Method for preparing natural-cellulose based magnetic porous carbon and application of natural-cellulose based magnetic porous carbon

A natural cellulose and porous carbon technology, applied in chemical instruments and methods, other chemical processes, magnetic field/electric field shielding, etc., can solve the problems of magnetic porous carbon composite materials that have not been seen in literature and patent reports, and achieve excellent electromagnetic wave absorption The performance, equipment and process are simple, and the effect of realizing resource utilization

Inactive Publication Date: 2016-12-07
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are no literature and patent reports on the preparation of magnetic porous carbon composite materials from natural cellulose.

Method used

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  • Method for preparing natural-cellulose based magnetic porous carbon and application of natural-cellulose based magnetic porous carbon
  • Method for preparing natural-cellulose based magnetic porous carbon and application of natural-cellulose based magnetic porous carbon
  • Method for preparing natural-cellulose based magnetic porous carbon and application of natural-cellulose based magnetic porous carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A preparation method of magnetic porous carbon based on natural cellulose, comprising the following steps:

[0044] (1) Put 10 grams of cotton fiber in 500 mL of 1 mol / L sodium hydroxide solution, soak for 4 hours to hydrolyze and activate the cellulose, and then wash the activated cotton with distilled water until pH=7, Filter and dry to obtain activated cellulose;

[0045] (2) Submerge 5 grams of activated cellulose obtained in step (1) in 250 mL of nickel nitrate solution with a concentration of 0.5 mol / L, stir magnetically for 24 hours, filter, and heat and dry under normal pressure to obtain a cellulose / metal salt mixture Precursor;

[0046] (3) Put the cellulose / metal salt mixture precursor obtained in step (2) into the cleaned ark, place the ark at the center of the quartz tube of the tube furnace, continuously feed ammonia gas, and adjust the tube furnace so that It is heated up to 800°C at a rate of 10°C / min, kept for 4 hours, then naturally cooled to room te...

Embodiment 2

[0051] A preparation method of magnetic porous carbon based on natural cellulose, comprising the following steps:

[0052] (1) Put 10 grams of flax in 500 mL of lithium hydroxide solution with a concentration of 2 mol / L, soak for 12 hours to hydrolyze and activate the cellulose, then wash the activated flax with distilled water until pH = 7, filter , drying to obtain activated cellulose;

[0053] (2) Submerge 5 grams of activated cellulose obtained in step (1) in 250 mL of cobalt acetate solution with a concentration of 0.5 mol / L, ultrasonicate for 30 minutes, continue mechanical stirring for 4 hours, filter, and heat and dry under normal pressure to obtain cellulose / Metal salt mixture precursor;

[0054] (3) Put the cellulose / metal salt mixture precursor obtained in step (2) into the cleaned ark, place the ark at the center of the quartz tube of the tube furnace, continuously feed ammonia gas, and adjust the tube furnace so that It is heated up to 800°C at a rate of 10°C / m...

Embodiment 3

[0057] A preparation method of magnetic porous carbon based on natural cellulose, comprising the following steps:

[0058] (1) Put 10 grams of ramie in 250 mL of 1 mol / L potassium hydroxide solution and soak for 4 hours to remove impurities on the surface of ramie and activate the cellulose by hydrolysis, and then dehydrate the activated ramie with distilled water Ramie is washed to pH=7, filtered and dried to obtain activated cellulose;

[0059] (2) Submerge 5 grams of activated cellulose obtained in step (1) in 250 mL of ferric nitrate solution with a concentration of 0.5 mol / L, stir mechanically for 8 hours, filter, and heat and dry under normal pressure to obtain a cellulose / metal salt mixture Precursor;

[0060] (3) Put the cellulose / metal salt mixture precursor obtained in step (2) into the cleaned ark, place the ark at the center of the quartz tube of the tube furnace, continuously feed ammonia gas, and adjust the tube furnace so that It is heated up to 800°C at a rat...

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Abstract

The invention discloses a method for preparing natural-cellulose based magnetic porous carbon. The method comprises the steps: firstly, soaking natural cellulose into a strongly-alkaline solution, carrying out activation for 0.5 to 24 hours, then, carrying out water washing until the activated cellulose is neutral, carrying out filtering, carrying out drying, then, putting the activated cellulose into a metal salt solution with a catalytic action, carrying out stirring for 0.5 to 24 hours, carrying out filtering, and carrying out drying, so as to obtain a cellulose/metal salt mixture precursor; and calcining the obtained cellulose/metal salt mixture precursor for 0.5 to 12 hours at the temperature of 400 DEG C to 1,000 DEG C in a reducing atmosphere, naturally cooling the calcination product to room temperature, thereby obtaining the natural-cellulose based magnetic porous carbon. According to the method, the raw materials are cheap and readily available, the equipment and procedures are simple and are easy in operation, and the method is pollution-free, is low in cost and facilitates industrialized and large-scale production; and the prepared composite material has properties of both magnetic nano-metal materials and porous carbon materials, so that the requirements of wave absorbing materials on electromagnetic wave dissipation capability and impedance matching are excellently met, and the electromagnetic wave absorption property is excellent.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a preparation method and application of natural cellulose-based magnetic porous carbon. Background technique [0002] Cellulose is the most abundant renewable resource on the earth. Natural cellulose is cheap and easy to get, and its sources are extremely abundant. Its structure is β-(1→4)-anhydroglucose polymer. Because of its unique reaction function and molecular characteristics, such as non-toxic, safe, biodegradable, hydrophilic and semi-rigid, cellulose, cellulose composite modified materials and derivative products, in addition to traditional textile and papermaking In addition to industry, it is also used in food, daily chemical industry, medicine, construction, biochemistry and other fields. At the same time, the annual waste of various textiles in the world reaches 30 million tons, which is an astonishing amount. [0003] The traditional dispo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C01B31/02H05K9/00
CPCB01J20/20B01J20/28009B01J20/28085C01P2002/72C01P2002/82C01P2004/03C01P2004/04C01P2006/42C02F1/283H05K9/0081
Inventor 龚春红张经纬刘浩杰吕晓艳魏云刘胜超张治军
Owner HENAN UNIVERSITY
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