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Fluorine removal agent with fluorine ion absorption/desorption function through pH value regulation and control and preparation method thereof

A technology for removing fluoride and fluoride ions, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of influence and secondary pollution, and achieve simple process, easy operation and low investment. Effect

Inactive Publication Date: 2013-06-19
CILIN & CAS ENVIRONMENTAL TECH ANHUIINC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of use, there are disadvantages such as secondary pollution caused by aluminum loss and easy to be affected by other anions in water.

Method used

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  • Fluorine removal agent with fluorine ion absorption/desorption function through pH value regulation and control and preparation method thereof
  • Fluorine removal agent with fluorine ion absorption/desorption function through pH value regulation and control and preparation method thereof
  • Fluorine removal agent with fluorine ion absorption/desorption function through pH value regulation and control and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Surface activation of silica particles: Weigh 0.5 g of silica microspheres with a diameter of 250 nanometers, perform activation treatment under oxygen plasma for 30 minutes, and carry out carboxylation treatment in time for the activated silica microspheres;

[0039] (2) Carboxylation of the surface of silica particles: Dissolve 0.5 g of activated silica microspheres and 0.5 g of terephthalic acid in 20 ml of DMF solution, place the mixed solution in a 50 ml round bottom flask, and Ultrasound was used to dissolve it, and then 0.5 g of anhydrous sodium carbonate was added, and the mixture was stirred and reacted in an oil bath at 120°C for 2 hours. After cooling to room temperature, the product was obtained by centrifugation, washed several times with ethanol and water, dried and set aside;

[0040] (3) Growth of metal-organic framework shell on the surface of silica particles: at room temperature, weigh 0.5 g of carboxylated silica microspheres and disperse them in...

Embodiment 2

[0042] (1) Surface activation of silica particles: Weigh 0.5 g of silica microspheres with a diameter of 250 nm and place them in a prepared sodium hydroxide solution with a concentration of about 0.1 mol / L, and mix with 100 o Stir for 2 hours at C temperature, centrifuge, wash with deionized water 3 times, 60 o C under vacuum drying;

[0043] (2) Carboxylation of the surface of silica particles: Dissolve 0.5 g of activated silica microspheres and 0.5 g of terephthalic acid in 20 ml of DMF solution, place the mixed solution in a 50 ml round bottom flask, and Ultrasound was used to dissolve it, and then 0.5 g of anhydrous sodium carbonate was added, and the mixture was stirred and reacted in an oil bath at 120°C for 2 hours. After cooling to room temperature, the product was obtained by centrifugation, washed several times with ethanol and water, dried and set aside;

[0044] (3) Growth of metal-organic framework shell on the surface of silica particles: at room temperature, ...

Embodiment 3

[0046] (1) Surface activation of silica particles: Weigh 0.5 g of silica microspheres with a diameter of 250 nm and place them in a prepared sodium hydroxide solution with a concentration of about 0.1 mol / L, and mix with 100 o Stir for 2 hours at C temperature, centrifuge, wash with deionized water 3 times, 60 o C under vacuum drying;

[0047] (2) Carboxylation of the surface of silica particles: Weigh 0.2 g of activated silica microspheres and dissolve them in 10 ml of anhydrous N,N-dimethylformamide (DMF), then add 3-aminopropyl Triethoxysilane (APTMS) 2 ml, after the mixture is dissolved, at 120 o Stirring at C temperature for 6 hours, after the reaction, the obtained product was centrifuged and washed with DMF. The product obtained was dissolved in 10 milliliters of DMF solution, and another 0.9 gram of maleic anhydride was weighed and dissolved in 20 milliliters of ethanol solution, the two solutions were mixed and stirred at room temperature for 24 hours, and finally t...

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Abstract

The invention discloses a fluorine removal agent with a fluorine ion absorption / desorption function through pH value regulation and control. The agent is of a core-shell structure. The agent mainly comprises a silica core and a metal organic framework shell layer which covers a silica surface and is provided with pore paths, wherein silica particles are spherical or irregular in shape, and the particle size is 100-5000 nanometers; and the pore size of the pore paths of the shell layer is between the diameters of a hydrated fluorine ion and a hydrated silicon hexafluoride ion. The invention further discloses a preparation method of the fluorine removal agent. The fluorine removal agent has the fluorine ion absorption / desorption function through pH value regulation and control. The fluorine removal agent can greatly absorb the fluorine ions in the water under the acid condition, and the fluorine ions which are greatly absorbed by the fluorine removal agent can be greatly desorbed under the alkaline condition. The method has the characteristics of accurately controlled thickness, pore path structure and pore size of the metal organic framework shell layer, and is low in preparation equipment investment, simple in technology and easy to operate.

Description

technical field [0001] The invention relates to a fluoride-removing agent for controlling pH value to absorb / desorb fluoride ions and a preparation method thereof. More specifically, the present invention proposes a silica-metal-organic framework core-shell structure defluoridation agent that can adsorb fluoride ions in the water environment under acidic conditions and desorb under alkaline conditions, and provides corresponding preparation method. Background technique [0002] Metal-organic framework materials are a new type of functional materials developed in recent years, which are obtained by the complexation of metal ions and bridging organic ligands. Because of its high porosity, large specific surface area, convenient synthesis, variable framework size, chemical modification according to the target requirements, rich structure, etc., coupled with the significant improvement in the stability of metal-organic frameworks in recent years, making It has attractive appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F1/58
Inventor 罗涛张楠通遇鑫遥金震孙柏孟凡利刘锦准
Owner CILIN & CAS ENVIRONMENTAL TECH ANHUIINC
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