Method for preparing visible-light responsive TiO2-doped high-temperature molten salt

A high-temperature melting and high-temperature molten salt technology, applied in chemical instruments and methods, luminescent materials, hydrogen production, etc., can solve the problems affecting the application performance of nano-photocatalytic materials, easy agglomeration, and instability of nano-photocatalytic materials.

Inactive Publication Date: 2019-09-13
WUHAN UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the synthesis methods of nano-photocatalytic materials, such as high-temperature pyrolysis, high-temperature and high-pressure synthesis, and electrochemical deposition, generally have shortcomings such as instability and easy agglomeration of nano-photocatalytic materials, which greatly affect the development of nano-photocatalytic materials. application performance

Method used

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  • Method for preparing visible-light responsive TiO2-doped high-temperature molten salt
  • Method for preparing visible-light responsive TiO2-doped high-temperature molten salt
  • Method for preparing visible-light responsive TiO2-doped high-temperature molten salt

Examples

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Effect test

Embodiment 1

[0031] Weigh 500 g of LiCl, NaCl, and KCl (molar ratio 47.5:15:37.5) and mix them evenly, put them into a quartz crucible, raise the temperature at 5°C / min to 300°C and keep it for 24 hours to remove the moisture in the salt, then raise the temperature at 10°C / min To 520 ℃, keep warm for half an hour to completely melt the salt and form a uniform mixed salt. Weigh 2g of melamine powder, press it into a tablet with a tablet machine, wrap it with nickel foam and tie it to a molybdenum wire, put it in a high-temperature molten salt and react for 60min, and the reaction is carried out under an inert atmosphere of Ar. The nickel foam was taken out and soaked in deionized water for 24 hours, the nickel foam was peeled off, and the product was collected. The obtained product was washed by centrifugation with deionized water and ethanol four times each, at a rotation speed of 5000 r / min, for 3 minutes. Then the product was dried at 80° C. to obtain molten salt carbonized nitrogen nan...

Embodiment 2

[0033] Weigh 500 g of LiCl, NaCl, and KCl (molar ratio 47.5:15:37.5) and mix them evenly, put them into a quartz crucible, raise the temperature at 5°C / min to 300°C and keep it for 24 hours to remove the moisture in the salt, then raise the temperature at 10°C / min Heat to 520°C, keep warm for half an hour until the salt is completely melted and a uniform mixed salt is formed. Weigh 2g metatitanic acid (TiO(OH) 2) powder, made into tablets with a tablet machine, wrapped with foamed copper and put into high-temperature molten salt to react for 60min, and the reaction was carried out under an inert atmosphere of Ar. The nickel foam was taken out and soaked in deionized water for 24 hours, and the copper foam was peeled off to collect the product. The obtained product was washed by centrifugation with deionized water and ethanol four times each, at a rotation speed of 5000 r / min, for 3 minutes. Then the product was dried at 80° C. to obtain molten salt titanium dioxide nanometer...

Embodiment 3

[0035] Weigh 500g of LiCl, NaCl, and KCl (molar ratio 47.5:15:37.5) and mix them evenly, put them into a quartz crucible, dry at 300°C for 24 hours to remove the moisture in the salt, and then raise the temperature to 520°C at 10°C / min , keep warm until the salt is completely melted. Weigh 2g metatitanic acid (TiO(OH) 2 ) powder and 100mg melamine powder were mixed evenly, pressed into tablets with a tablet machine, wrapped with foamed nickel and put into high-temperature molten salt to react for 60min, and reacted in N 2 in the atmosphere. The nickel foam was taken out and soaked in deionized water for 24 hours, the nickel foam was peeled off, and the product was collected. The obtained product was washed by centrifugation with deionized water and ethanol four times each, at a rotation speed of 5000 r / min, for 3 minutes. Then the product was dried at 80° C. to obtain molten salt titanium dioxide / nitrogen carbide composite nanometer photocatalytic material.

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Abstract

The invention provides a method for preparing a visible-light responsive TiO2-doped high-temperature molten salt. The method comprises the following steps: heating a solid salt in a sealed high-temperature-resistant crucible to melt the solid salt into an ionic liquid; uniformly mixing a precursor containing a non-metallic element and a precursor material containing titanium, placing the mixture into the molten salt, and performing a reaction in an inert-gas atmosphere; and putting the obtained product into deionized water for soaking, performing centrifugal washing by using deionized water and ethanol for multiple times, and performing drying to obtain the photocatalytic material. According to the method provided by the invention, the photocatalytic material obtained by the method has obviously-enhanced ultraviolet-visible absorption spectrum (UV-vis) absorption, greatly-enhanced fluorescence performance and improved photocatalytic performance, has less gas pollution in the reaction process and cheap and reusable raw materials, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a novel method for preparing functional materials from high-temperature molten salts, thereby improving its photoelectric catalytic performance. Background technique [0002] Photocatalytic technology can mineralize organic pollutants into non-toxic small molecules such as carbon dioxide and water, so as to realize efficient, fast and harmless environmental pollution control and ecological restoration, and has broad development prospects in the environmental field. Among all kinds of photocatalysts, titanium dioxide has attracted the attention of researchers because of its strong oxidation, high adsorption and superhydrophilicity, and the material itself has stable chemical properties, cheap and non-toxic. It has been proved to be an effective photocatalyst, but since pure titanium dioxide only absorbs in the ultraviolet region (wavelength ≤ 365nm), and has a wide band gap (3.2eV), it can only be excited by ultraviolet light, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C09K11/67C01B3/04
CPCB01J27/24B01J35/004C01B3/042C01B2203/1041C09K11/671Y02E60/36
Inventor 肖巍汪的华李妮曾晨
Owner WUHAN UNIV
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