Method for preparing iron-aluminum hydrotalcite through sacrificial anode method

A sacrificial anode, hydrotalcite technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of forming influence, forming other products, unable to obtain Fe/Al-LDHs, etc., achieving mild reaction, simple operation, easy to save energy The effect of reducing consumption

Inactive Publication Date: 2019-02-01
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Whether Fe / Al-LDHs is synthesized by urea hydrothermal method or co-precipitation method, in the preparation process, different Fe 2+ / Fe 3+ and different OH - The content of Fe / Al-LDHs will affect the formation of Fe / Al-LDHs. If the relevant parameters are not precisely controlled, other products may be formed, and Fe / Al-LDHs cannot be obtained.

Method used

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  • Method for preparing iron-aluminum hydrotalcite through sacrificial anode method
  • Method for preparing iron-aluminum hydrotalcite through sacrificial anode method

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Effect test

Embodiment 1

[0025] A kind of sacrificial anode one-step method for preparing Fe / Al-LDHs, comprises the following steps:

[0026] 1) Completely dissolve the electrolyte (sodium sulfate, sodium chloride or sodium bicarbonate) in water so that the electrolyte concentration is 1-2g / L to obtain an electrolyte solution;

[0027] 2) Connect the iron metal electrode and the aluminum metal electrode to bipolar or monopolar connection, place them in the electrolytic cell, and connect them to a DC power supply;

[0028] 3) Add the electrolyte solution in step 1) into the electrolytic cell, and fully stir evenly, then turn on the power, and carry out the electrolytic reaction for 10-60 minutes;

[0029] 4) After the electrolysis is completed, pour the solution in step 3) into the sedimentation tank, let it stand for 10-60min, and then control the rotation speed to be 1000-6000r / min for centrifugation for 3min, and wash the floc precipitate with water for 3-5 times, then Put it in a freeze dryer and ...

Embodiment 2

[0038] A preparation method for one-step synthesis of Fe / Al-LDHs material by a sacrificial anode method, specifically comprising:

[0039] 1) Dissolve the electrolyte sodium sulfate in water, and dissolve completely, and its concentration is 1-2g / L;

[0040] 2) Two DC power supplies are used to respectively control the magnitude of the current during electrolysis of two metal plates (two iron and aluminum plates). Connected state, during the electrolysis process, the current density is 5-50A / m 2 , and the current ratio of iron and aluminum electrodes is controlled to be 2:3-2:1, and the ratio of iron ions and aluminum ions to be electrolyzed is 1-3;

[0041] 3) Pour the electrolytic solution obtained in the above 1) into the reaction device described in 2), turn on the power supply, and the current density during the electrolysis process is 5-50A / m 2 Fully stir evenly, react for 10-60 minutes, the length of electrolysis time determines the amount of electrolytic metal;

[0...

Embodiment 3

[0053] A preparation method for one-step synthesis of Fe / Al-LDHs material by a sacrificial anode method, specifically comprising:

[0054] 1) Dissolve the sodium chloride electrolyte in water, and dissolve it completely, and its concentration is 1-2g / L;

[0055] 2) Only one DC power supply is used to control the magnitude of the output current during the electrolysis process of two metals (two pieces of iron and aluminum). electrode, the cathode is connected to the aluminum electrode), the current density is 5-50A / m 2 , the electrode spacing is 1-3cm, and the bottom of the electrolytic cell needs to be kept connected;

[0056] 3) Pour the electrolytic solution obtained in the above 1) into the reaction device described in 2), turn on the power supply, and the current density during the electrolysis process is 5-50A / m 2 Fully stir evenly, react for 10-60 minutes, the length of electrolysis time determines the amount of electrolytic metal;

[0057] 4) After the electrolysis i...

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Abstract

The invention relates to a method for preparing iron-aluminum hydrotalcite through a sacrificial anode method. The method for preparing the iron-aluminum hydrotalcite comprises the steps that an ironelectrode and an aluminum electrode are arranged in an electrolytic tank, an electrolyte solution in added into the electrolytic tank, then direct current is introduced for an electrolysis reaction, and after precipitation and drying, the iron-aluminum hydrotalcite is obtained. Compared with the prior art, the iron electrode and aluminum electrode are used as anodes, the iron-aluminum hydrotalciteis prepared through the one-step reaction by means of the sacrificial anode method, ompared with a commonly used coprecipitation method, metal salt is completely made from anodic dissolution, metal salt and strong alkali do not need to be added additionally, the anaerobic environment does not need to be controlled, the pH of the solution does not need to be adjusted, the reaction is mild, the operation is simple, and a large amount of the high-purity iron-aluminum hydrotalcite can be prepared, and the method has good development prospect.

Description

technical field [0001] The invention belongs to the technical field of hydrotalcite, and relates to a method for preparing iron-aluminum hydrotalcite by a sacrificial anode method. Background technique [0002] Fe / Al-LDHs (iron-aluminum hydrotalcite) is a double-layer flake metal hydroxide. At present, there are two main methods for synthesizing Fe / Al-LDHs: one is urea hydrothermal method, and the other is co- Precipitation. The urea hydrothermal method is to contain metal ions (Al 3+ , Fe 2+ ) solution by adding a certain amount of urea and electrolyte ions (SO 4 2- , CO 3 2- , Cl - ), put the system into an autoclave, and after a long time of high-temperature and high-pressure reaction, use urea to slowly decompose and release ammonia to achieve the required amount of alkali, nucleate and grow. The method is characterized by low supersaturation of the system and large grain size of the product, which can generally reach the micron level, and the grain size is relat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00C25B11/04C25B15/00
CPCC25B1/00C25B11/04C25B15/00
Inventor 时鹏辉邱海俊杨玲霞钱怡君范金辰闵宇霖徐群杰
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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