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Preparation method for petal-like magnesium aluminum hydrotalcite used for phosphorous removal by adsorption

A magnesium-aluminum hydrotalcite and petal-shaped technology, which is applied in the field of preparation of petal-like magnesium-aluminum hydrotalcite, can solve problems such as large specific surface area and hydrotalcite agglomeration, and achieve large specific surface area, balanced molecular structure, and adjustable surface charge density. tune effect

Inactive Publication Date: 2019-04-12
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a method for preparing magnesium aluminum hydrotalcite that solves the problem of hydrotalcite agglomeration, has a large specific surface area, and has a strong adsorption capacity for phosphate radicals in water

Method used

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  • Preparation method for petal-like magnesium aluminum hydrotalcite used for phosphorous removal by adsorption
  • Preparation method for petal-like magnesium aluminum hydrotalcite used for phosphorous removal by adsorption
  • Preparation method for petal-like magnesium aluminum hydrotalcite used for phosphorous removal by adsorption

Examples

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Effect test

Embodiment 1

[0023] Prepare magnesium aluminum hydrotalcite material by titration method: configure 300ml of sodium carbonate solution with a concentration of 0.17mol / l; take 150mL of magnesium nitrate hexahydrate with a concentration of 0.66mol / l, and aluminum chloride hexahydrate with a concentration of 0.34mol / l 150mL, after mixing the two solutions, titrate into the sodium carbonate solution at a speed of 30 drops / min for reaction, the reaction is carried out in a constant temperature water bath at 65°C with a stirring speed of 400rmp, and the pH value is maintained by sodium hydroxide during the process In 8-9, a white precipitate will be found during the reaction. After the titration is completed, let it stand in an oven at 65°C for 18 hours, then wash the reaction product with distilled water until it is neutral, dry it in an oven at 80°C, and grind it. The prepared hydrotalcite material was obtained, and the product was calcined in a muffle furnace at 500° C. for 3 hours for use.

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Embodiment 2

[0028] Prepare magnesium aluminum hydrotalcite material by titration method: configure 300ml of sodium carbonate solution with a concentration of 0.18mol / l; take 150mL of magnesium nitrate hexahydrate with a concentration of 0.92mol / l, and aluminum chloride hexahydrate with a concentration of 0.34mol / l 150mL, after mixing the two solutions, titrate into the sodium carbonate solution at a rate of 20 drops / min for reaction, the reaction is carried out in a constant temperature water bath at 60°C with a stirring speed of 380rmp, and the pH value is maintained by sodium hydroxide during the process In 8-9, a white precipitate will be found during the reaction. After the titration is completed, let it stand in an oven at 60°C for 20 hours, then wash the reaction product with distilled water until it is neutral, dry it in an oven at 80°C, and grind it to obtain For the prepared hydrotalcite material, the product was calcined in a muffle furnace at 450°C for 5 hours for later use.

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Embodiment 3

[0031] Prepare magnesium aluminum hydrotalcite material by titration method: configure 300ml of sodium carbonate solution with a concentration of 0.17mol / l; take 150mL of magnesium nitrate hexahydrate with a concentration of 0.66mol / l, and aluminum chloride hexahydrate with a concentration of 0.36mol / l 150mL, after mixing the two solutions, titrate into the sodium carbonate solution at a speed of 40 drops / min for reaction, the reaction is carried out in a constant temperature water bath at 75°C at a stirring speed of 420rmp, and the pH value is maintained by sodium hydroxide during the process In 8-9, a white precipitate will be found during the reaction. After the titration is completed, let it stand in an oven at 80°C for 16 hours, then wash the reaction product with distilled water until it is neutral, dry it in an oven at 80°C, and grind it to obtain For the prepared hydrotalcite material, the product was calcined in a muffle furnace at 460°C for 5 hours for later use.

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Abstract

The invention discloses a preparation method for petal-like magnesium aluminum hydrotalcite used for phosphorous removal by adsorption. The preparation method comprises the following steps that 1, a sodium carbonate solution is prepared; 2, magnesium nitrate hexahydrate and aluminum chloride hexahydrate are obtained and used for preparing a magnesium aluminum mixed solution; 3, the magnesium aluminum mixed solution is dropwise added into the sodium carbonate solution, in a constant temperature water bath, stirring is conducted for a reaction, and the pH value is adjusted with sodium hydroxide;4, a reaction liquid obtained after crystallization of a turbid liquid is filtered, washed, dried and ground, and magnesium aluminum hydrotalcite is obtained; 5, the magnesium aluminum hydrotalcite obtained in the fourth step is calcined for 3-5 hours at the temperature of 450-500 DEG C, and then the petal-like magnesium aluminum hydrotalcite is obtained. When the magnesium aluminum hydrotalciteis prepared by using the method, the process is simple, the problem of agglomeration is solved, and the petal-like magnesium aluminum hydrotalcite material is large in specific surface area, good in morphology and high in degree of crystallinity, the two kinds of metal have a lot of net positive charges, a good environment is provided for physical electrostatic adsorption, the adsorption effect isgood, the application range is wide, and the petal-like magnesium aluminum hydrotalcite has a wide application prospect in the field of phosphorous-containing water treatment and the like.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a preparation method of petal-like magnesium-aluminum hydrotalcite which can efficiently absorb phosphate from water. Background technique [0002] As an important raw material, phosphorus is widely used in industry and agriculture, and it mainly exists in water in the form of phosphate. Excessive phosphorus is discharged into surface water in large quantities through sewage discharge and agricultural runoff, resulting in eutrophication of water bodies and seriously affecting people's lives. The World Health Organization requires that the discharge of phosphorus is not higher than 0.5-1mg / l, so it is extremely important to solve the problem of phosphorus content in water. The methods currently used for phosphorus removal in water mainly include chemical precipitation, biological methods, and adsorption methods. Among them, the chemical method usually needs t...

Claims

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Application Information

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IPC IPC(8): B01J20/08B01J20/28B01J20/30C02F1/28C02F101/10
CPCB01J20/08B01J20/28042C02F1/281C02F2101/105
Inventor 刘琳张兴枝姚菊明
Owner ZHEJIANG SCI-TECH UNIV
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