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A kind of preparation method of three-dimensional flower-like mg-al-ldhs material

A mg-al-ldhs, three-dimensional flower-like technology, applied in the direction of electrolysis components, electrolysis process, etc., can solve the problems of enlarged particle size range, incomplete product structure, uneven particle distribution, etc., and achieves simple preparation method and large specific surface area. , Easy to operate effect

Active Publication Date: 2022-08-05
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] With the increasing application of Mg-Al-LDHs, the requirements for the material are getting higher and higher, and the traditional preparation methods have certain deficiencies, such as the co-precipitation method, although the operation is simple, but the crystal nucleation process and The crystallization process is carried out at the same time, causing the particle size range to expand and the particle distribution to be uneven; the roasting reduction method has higher requirements on the roasting temperature. If the roasting temperature is not suitable, it will directly affect the degree of reduction of the product, resulting in an incomplete product structure; in order to better To control the structure, morphology and particle size of materials, the synthesis method of Mg-Al-LDHs is constantly being explored and optimized

Method used

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  • A kind of preparation method of three-dimensional flower-like mg-al-ldhs material

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Dissolve magnesium chloride and aluminum chloride in water, then add polyethylene glycol to make a mixed solution; in the mixed solution, by mass ratio magnesium chloride: aluminum chloride=2, the total concentration of magnesium chloride and aluminum chloride is 0.1 mol / L, and the poly The concentration of ethylene glycol is 0.2g / / L;

[0045] The mixed solution was ultrasonically dispersed under stirring conditions for 30 minutes to prepare a pretreatment solution;

[0046] The pH value of the pretreatment solution is adjusted at 5 with hydrochloric acid to prepare an acid treatment solution;

[0047]The adopted electrolytic cell is provided with a cation exchange membrane to separate the inside of the electrolytic cell into a cathode area and an anode area. The cathode area and the anode area are respectively provided with a cathode plate and an anode plate. The cathode plate and the anode plate are respectively connected with the negative electrode and the positive e...

Embodiment 2

[0052] The method is the same as in Example 1, except that:

[0053] (1) magnesium chloride by mass ratio in the mixed solution: aluminum chloride=3, the total concentration of magnesium chloride and aluminum chloride is 0.3mol / L, and the concentration of polyethylene glycol is 0.4g / / L;

[0054] (2) ultrasonic dispersion treatment for 18min;

[0055] (3) Adjust the pH value to 5.5;

[0056] (4) The current density of the cathode plate during the electrodeposition reaction is 0.03A / cm 2 Reaction time 1h;

[0057] (5) The specific surface area of ​​the three-dimensional flower-like Mg-Al-LDHs material is 87 m 2 / g;

[0058] Using the above three-dimensional flower-like Mg-Al-LDHs materials for Pb 2+ Solution adsorption test, Pb 2+ solution of Pb 2+ Concentration 0.2g / L, adsorption time 1h, Pb 2 The adsorption amount was 1047.36 g / L.

Embodiment 3

[0060] The method is the same as in Example 1, except that:

[0061] (1) magnesium chloride by mass ratio in the mixed solution: aluminum chloride=5, the total concentration of magnesium chloride and aluminum chloride is 0.5mol / L, and the concentration of polyethylene glycol is 0.6g / / L;

[0062] (2) ultrasonic dispersion treatment for 12min;

[0063] (3) Adjust the pH value at 6;

[0064] (4) The current density of the cathode plate during the electrodeposition reaction is 0.05A / cm 2 Reaction time 0.5h;

[0065] (5) The specific surface area of ​​the three-dimensional flower-like Mg-Al-LDHs material is 84 m 2 / g;

[0066] Using the above three-dimensional flower-like Mg-Al-LDHs material for Pb 2+ Solution adsorption test, Pb 2+ solution of Pb 2+ Concentration 0.2g / L, adsorption time 1h, Pb 2+ The adsorption amount was 1087.26 g / L.

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Abstract

A method for preparing a three-dimensional flower-shaped Mg-Al-LDHs material is carried out according to the following steps: (1) dissolving magnesium chloride and aluminum chloride in water, adding polyethylene glycol to prepare a mixed solution; (2) ultrasonicating under stirring conditions (3) adjust pH value; (4) place in electrolytic cell, carry out direct current electrodeposition reaction; (5) filter, solid-phase washing, alcohol washing, drying, make three-dimensional flower-shaped Mg-Al-LDHs material. In the invention, the Mg-Al-LDHs material is directly prepared by the electrolytic deposition of the inorganic salt solution, the preparation method is simple, the process is short, and the operation is easy; 2+ The adsorption capacity is above 1000mg / g.

Description

technical field [0001] The invention belongs to the technical field of inorganic material preparation, and particularly relates to a preparation method of a three-dimensional flower-shaped Mg-Al-LDHs material. Background technique [0002] LDHs is a layered double metal hydroxide composite material, also known as hydrotalcite-like, its general structure is [M 2+ 1- x M 3+ x (OH) 2 ] x+ (A n- ) x / n ·mH 2 O, where M 2+ and M 3+ are divalent and trivalent metal ions, respectively, A n- is an interlayer anion with n negative charges, with excellent properties such as exchangeability, structural memory and thermal stability, x is M in each LDHs 3+ The atomic number of , m is the number of crystal water carried. [0003] Mg-Al-LDHs is a typical magnesium-aluminum double-layer hydroxide. Its unique structure and properties are more and more widely used and studied. It has excellent properties in catalysis, medicine, flame retardancy, pigment adsorption and heavy metal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/20C25B1/01
CPCC25B1/20C25B1/00
Inventor 狄跃忠马广超沈自强彭建平王耀武
Owner NORTHEASTERN UNIV LIAONING