Efficient rare earth modified defluorination material and preparation method thereof

A technology of rare earth modification and fluorine materials, applied in chemical instruments and methods, other chemical processes, magnesium oxide, etc., can solve the problem of insufficient stability of loaded rare earth elements, and achieve the effect of enhancing fluorine removal effect, reducing temperature and stabilizing performance

Active Publication Date: 2022-08-09
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Purpose of the invention: Aiming at the deficiencies and defects of the prior art, the present invention provides a high-efficiency rare earth modified fluoride removal material and its preparation method. , Rare earth salts as raw materials, the positive charges enriched on the surface of magnesium oxide modified by quaternary ammonium salts attract fluoride ions to gather and adsorb; the specific surface area and adsorption active sites are increased by the modification of rare earth chelates and overcome the loading of rare earth The disadvantage of insufficient stability of the element; the carboxyl functional group of the carboxyl chelating agent is modified into a group with an amino group through an organic amine source, and the protonation of the amino group electrostatically attracts fluorine ions to enhance the defluorination performance

Method used

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  • Efficient rare earth modified defluorination material and preparation method thereof
  • Efficient rare earth modified defluorination material and preparation method thereof
  • Efficient rare earth modified defluorination material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] The high-efficiency rare earth modified fluorine removal material and the preparation method thereof of the present embodiment include the following steps:

[0037] 1) At 25°C, weigh 10g of magnesium sulfate, 2g of urea and 10g of water, add them to the pressure reaction kettle and mix, then react at 110°C for 10h under a sealed condition, cool to room temperature, filter, and wash the filter cake by centrifugation 3 times with water, Dry at 60°C for 12h to obtain magnesium carbonate;

[0038] 2) At 25°C, weigh 1g of magnesium carbonate, 0.01g of cetyltrimethylammonium bromide and 5g of water into the reaction kettle, stir for 10h, filter, and dry the filter cake at 60°C for 12h, dry and grind it into powder. Placed in a tube furnace and heated to 500°C at a heating rate of 0.1°C / min, and then annealed to room temperature for 5 hours to obtain positively charged magnesium oxide;

[0039] 3) At 25°C, weigh 1g of lanthanum nitrate, 40g of water and 0.3g of Octapa chelati...

Embodiment 2

[0044] The high-efficiency rare earth modified fluorine removal material and the preparation method thereof of the present embodiment include the following steps:

[0045] 1) At 25°C, weigh 10g of magnesium nitrate, 3g of urea and 15g of water, add them to the pressure reaction kettle and mix, then react at 100°C for 12h under a sealed condition, cool to room temperature, filter, and centrifuge the filter cake with water for 5 times, Dry at 70°C for 11h to obtain magnesium carbonate;

[0046] 2) At 25°C, weigh 1g of magnesium carbonate, 0.02g of cetyltrimethylammonium chloride and 10g of water into the reaction kettle, stir for 12h, filter, dry the filter cake at 80°C for 10h, and dry it into powder. Placed in a tube furnace and heated to 500°C at a heating rate of 0.5°C / min, and then annealed to room temperature for 5 hours to obtain positively charged magnesium oxide;

[0047] 3) At 25°C, weigh 1g of lanthanum acetate, 50g of water and 0.35g of Pypa chelating agent, add it ...

Embodiment 3

[0052] The high-efficiency rare earth modified fluorine removal material and the preparation method thereof of the present embodiment include the following steps:

[0053] 1) At 25°C, weigh 10g of magnesium acetate, 2g of urea and 20g of water, add them into a pressure reactor and mix well, then react at 110°C for 10h under a sealed condition, cool down to room temperature, filter, and centrifuge the filter cake with water for 5 times, Dry at 60°C for 12h to obtain magnesium carbonate;

[0054] 2) At 25°C, weigh 1g of magnesium carbonate, 0.03g of cetyltrimethylammonium chloride and 5g of water, add them to the reaction kettle, stir for 12h, filter, and dry the filter cake at 60°C for 12h, and grind it into powder. Placed in a tube furnace and heated to 600°C at a heating rate of 1°C / min, and then annealed to room temperature for 6 hours to obtain positively charged magnesium oxide;

[0055] 3) At 25°C, weigh 1g of cerium nitrate, 40g of water and 0.4g of DOTA chelating agent...

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Abstract

The invention provides an efficient rare earth modified defluorination material which is an adsorbent prepared by surface reaction of an amine functionalized rare earth chelate and positively charged magnesium oxide, and the content of the amine functionalized rare earth chelate is 10-25 wt.%. Meanwhile, the invention discloses a preparation method of the material. The preparation method comprises the following steps: 1) preparing magnesium carbonate; 2) preparing positively charged magnesium oxide; (3) preparing a rare earth chelate; (4) preparing an amine functionalized rare earth chelate; and (5) preparing the efficient rare earth modified defluorination material. According to the invention, the low-concentration fluorine-containing wastewater or underground water can be reduced to below 1mg/L of the national drinking water standard, and the fluorine removal requirement of the low-concentration fluorine-containing water can be met even under the influence of some complex environments.

Description

technical field [0001] The invention relates to the technical field of groundwater and low-concentration fluorine-containing wastewater treatment, in particular to a high-efficiency rare earth modified fluorine-removing material and a preparation method thereof. Background technique [0002] Fluorine is a common chemical element on the earth, widely found in nature, including fluorite, phosphate rock, cryolite and other minerals, so fluoride ions often seep into groundwater. In the industry, fluorine minerals are often used as raw materials to prepare chemical products. The wastewater discharged by the industry often contains a large amount of fluoride. Although the state stipulates that the fluoride ion discharge standard in industrial wastewater should be less than 10mg / L, it still cannot meet the drinking water standard. If the concentration of fluoride ions in drinking water exceeds the standard, it will lead to symptoms of fluorosis such as osteoporosis. Therefore, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C01F5/24C01F5/06C02F101/14
CPCB01J20/223B01J20/041C02F1/28C01F5/06C01F5/24C02F2101/14Y02W10/37
Inventor 周钰明章强姚清照陈婉莹张帆利卜小海王泳娟
Owner SOUTHEAST UNIV
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