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Method for rapidly preparing chlorine ion intercalation cobalt-aluminum hydrotalcite

A technology of chloride ion and hydrotalcite, applied in chemical instruments and methods, cobalt compounds, inorganic chemistry, etc., to achieve the effect of simple and rapid preparation

Active Publication Date: 2018-01-09
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the traditional co-precipitation method cannot efficiently prepare chloride ion-intercalated cobalt-aluminum hydrotalcites, the present invention provides a rapid and effective method for preparing chloride-ion intercalated cobalt-aluminum hydrotalcites based on the co-precipitation method; the specific principle is to use acetic acid - The buffering effect of sodium acetate buffer solution can stabilize the pH value of the preparation system at 4.00-5.00, effectively avoiding CO in the environment 2 Efficient one-step preparation of CoAl-Cl-LDH based on the effect of dissolution on the prepared product

Method used

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  • Method for rapidly preparing chlorine ion intercalation cobalt-aluminum hydrotalcite
  • Method for rapidly preparing chlorine ion intercalation cobalt-aluminum hydrotalcite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Use a pipette to pipette 18.00±0.01 mL of 0.2 mol L -1 sodium acetate solution into a 100 mL volumetric flask, and then add 82.00±0.01 mL 0.2 mol L -1 acetic acid solution, shake it to make it evenly mixed, and make it into 100 mL pH=4.00±0.01 acetic acid-sodium acetate buffer solution.

[0036] (2) Weigh 8.57±0.01 g of cobalt chloride hexahydrate and 4.35±0.01 g of aluminum chloride hexahydrate, mix them into a beaker, add 90±1 mL of deionized water into the beaker, and stir with a magnetic stirrer for 10 min to dissolve it completely, the prepared solution ( c (Co 2+ )=0.40 mol L -1 , c (Al 3+ )=0.20 mol L -1) into a 250 mL hanging bottle infusion set for use.

[0037] (3) Weigh 4.00±0.01 g of sodium hydroxide into a beaker, add a small amount of deionized water into the beaker, and stir with a magnetic stirrer for 10 min to completely dissolve it. Transfer the dissolved solution to a 100 mL volumetric flask to make 1.00mol L -1 sodium hydroxide aqueou...

Embodiment 2

[0042] (1) Pipette 49.00±0.01 mL 0.2 mol L -1 sodium acetate solution into a 100 mL volumetric flask, and then add 51.00±0.01 mL 0.2mol L -1 acetic acid solution, shake it to make it evenly mixed, and make it into 100 mL pH=4.60±0.01 acetic acid-sodium acetate buffer solution.

[0043] (2) Weigh 21.41±0.01 g of cobalt chloride hexahydrate and 7.24±0.01 g of aluminum chloride hexahydrate, mix them into a beaker, add 100±1 mL of deionized water into the beaker, and stir with a magnetic stirrer for 10 min to dissolve it completely, the prepared solution ( c (Co 2+ )=0.90 mol L -1 , c (Al 3+ )=0.30 mol L -1 ) into a 250 mL hanging bottle infusion set for use.

[0044] (3) Weigh 4.00±0.01 g of sodium hydroxide into a beaker, add a small amount of deionized water into the beaker, and stir with a magnetic stirrer for 10 min to completely dissolve it. Transfer the dissolved solution to a 100 mL volumetric flask to make 1.00mol L -1 sodium hydroxide aqueous solution, and th...

Embodiment 3

[0049] (1) Use a pipette to pipette 70.00±0.01 mL of 0.2 mol L -1 sodium acetate solution into a 100 mL volumetric flask, and then add 30.00±0.01 mL 0.2 mol L -1 acetic acid solution, shake it to make it evenly mixed, and make it into 100 mL pH=5.00±0.01 acetic acid-sodium acetate buffer solution.

[0050] (2) Weigh 28.55±0.01 g of cobalt chloride hexahydrate and 7.24±0.01 g of aluminum chloride hexahydrate, mix them into a beaker, add 120±5 mL of deionized water into the beaker, and stir with a magnetic stirrer for 10 min to dissolve it completely, the prepared solution ( c (Co 2+ )=1.00 mol L -1 , c (Al 3+ )=0.25 mol L -1 ) into a 250 mL hanging bottle infusion set for use.

[0051] (3) Weigh 4.00±0.01 g of sodium hydroxide into a beaker, add a small amount of deionized water into the beaker, and stir with a magnetic stirrer for 10 min to completely dissolve it. Transfer the dissolved solution to a 100 mL volumetric flask to make 1.00mol L -1 sodium hydroxide aqu...

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Abstract

The invention discloses a method for rapidly preparing chlorine ion intercalation cobalt-aluminum hydrotalcite. According to the method disclosed by the invention, the pH (Potential of Hydrogen) valueof a preparation system is stably controlled to 4.00 to 5.00 by utilizing an acetic acid-sodium acetate buffering solution, cobalt chloride hexahydrate and aluminum chloride hexahydrate are used as raw materials, sodium hydroxide is used as a precipitant and de-ionized water is used as a solvent and a washing agent; the chlorine ion intercalation cobalt-aluminum hydrotalcite is prepared through the steps of preparing a solution, carrying out titration and co-precipitation, carrying out hydrothermal treatment, washing, extraction filtering and drying. The preparation method disclosed by the invention can be used for effectively avoiding influences that CO2 in the environment is dissolved to form CO3<2-> ions, and is a rapid preparation method of the pure-phase chlorine ion intercalation cobalt-aluminum hydrotalcite.

Description

technical field [0001] The invention belongs to the field of novel inorganic layered materials, and in particular relates to a method for rapidly and effectively preparing chloride ion intercalated cobalt-aluminum hydrotalcites based on controlling the pH of a synthesis system. Background technique [0002] Layered Double Hydroxides (LDHs for short) are layered double metal hydroxides with a layered crystal structure, composed of hydroxides of divalent and trivalent metal elements, and anions should be filled between the structural layers. Co-precipitation method is the main preparation method of LDHs, because the preparation process is usually carried out in an open system, and the CO in the environmental system 2 It is often unavoidably dissolved into the solution system and transformed into carbonate with stronger laminate binding force and preferentially enters the interlayer of the hydrotalcite-like structure. Therefore, the traditional co-precipitation method usually p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00
Inventor 吴旭次超邹春蕾冯雅琳孟浩李哲
Owner TAIYUAN UNIV OF TECH
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