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Lignin-based hierarchical porous carbon for rapidly purifying dye wastewater and preparation method of lignin-based hierarchical porous carbon

A lignin-based, dye-based wastewater technology, applied in chemical instruments and methods, inorganic chemistry, water pollutants, etc., can solve the problems of not meeting the needs of use, insufficient adsorption capacity, complicated preparation process, etc., to achieve high value The effect of utilization, low price and wide source

Active Publication Date: 2021-08-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The adsorption capacity of the lignin-based hierarchical porous carbon adsorbent is not high enough, and the maximum adsorption capacity for sulfamethazine in water is only 759 mg / g
[0010] It can be seen that the lignin-based adsorbents reported in the published literature have disadvantages such as complex preparation process, small specific surface area, low adsorption capacity, and low adsorption efficiency, which still cannot meet the needs of use.

Method used

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  • Lignin-based hierarchical porous carbon for rapidly purifying dye wastewater and preparation method of lignin-based hierarchical porous carbon
  • Lignin-based hierarchical porous carbon for rapidly purifying dye wastewater and preparation method of lignin-based hierarchical porous carbon
  • Lignin-based hierarchical porous carbon for rapidly purifying dye wastewater and preparation method of lignin-based hierarchical porous carbon

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Experimental program
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Effect test

Embodiment 1

[0039] Preparation steps of lignin-based hierarchical porous carbon:

[0040](1) Dissolve enzymatic lignin in potassium hydroxide solution, stir evenly, evaporate and concentrate at 80°C for 2 hours to obtain a paste-like viscous mixture, wherein the concentration of potassium hydroxide solution is 25g / L, The mass ratio of potassium and enzymatic lignin is 1:10;

[0041] (2) Under a nitrogen atmosphere, place the concentrated potassium hydroxide / enzymatic lignin mixture in a tube furnace for high-temperature carbonization activation at a heating rate of 5°C / min to 200°C, and then Raise the temperature to 500°C at a heating rate of 1°C / min, then raise the temperature to 700°C at a heating rate of 2°C / min, and keep it for 0.5h to obtain a black carbon solid;

[0042] (3) The black carbon solid obtained in step (2) was first neutralized with 2% dilute hydrochloric acid, then washed with water until neutral, and dried at 105°C for 12 hours to obtain lignin-based hierarchical poro...

Embodiment 2

[0046] Preparation steps of lignin-based hierarchical porous carbon:

[0047] (1) Dissolve the organic solvent lignin in the potassium hydroxide solution, stir evenly, evaporate and concentrate at a temperature of 90°C for 4 hours to obtain a paste-like viscous mixture, wherein the concentration of the potassium hydroxide solution is 50g / L, and the hydrogen oxidized The mass ratio of potassium and organic solvent lignin is 1:5;

[0048] (2) Under nitrogen atmosphere, place the potassium hydroxide / organic solvent lignin mixture concentrated in step (1) in a tube furnace for high-temperature carbonization activation, and raise the temperature to 200° C. at a heating rate of 5° C. / min, and then Raise the temperature to 500°C at a heating rate of 1°C / min, and then raise the temperature to 800°C at a heating rate of 2°C / min, and keep it for 1 hour to obtain a black carbon solid;

[0049] (3) The black carbon solid obtained in step (2) was first neutralized with 2% dilute hydrochlo...

Embodiment 3

[0053] Preparation steps of lignin-based hierarchical porous carbon:

[0054] (1) Dissolve lignosulfonate in potassium hydroxide solution, stir evenly, evaporate and concentrate at a temperature of 100°C for 6 hours to obtain a paste-like viscous mixture, wherein the concentration of potassium hydroxide solution is 75g / L, hydrogen The mass ratio of potassium oxide and lignosulfonate is 3:10;

[0055] (2) Under a nitrogen atmosphere, place the potassium hydroxide / lignosulfonate mixture concentrated in step (1) in a tube furnace for high-temperature carbonization activation, and heat up to 200° C. at a heating rate of 5° C. / min. Then raise the temperature to 500°C at a heating rate of 1°C / min, and then raise the temperature to 800°C at a heating rate of 2°C / min, and keep it warm for 1.0h to obtain a black carbon solid;

[0056] (3) The black carbon solid obtained in step (2) was first neutralized with 2% dilute hydrochloric acid, then washed with water until neutral, and dried ...

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Abstract

The invention belongs to the technical field of effective utilization of low-value and waste biomass resources, and particularly discloses lignin-based hierarchical porous carbon for rapidly purifying dye wastewater and a preparation method of the lignin-based hierarchical porous carbon. The preparation method comprises the following steps: (1) dissolving lignin in a potassium hydroxide solution, uniformly conducting stirring, and conducting evaporating and concentrating to obtain a pasty thick potassium hydroxide / lignin mixture; (2) performing high-temperature carbonization and activation on the concentrated potassium hydroxide / lignin mixture in the step (1) in a nitrogen atmosphere to obtain a black carbon solid; and (3) conducting deacidification treatment, namely neutralizing the black carbon solid obtained in the step (2) with diluted hydrochloric acid, conducting washing with water until the black carbon solid is neutral, and conducting drying to obtain the lignin-based hierarchical porous carbon. The lignin-based hierarchical porous carbon prepared by the method disclosed by the invention has relatively high adsorption capacity and rapid removal capacity on anionic dyes and cationic dyes, and can realize rapid, efficient and universal adsorption of organic dyes in a water body.

Description

technical field [0001] The invention belongs to the technical field of effective utilization of low-value and waste biomass resources, and in particular relates to a lignin-based hierarchical porous carbon for rapid purification of dye wastewater and a preparation method thereof. Background technique [0002] There are more than 100,000 kinds of organic dyes being continuously produced and used in the industry. Organic dyes are widely used in important fields such as papermaking, plastics, leather, cosmetics and printing because of their excellent color rendering properties. If a large amount of harmful dye wastewater is discharged directly without treatment, it will pose a huge threat to the ecological environment and human health. Because organic dyes are very stable against solar radiation, microbial degradation, and oxidants, and are highly chromatic and toxic, dye wastewater is recognized as one of the most difficult pollutants to treat. Potential mutagenic and carcin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C01B32/318C01B32/348C02F101/30
CPCB01J20/20B01J20/3078B01J20/3085B01J20/3071C02F1/283C01B32/318C01B32/348B01J2220/4837C02F2101/308
Inventor 徐峻朱师云陈克复李军王斌高文花曾劲松
Owner SOUTH CHINA UNIV OF TECH
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