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In-situ precipitation preparation method for geopolymer fluorine removal agent and application

A geopolymer and in-situ precipitation technology, which is applied in the direction of alkali metal compounds, chemical instruments and methods, water pollutants, etc., can solve problems that are difficult to apply to column separation technology, complicated preparation process, high raw material cost and production cost

Inactive Publication Date: 2018-12-07
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned adsorbents have certain conditions of use, the cost of raw materials and production costs are high, and the preparation process is complicated, and high-temperature calcination is required
The industrial removal of various ions in water generally adopts the column separation method that can be processed continuously, and the above-mentioned adsorbents are mostly powder, which is difficult to apply to the column separation process, which limits its industrial application range

Method used

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  • In-situ precipitation preparation method for geopolymer fluorine removal agent and application

Examples

Experimental program
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Effect test

Embodiment 1

[0035] (1) Preparation of tetravalent cerium salt solution: 6gCeCl 3 ·7H 2 O was dissolved in 90g of distilled water, and then 1.2g of 30% H 2 o 2 Add it dropwise to the above solution while stirring, and then let it stand for 1 hour to make it oxidize more thoroughly;

[0036] (2) Loading metal ions by in-situ precipitation method: 6g spherical geopolymer particles (particle size 75-300μm, specific surface area 68.26m 2 / g) dispersed in the tetravalent cerium salt aqueous solution of step (1), placed on a heating magnetic stirrer for loading for 1 hour (stirring speed 300rpm, heating temperature 30 degrees Celsius);

[0037] (3) Aging: the spherical geopolymer particles loaded with cerium ions in step (2) were stopped from stirring, and left to age for 2 hours;

[0038] (4) Washing: the product obtained in step (3) is washed several times with distilled water to remove chloride ions, excessive cerium ions and alkali introduced therein, and detect whether the washing is cl...

Embodiment 2

[0045] (1) Preparation of ferric salt solution: 30gFeCl3 ·6H 2 O was dissolved in 200g distilled water;

[0046] (2) Loading metal ions by in-situ precipitation method: 2g spherical geopolymer particles (particle size 150-800μm, specific surface area 46.58m 2 / g) dispersed in the ferric salt aqueous solution of step (1), placed on a heating magnetic stirrer for 0.5 hours to load (stirring speed 500rpm, heating temperature 45 degrees Celsius);

[0047] (3) Aging: Stop stirring the spherical geopolymer particles loaded with iron ions in step (2), and leave to age for 1 hour;

[0048] (4) washing: the product obtained in step (3) is washed several times with distilled water to remove chloride ions, excessive iron ions and alkali introduced therein, and detect whether the washing is clean (using silver ion method, ICP, atomic absorption spectrometry respectively Photometric method and pH meter are detected), and the pH of washing solution is controlled at 7-9 after washing;

[...

Embodiment 3

[0055] (1) Preparation of aluminum salt solution: 25gAlCl 3 ·6H 2 O was dissolved in 200g distilled water;

[0056] (2) Loading metal ions by in-situ precipitation method: 1.8g spherical geopolymer particles (particle size 150-300μm, specific surface area 10.37m 2 / g) dispersed in the aluminum salt aqueous solution of step (1), placed on a heating magnetic stirrer for 0.3 hours to load (stirring speed 600rpm, heating temperature 75 degrees Celsius);

[0057] (3) Aging: Stop stirring the spherical geopolymer particles loaded with aluminum ions in step (2), and then leave it to age for 0.5 hour;

[0058] (4) Washing: the product obtained in step (3) is washed several times with distilled water to remove chloride ions, excessive aluminum ions and alkali introduced therein, and detect whether the washing is clean (using silver ion method, ICP, atomic absorption spectrometry respectively Photometric method and pH meter detect), after washing, control the pH of the washing soluti...

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Abstract

The invention discloses an in-situ precipitation preparation method for a geopolymer fluorine removal agent. An alkali-activated geopolymer serves as a carrier, and metal ions are loaded onto geopolymer particles by adopting an in-situ precipitation method. The whole preparation process is simple in process and mild in conditions, no other additive is needed, a high-temperature calcining link is not needed, the preparative energy consumption is reduced, and the removal efficiency and production cost are taken into account. The experimental results show that the geopolymer fluorine removal agent prepared by in-situ precipitation has the characteristics of being uniform in coating, uniform in particle size, large in specific surface area, high in porosity, stable in mechanical property and the like, and direct packing is conveniently performed for conducting separating experiments; and the product has an excellent effect of adsorbing fluorine ions in water, the adsorbent failed after adsorption completion can be treated by utilizing a geopolymer curing mechanism, secondary pollution is avoided, and the product serving as a novel fluorine ion adsorbing material has wide prospects in the aspect of water treatment.

Description

technical field [0001] The invention belongs to the field of preparation of novel fluoride ion adsorption materials, and in particular relates to an in-situ precipitation preparation method and application of a geopolymer fluoride removal agent. Background technique [0002] Fluorine exists mostly in the form of inorganic compounds in nature, and most fluorides have certain solubility, are easily soluble in water, and have strong mobility. Fluorine is an essential trace element for the human body. Only when the fluorine content in water is 0.5-1.0mg / L is beneficial to the human body. When the fluorine content exceeds 1.5mg / L, it will cause certain harm to the human body. The World Health Organization strictly restricts daily drinking The fluorine content of water should not be higher than 1.5mg / L. At present, activated alumina, iron oxides, calcium oxides, magnesium oxides, zirconium oxides, rare earth metal oxides and composite metal oxides are mainly used as fluoride ion ...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/14
CPCB01J20/265B01J20/28016B01J20/3085C02F1/285C02F2101/14
Inventor 王开拓韦悦周陈凡崔学民王欣鹏邵琳
Owner GUANGXI UNIV
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