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Application of aluminoborate as fluorine adsorbent

A boro-aluminate and adsorbent technology, applied in the directions of borate, adsorbed water/sewage treatment, boron compounds, etc., can solve the problems of high cost and unusable adsorbent, and achieve low cost, strong adsorption, and suitable wide range of effects

Active Publication Date: 2020-04-21
JILIN UNIV
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  • Description
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Problems solved by technology

[0003] Patent CN107282022A discloses a layered crystal structure inorganic fluorine removal adsorbent composed of lithium hydroxide, aluminum hydroxide and lanthanum hydroxide. The adsorbent is deposited in the pores of anion exchange resin. This material Good fluoride removal effect is also suitable for industrial fixed bed fluoride removal applications, but the synthesis requires rare earth metal lanthanum, which makes the adsorbent cost high and the applicable pH range is 5-9, so it cannot be used in a strong acidic environment

Method used

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  • Application of aluminoborate as fluorine adsorbent
  • Application of aluminoborate as fluorine adsorbent

Examples

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preparation example Construction

[0020] In the present invention, the preparation method of the boroaluminate preferably comprises the following steps:

[0021] (1) Boric acid, aluminum chloride, ammonia water and water are mixed under heating conditions, then cooled to room temperature, and hydrochloric acid is used to adjust the pH value of the mixed solution to 3.0-3.5 to obtain a gel;

[0022] The mass ratio of the boric acid and aluminum chloride is 25-35:15-25;

[0023] (2) subjecting the gel to hydrothermal crystallization to obtain the boroaluminate.

[0024] In the invention, boric acid, aluminum chloride, ammonia water and water are mixed under heating conditions, then cooled to room temperature, and hydrochloric acid is used to adjust the pH value of the mixed solution to 3.0-3.5 to obtain a gel. In the present invention, the mass ratio of boric acid to aluminum chloride is preferably 29:18. In the present invention, the water is preferably deionized water; the mass ratio of boric acid to water i...

Embodiment 1

[0038] (1) 15g of boric acid was added to 120g of deionized water, and dissolved in a 70°C water bath to obtain a clear solution;

[0039] (2) Add 9 g of aluminum chloride to the solution obtained in step (1), stir for 30 minutes, then add 12 mL of aqueous ammonia with a mass concentration of 28%, stir for 1.5 hours, and cool to room temperature;

[0040] (3) Using hydrochloric acid with a concentration of 12mol / L to adjust the pH value of the solution obtained in step (2) to 3.1 to obtain a gel;

[0041] (4) Put the gel obtained in step (3) into a reaction kettle, put it in a 160°C oven for hydrothermal crystallization for 1 day; cool the crystallized product to room temperature, centrifuge the crystallized product, and Wash with distilled water and dry to obtain boroaluminate.

[0042] Characterize the boroaluminate obtained in Example 1, and test the adsorption effect on fluoride ions, specifically as follows:

[0043] (1) Characterize the boroaluminate obtained in Example ...

Embodiment 2

[0063] Change the temperature of hydrothermal crystallization in step (4) of Example 1 to 150°C, and the others are the same as in Example 1 to obtain boroaluminate.

[0064] The X-ray powder diffraction pattern and the scanning electron microscope image of the boroaluminate that embodiment 2 obtains are respectively with figure 1 , figure 2 Similarly, the boroaluminate obtained in Example 2 is a cationic framework material with a lamellar morphology.

[0065] Adopt the method for above-mentioned (A) process to test the adsorption capacity of the boroaluminate that embodiment 2 obtains, record to F - The adsorption rate is 95.7%, and the adsorption capacity is 38.28mg / g.

[0066] Adopt the method of above-mentioned (B) process to test other competing ions (Cl - , NO 3 - ) to the influence of embodiment 2 boroaluminate adsorption fluoride ions, even if there is a certain amount of negative monovalent anion in the result, the boroaluminate that embodiment 2 obtains is to F...

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Abstract

The invention provides application of aluminoborate as a fluorine adsorbent, belonging to the technical field of wastewater treatment. The aluminoborate comprises the following chemical components: B,Al and Cl, wherein the value of n(B / Al) is equal to 0.45-0.65, and the value of n(Cl / Al) is equal to 0.17-0.27. The aluminoborate is a cationic framework material with lamellar morphology. Accordingto the invention, fluorine ions are adsorbed by the aluminoborate, so fluorine removal effect is excellent, fluorine ion-containing wastewater with a pH value of 3-11 can be effectively treated, and the aluminoborate is resistant to acid, wide in application range and low in cost. By means of the aluminoborate, fluoride with a content exceeding the standard in water can be treated to a content lower than a fluoride limit value specified by the national drinking water standard in China; and even under the interference of other competitive ions, the aluminoborate still has excellent selective adsorption performance on fluorine ions.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to the application of boroaluminate as a fluorine adsorbent. Background technique [0002] The fluorine content of groundwater in some areas of our country seriously exceeds the standard. Long-term drinking of high-fluorine water will lead to dental fluorosis and bone disease, which will have a serious impact on the health of residents. The World Health Organization recommends that the concentration of fluoride in drinking water should not exceed 1.5mg / L, and the current drinking water standard in my country stipulates that the concentration of fluoride in drinking water should not exceed 1.0mg / L. [0003] Patent CN107282022A discloses a layered crystal structure inorganic fluorine removal adsorbent composed of lithium hydroxide, aluminum hydroxide and lanthanum hydroxide. The adsorbent is deposited in the pores of anion exchange resin. This material Good defluorination effect i...

Claims

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Application Information

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IPC IPC(8): B01J20/02C01B35/12C02F1/28B01J20/30C02F101/14
CPCB01J20/0248B01J20/027C01B35/126C01P2002/72C02F1/281C02F2101/14
Inventor 闫文付徐天昊白璞于吉红徐如人
Owner JILIN UNIV
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