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Lignin-based porous carbon material and preparation method thereof

A porous carbon material and lignin-based technology, which is applied in the treatment of heavy metal-polluted wastewater, porous carbon materials and its preparation, can solve problems such as equipment environmental damage, heavy metal pollution, and development restrictions, and achieve mitigation of impact and strong adsorption , good operational effect

Inactive Publication Date: 2013-08-21
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these preparation methods have a certain industrial production scale, there are still many problems, such as the introduction of heavy metals, the improper follow-up treatment will cause serious pollution of heavy metals to the environment; a large amount of acid and alkali are consumed in the preparation process, and it is difficult to avoid damage to equipment. , environmental damage; the production of activated carbon in my country is mainly based on wood, and my country is a country that is not rich in wood resources, and its development is limited by wood resources to a certain extent

Method used

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  • Lignin-based porous carbon material and preparation method thereof
  • Lignin-based porous carbon material and preparation method thereof
  • Lignin-based porous carbon material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Take 500g of bagasse, dry it in an oven at 80°C for 12 hours, put it into a ball mill and grind it to 60 mesh, add 5000ml of ethanol, put it in an autoclave and cook it at 180°C for 6 hours, filter to remove insoluble matter, and evaporate the filtrate After concentration and drying, ethanol lignin can be obtained; take 80g of ethanol lignin and put it into a muffle furnace for pre-carbonization treatment to obtain a carbonized intermediate. In the ceramic tube of the tube furnace, an inert atmosphere of argon is introduced as a protective gas. After the air is exhausted, the temperature is raised to 850°C at a heating rate of 15°C / min, and the secondary carbonization is performed for 4 hours. After the reaction is over, keep the argon flowing continuously, let it cool to ambient temperature, wash the product twice with 30% hydrochloric acid, then wash five times with distilled water, and then dry at 100°C for 16 hours to obtain a black powdery woody Plain-based porous ...

Embodiment 2

[0029] Take 300g of bagasse, dry it in an oven at 90°C for 18 hours, put it into a ball mill and pulverize it, take the fraction below 60 mesh, add 4000ml of ethanol, put it in an autoclave and cook it at 200°C for 5 hours, filter to remove insoluble matter , take the filtrate to evaporate, concentrate and dry to obtain ethanol lignin; take 50g of ethanol lignin, put it into a muffle furnace for pre-carbonization treatment to obtain a carbonized intermediate, the pre-carbonization treatment temperature is 250°C, and the time is 180min; take the carbonized intermediate Place it in a ceramic tube of a high-temperature tube furnace, and pass in an inert atmosphere of nitrogen as a protective gas. After the air is exhausted, the temperature is raised to 950°C at a heating rate of 10°C / min, and the secondary carbonization treatment is performed for 3 hours. After the reaction is finished, keep nitrogen flowing continuously, let it cool to ambient temperature, wash the product with 3...

Embodiment 3

[0032] Take 800ml of papermaking black liquor, add sulfuric acid, adjust its pH value to 2.0~2.5, wait for the precipitation of the precipitate, collect the precipitate, filter, wash repeatedly with distilled water until the pH is neutral, put it in an oven and dry at 100°C to obtain Alkali lignin; take 10g of the obtained alkali lignin and put it into a muffle furnace for pre-carbonization treatment to obtain a carbonized intermediate. The pre-carbonization treatment temperature is 280°C and the time is 160min; take the carbonized intermediate and place it in a high-temperature tube furnace ceramic tube , into an inert atmosphere of argon as a protective gas, after the air is exhausted, the temperature is raised to 1000°C at a rate of 20°C / min, and the secondary carbonization treatment is performed for 2 hours. After the reaction is finished, keep the argon flowing continuously, let it cool to ambient temperature, wash the product twice with 35% dilute sulfuric acid, wash thre...

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Abstract

The invention discloses a lignin-based porous carbon material and a preparation method of the lignin-based porous carbon material. The aperture of the lignin-based porous carbon material is not larger than 300nm, the specific surface area is 628.3 to 762.5m<2> / g, and the pore volume is 0.16 to 0.23cm<3> / g. The preparation method comprises the following steps of: with biomass resource lignin as the initial raw material, pre-carbonizing at a low temperature to obtain a carbonized intermediate; and then quickly heating and carbonizing under the protection of inert atmosphere in a high-temperature furnace to obtain the lignin-based porous carbon material; and the lignin-based porous carbon material shows outstanding capacity of absorbing heavy metal ions in wastewater. According to the preparation method, the biomass resource is adopted and used as raw material, environmentally hazardous chemicals such as ZnCl2, strong acid and strong base are not used in the whole preparation process; the preparation method has low requirement to equipment, has the green chemical characteristics of environmental friendliness, low cost, outstanding performance, etc., is suitable for mass production, and is beneficial to treatment and control of metal-polluted wastewater and relief of pressure of papermaking black liquid to the environment.

Description

technical field [0001] The invention relates to the technical field of porous materials, in particular to a porous carbon material and a preparation method thereof, which can be applied to the treatment of heavy metal polluted wastewater. Background technique [0002] Due to its large specific surface area and strong adsorption capacity, porous materials are widely used in various industrial occasions, such as air purification, exhaust adsorption of sewage treatment plants, beverage water treatment, power plant water pretreatment, wastewater recovery pretreatment, Biological wastewater treatment, toxic wastewater treatment, petrochemical non-alkali sweetening, catalytic carrier, energy storage, and preparation of new materials have attracted people's close attention. [0003] Activated carbon is a kind of non-polar adsorbent, and it is a kind of porous carbon commonly used. Its appearance is dark black, and its main constituent element is carbon. High temperature, high pres...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B31/08C01B32/05C01B32/324
Inventor 李志礼葛圆圆肖多
Owner GUANGXI UNIV
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