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Preparation method for flower-like Ag2CO3/Mg-Al-NO3 LDHs nanometer material

A technology of magnesium-aluminum hydrotalcite and silver carbonate is applied in chemical instruments and methods, water pollutants, light water/sewage treatment, etc., to achieve the effects of simple preparation process and process, easy operation of preparation process and process, and low cost.

Inactive Publication Date: 2015-12-09
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there has been no relevant report on the composite nanomaterial patent of silver carbonate-modified magnesium-aluminum layered double hydroxide

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  • Preparation method for flower-like Ag2CO3/Mg-Al-NO3 LDHs nanometer material
  • Preparation method for flower-like Ag2CO3/Mg-Al-NO3 LDHs nanometer material
  • Preparation method for flower-like Ag2CO3/Mg-Al-NO3 LDHs nanometer material

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preparation example Construction

[0023] a flower-like Ag 2 CO 3 / Mg-Al-NO 3 The preparation method of LDHs nano-photocatalytic material is a preparation method of flower-shaped photocatalytic nano-materials that efficiently degrade dyes of different ion types and phenol solutions, including the following steps:

[0024] (1) At room temperature, add 8, 4, 60mmol of magnesium nitrate, aluminum nitrate and urea into 60mL of ethylene glycol and ultrapure water (V / V=9) mixed solution, fully dissolve and put it into the hydrothermal reaction kettle , reacted at 160°C for 6h, cooled (normal temperature), filtered and separated the product, washed it with deionized water and ethanol, and finally dried at 100°C for 12h to obtain flower-shaped Mg-AlLDHs;

[0025] (2) Add 1.2 g of flower-like Mg-AlLDHs into 300 mL of 0.5 M sodium carbonate solution and stir for 24 hours to obtain Mg-Al-NO 3 / CO 3 LDHs sample, and then the sample was centrifuged, washed twice with water, and finally dried at 60°C for use;

[0026] (...

Embodiment 1

[0031] At room temperature, weigh 2.0513g, 1.5001g, and 3.036g of magnesium nitrate, aluminum nitrate, and urea, respectively, and add them to 60mL of a mixed solution of ethylene glycol and ultrapure water (V / V=9), fully dissolve at room temperature, and load In a hydrothermal reaction kettle, react at 160°C for 6h. After cooling, the product is separated by filtration, cleaned with deionized water and ethanol, and finally dried at 100°C for 12h to obtain flower-like Mg-AlLDHs.

Embodiment 2

[0033] First, weigh 1.2g of the Mg-AlLDHs prepared in Embodiment 1 and add it into 300mL of 0.5M sodium carbonate solution, stir for 24h, and then add the Mg-Al-NO 3 / CO 3 LDHs samples were separated by centrifugation, washed twice with water, and finally dried at 60°C for later use. Then, after weighing 0.3g of the Mg-Al-NO obtained above 3 / CO 3Add the LDHs sample to 10mL of 0.5M sodium carbonate solution, stir for 15min, put the beaker into an oil bath and heat it to 60°C (keep stirring slowly) until it is completely evaporated to dryness, to obtain Mg-Al-CO 3 LDHs samples were finally dried at 60°C.

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Abstract

The invention discloses a preparation method for a flower-like Ag2CO3 / Mg-Al-NO3LDHs nanometer material. The preparation method comprises the following steps: adopting an ion exchange method, using flower-like Mg-Al LDHs as a precursor, dropwise adding a silver nitrate solution, continuously stirring for 1 h at the room temperature, conducting centrifugal separation on the product, cleaning with deionized water, and finally drying in a baking oven at 60 DEG C. The preparation method has the advantages that according to the prepared flower-like Ag2CO3 / Mg-Al-NO3 LDHs nanometer material, through a scanning electron microscope and a transmission electron microscope, the condition that Ag2CO3 nanometer particles are well dispersed on the lamella of flower-like Mg-Al-NO3 LDHs can be clearly observed, and under visible light, not only can dye with different ion types be efficiently degraded, but also a degradation effect is played on a phenol organic solution. The photocatalysis property attributes to the condition that under the modification of Ag2CO3 nanometer particles, heterojunction is formed between Mg-Al-NO3 LDHs and Ag2CO3, so that effective separation and transfer of electrons and holes are realized.

Description

technical field [0001] The present invention relates to a flower-shaped magnesium aluminum hydrotalcite loaded silver carbonate (Ag 2 CO 3 / Mg-Al-NO 3 LDHs) nano photocatalytic material preparation method and its photocatalytic degradation of dyes of different ion types and the application of phenol aqueous solution. Background technique [0002] With the continuous development of photocatalytic materials, it is imperative to seek high-efficiency semiconductor materials in the field of photocatalytic technology. Silver carbonate is widely used in visible light catalysis due to its narrow bandgap and sensitive visible light response. But, because of its sensitive visible light response and instability, silver carbonate is prone to light corrosion 15519-15524]. In addition, the usually prepared silver carbonate has a rod shape, about 4um. Such large particles increase the transport distance of the photogenerated electron-hole pairs and thus facilitate the recombination. ...

Claims

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Application Information

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IPC IPC(8): B01J27/25C02F1/30C02F101/38C02F101/34
Inventor 敖燕辉王沛芳王丹丹王超侯俊
Owner HOHAI UNIV
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