrial seawater desalination production, fresh water is mainly obtained by thermal distillation and reverse osmosis technology. In ord...

Claims

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Application Information

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IPC IPC(8): C01G39/02C02F1/14
CPCC01G39/02C01P2002/72C01P2002/80C01P2004/00C01P2004/03C01P2004/20C02F1/14C02F2103/08Y02A20/124Y02A20/142Y02A20/212
Inventor 江俊朱青罗毅李鑫杨丽
Owner UNIV OF SCI & TECH OF CHINA
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