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Spherical hydrotalcite material of multi-stage structure, and preparation method and defluorination application thereof

A technology of structured water and hydrotalcite, applied in chemical instruments and methods, water pollutants, and other chemical processes, can solve the problems of limitations and small adsorption capacity, and achieve excellent pore structure, large specific surface area, and simple preparation process Effect

Inactive Publication Date: 2017-10-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrotalcite materials have been reported in the prior art to adsorb fluoride ions in water. For example, an aluminum-modified hydrotalcite defluoridation adsorbent preparation method invented by Peng Xianjia of the Eco-Environmental Research Center of the Chinese Academy of Sciences (patent application number 201210560556.7) reported an aluminum The adsorption of hydrotalcite powder materials modified by acid salt or metaaluminate to fluoride ion in water has a maximum adsorption capacity of 7.6 mg / g, which is small and limited in practical application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of Zn(NO 3 ) 2 , Mg(NO 3 ) 2 and Al(NO 3 ) 3 A mixed salt solution in which Zn 2+ and Mg 2+ The sum of moles and Al 3+ The molar ratio of Zn is 2:1, Zn 2+ and Mg 2+ The molar ratio of Zn is 2:3, Zn 2+ The concentration is 0.005mol / L; prepare a urea solution with a concentration of 0.1mol / L; at room temperature, add 50mL urea solution to 200mL mixed salt solution, stir for 40min, transfer the slurry to a polytetrafluoroethylene reactor, and Hydrothermal crystallization at ℃ for 5 days, then washing with water, filtering, and drying the obtained micron-sized spherical ternary zinc-magnesium-aluminum hydrotalcite precursor;

[0023] (2) Place the micron-sized spherical ternary zinc-magnesium-aluminum hydrotalcite precursor prepared in step (1) in a tube furnace, and roast at 350° C. for 4 hours in a nitrogen atmosphere, and obtain ZnMgAl-LDO after cooling;

[0024] (3) Preparation of Zn(NO 3 ) 2 Mixed solution with hexamethylenetetramine, where...

Embodiment 2

[0028] (1) Preparation of Zn(NO 3 ) 2 , Mg(NO 3 ) 2 and Al(NO 3 ) 3 A mixed salt solution in which Zn 2+ and Mg 2+ The sum of moles and Al 3+ The molar ratio of Zn is 3:1, Zn 2+ and Mg 2+ The molar ratio of Zn is 1:9, Zn 2+ The concentration is 0.001mol / L; prepare a urea solution with a concentration of 0.5mol / L; at room temperature, add 10mL urea solution to 100mL mixed salt solution, stir for 20min, transfer the slurry to a polytetrafluoroethylene reactor, and Hydrothermal crystallization at ℃ for 10 days, then washing with water, filtering, and drying the obtained micron-sized spherical ternary zinc-magnesium-aluminum hydrotalcite precursor;

[0029] (2) Place the micron-sized spherical ternary zinc-magnesium-aluminum hydrotalcite precursor prepared in step (1) in a tube furnace, and roast at 450° C. for 5 hours in a nitrogen atmosphere, and obtain ZnMgAl-LDO after cooling;

[0030] (3) Preparation of Mg(NO 3 ) 2 Mixed solution with hexamethylenetetramine, in w...

Embodiment 3

[0034] (1) Preparation of Zn(NO 3 ) 2 , Mg(NO 3 ) 2 and Al(NO 3 ) 3 A mixed salt solution in which Zn 2+ and Mg 2+ The sum of moles and Al 3+ The molar ratio of Zn is 4:1, Zn 2+ and Mg 2+ The molar ratio of Zn is 4:9, Zn 2+ The concentration is 0.01mol / L; prepare a urea solution with a concentration of 1mol / L; at room temperature, add 100mL urea solution to 500mL mixed salt solution, stir for 60min, transfer the slurry to a polytetrafluoroethylene reactor, Under hydrothermal crystallization for 8 days, then washed with water, filtered, and dried to obtain the micron-sized spherical ternary zinc-magnesium-aluminum hydrotalcite precursor;

[0035] (2) Place the micron-sized spherical ternary zinc-magnesium-aluminum hydrotalcite precursor prepared in step (1) in a tube furnace, and roast it at 500° C. for 10 hours in a nitrogen atmosphere, and obtain ZnMgAl-LDO after cooling;

[0036] (3) Preparation of Ni(NO 3 ) 2 Mixed solution with hexamethylenetetramine, in which...

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PUM

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Abstract

The invention provides a hydrotalcite material of a multi-stage structure, and a preparation method and application thereof to adsorption of fluorinions in water. According to the method, firstly, ternary zinc magnesium and aluminum spherical spherical hydrotalcite precursors are prepared and are roasted; then, products obtained through roasting are respectively added into a solution of magnesium nitrate, nickel nitrate and zinc nitrate; secondary growth of hydrotalcite is realized on the surface; the hydrotalcite material of the multi-stage structure is obtained; finally, the obtained spherical material is roasted and is used for the adsorption removal of fluorinion in the water. The material of the multi-stage structure has the excellent hole structures and great specific surface area; wide application prospects are realized in the adsorption removal aspect of contaminants.

Description

technical field [0001] The invention belongs to the technical field of nanometer material preparation, and in particular relates to a multi-level structure hydrotalcite material, a preparation method thereof and an application for absorbing fluorine ions in water. Background technique [0002] Hydrotalcite compounds include hydrotalcites and hydrotalcite-like compounds, and their main laminates are mainly composed of hydroxides of two metals, so they are also called layered double hydroxides (LDH for short) , its most classic structural features are: nano-scale two-dimensional layered longitudinal orderly arrangement to form a three-dimensional crystal structure, the metal elements of the layers are mainly magnesium and aluminum, and the atoms are covalently bonded; there are anions between the layers, and Weak chemical bonds, such as ionic bonds, hydrogen bonds, etc., are connected to the main laminate. The laminate skeleton has a positive charge, and the anions between th...

Claims

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Application Information

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IPC IPC(8): B01J20/08B01J20/28B01J20/30C02F1/28C02F101/14
CPCB01J20/0244B01J20/041B01J20/08B01J20/28019B01J20/28054C02F1/281C02F2101/14
Inventor 宋宇飞陈伟成瑶孔显刚
Owner BEIJING UNIV OF CHEM TECH
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