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Method for preparing manganese dioxide with multistage pore structure

A pore structure, manganese dioxide technology, applied in manganese oxide/manganese hydroxide and other directions, can solve the problems of large specific surface area, performance limitation, cumbersome process, etc., and achieve the effects of good repeatability, stable product quality and simple preparation method.

Inactive Publication Date: 2013-10-02
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the manganese dioxide prepared by these methods are granular or rod-shaped, which is limited in performance, and the multi-level pore structure is due to its large specific surface area, light density, large internal volume and high permeability. And attracted more attention, the current porous manganese oxide usually uses porous silicon oxide as a hard template, but this method is too cumbersome and not conducive to mass production

Method used

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  • Method for preparing manganese dioxide with multistage pore structure
  • Method for preparing manganese dioxide with multistage pore structure

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Artemia egg shells were cleaned with distilled water, and after ball milling for 6 hours, they were washed with HCl with a concentration of 6mol / L and HCl with a concentration of 8mol / L. 2 SO 4 , 6mol / L HNO 3 , 2mol / L KOH soaking pretreatment, soaking time is 2h for each substance, drying to remove water; dissolving 0.1g CTAB in 80ml deionized water, adding 2g manganese acetate, adding 1.57g citric acid and 0.5g of the above The treated Artemia egg shells were stirred at 300 r / min at 50°C until gelatinous, and the pH was adjusted to 6 with ammonia water. Continue to raise the temperature of the gel-like solution to 60° C. and stir at constant temperature to form a wet gel. The obtained wet gel was dried in an oven at 80° C. for 12 hours to form a dry gel. Dry the xerogel at 160°C for 6 hours, remove Artemia eggshells with shelling solution (10% sodium hypochlorite), clean the shelling solution with deionized water, and dry at 80°C to obtain a multi-level pore structu...

Embodiment 2

[0020] Artemia egg shells were cleaned with distilled water, and after ball milling for 6 hours, they were washed with 10 mol / L HCl and 14 mol / L HCl respectively. 2 SO 4 , 10mol / L of HNO 3 , 4mol / L KOH soaking pretreatment, the soaking time is 4h for each substance, and dry to remove moisture; dissolve 0.4g p123 in 80ml deionized water, add 6g of manganese chloride, add 4g of citric acid and 3g of the above treatment after dissolving The dried Artemia egg shells were stirred at 50°C at 400r / min until gelatinous, and the pH was adjusted to 7 with ammonia water. Continue to raise the temperature of the gel-like solution to 70° C. and stir at constant temperature to form a wet gel. The obtained wet gel was dried in an oven at 80° C. for 12 hours to form a dry gel. Dry the xerogel at 180°C for 12 hours, remove Artemia eggshells with shelling solution (10% sodium hypochlorite), clean the shelling solution with deionized water, and dry at 80°C to obtain a multi-level pore structu...

Embodiment 3

[0022] Clean Artemia egg shells with distilled water, and after ball milling for 6 hours, use HCl with a concentration of 12mol / L and HCl with a concentration of 18mol / L respectively. 2 SO 4 , 12mol / L HNO 3 , 6mol / L KOH soaking pretreatment, soaking time is 6h for each substance, and drying to remove water; dissolve 1g F127 in 80ml deionized water, add 10g manganese acetate, add 7.84g citric acid and 5g of the above-mentioned treated Artemia egg shells were stirred at 50°C at 500r / min until a gel was formed, and the Ph was adjusted to 8 with ammonia water. Continue to raise the temperature of the gel-like solution to 80° C. and stir at constant temperature to form a wet gel. The obtained wet gel was dried in an oven at 80° C. for 12 hours to form a dry gel. Dry the xerogel at 200°C for 24 hours, remove Artemia eggshells with shelling solution (10% sodium hypochlorite), clean the shelling solution with deionized water, and dry at 80°C to obtain a multi-level pore structure ...

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Abstract

The invention relates to a method for preparing manganese dioxide with a multistage pore structure. According to the method, a surfactant is taken as a soft diaphragm plate, artemia cyst shell is taken as a hard diaphragm plate, manganese metal salt is taken as a precursor, citric acid is taken as a chelating agent, a wet jello is prepared through a sol-gel method, after the obtained wet jello is baked at 160-200 DEG C, the artemia cyst shell hard diaphragm plate is removed by a decladding solution, then the MnO2 material with the multistage pore structure is obtained. The method has low cost and a simple technology, is easy to control, and has good repeatability, the quality of the product is stable, and the method can be widely used in fields such as lithium ion batteries, super capacitors, and the like.

Description

technical field [0001] The invention belongs to the technical field of functional materials, in particular to a method for preparing metal oxides. Background technique [0002] transition metal oxide MnO 2 Widely used in lithium-ion batteries, super capacitors and other fields. At present, the synthesis methods of manganese dioxide mainly include co-precipitation method, sol-gel method, electrodeposition method and so on. However, most of the manganese dioxide prepared by these methods are granular or rod-shaped, which is limited in performance, and the multi-level pore structure is due to its large specific surface area, light density, large internal volume and high permeability. And attracted more attention, the current porous manganese oxide usually uses porous silicon oxide as a hard template, but this method is too cumbersome and not conducive to mass production. The invention adopts the natural biological template Artemia eggshell as a hard template, which greatly s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02
Inventor 赵玉峰冉伟高发明
Owner YANSHAN UNIV
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