Active carbon prepared from waste plant-based biomass, and preparation method thereof

A technology for preparing activated carbon and waste plants, which is applied in the field of biomass waste recycling and activated carbon preparation, can solve the problems of difficult control of pore structure and surface functional groups, poor adsorption performance, complex and inefficient, etc., and achieves low cost of raw materials and improved efficiency. rate, the effect of reducing the dosage

Inactive Publication Date: 2016-08-03
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing activated carbon by using waste plant-based biomass, aiming to solve the problems of complex and inefficien...

Method used

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Examples

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Effect test

preparation example Construction

[0025] The preparation method of utilizing waste plant-based biomass to prepare activated carbon according to the embodiment of the present invention comprises the following steps:

[0026] 100 parts of plant-based biomass is pulverized, mixed with 0-200 parts of chemical activator, 1-200 parts of any one or more nitrogen-containing phosphates, and impregnated evenly, and activated by heating to charcoal;

[0027] Or evenly mix 100 parts of plant-based biomass with any one or more of 1-200 parts of nitrogen-containing phosphates, and then impregnate with 0-200 parts of chemical activator after carbonization, and activate by heating;

[0028] Or mix 100 parts of plant-based biomass with 1-200 parts of any one or more kinds of nitrogen-containing phosphates uniformly, form charcoal, and then undergo physical activation during the heating process to obtain activated carbon.

[0029] The waste plant-based biomass includes, but is not limited to, wood chips, bamboo chips, straw, co...

Embodiment 1

[0037] The raw material used in this example is wood chips (100 mesh). After drying, 100 parts of wood chips and 50 parts of melamine polyphosphate are uniformly mixed, and then impregnated with 50 parts of KOH for 24 hours. After drying, the sample is placed in a tube furnace. N 2 Under protection, the heating rate is 10°C / min, and the temperature is raised to 600°C at a constant speed, staying for 30 minutes, and activated to form carbon. The obtained sample is washed with water until the pH value of the filtrate is 7.0-8.0, and then dried in a 105°C drying oven to constant weight. , to obtain activated carbon with amine functional groups. After testing, the yield of activated carbon reached 30%, the iodine adsorption value reached 1396.2mg / g, the methylene blue adsorption amount reached 572.3mg / g, and the specific surface area was 1518m 2 / g.

Embodiment 2

[0039] The raw material that this embodiment selects is bamboo powder (100 order), and 50 parts of phosphoric acid impregnate 24h, after drying, 100 parts of bamboo powder and 15 parts of melamine phosphates are uniformly mixed, then sample is placed in tube furnace under nitrogen protection Stay at 500°C for 1 hour to activate into carbon, wash the obtained sample with water until the pH of the filtrate is about 7.0, and then place it in a drying oven at 105°C to dry to constant weight to obtain activated carbon with amine functional groups. After testing, the yield of activated carbon reached 45%, the iodine adsorption value reached 977mg / g, the methylene blue adsorption amount reached 192mg / g, and the specific surface area was 1198m 2 / g.

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Abstract

The invention discloses an active carbon prepared from waste plant-based biomass, and a preparation method thereof. The method comprises the following steps: crushing 100 parts of plant-based biomass, uniformly mixing and dipping the crushed plant-based biomass, 0-200 parts of a chemical activator and 1-200 parts of one or more of nitrogen-containing phosphates, and carrying out heating carbon-forming activation to obtain the active carbon; or crushing 100 parts of plant-based biomass, uniformly mixing the crushed plant-based biomass with one or more of 1-200 parts of nitrogen-containing phosphates, forming carbon, mixing and dipping the obtained carbon and 0-200 parts of the chemical activator, and heating and activating to obtain the active carbon; or crushing 100 parts of plant-based biomass, uniformly mixing the crushed plant-based biomass with one or more of 1-200 parts of nitrogen-containing phosphates, forming carbon, and physically activating the obtained carbon in the heating process to obtain the active carbon, wherein the above heating mode comprise temperature programmed mode, uniform heating re or rapid heating, and the stay time is 30min ~ 4h. The method has the advantages of low raw material cost, simple operation and high active carbon yield, and the active carbon has a nitrogen-containing functional group and an excellent adsorption performance.

Description

technical field [0001] The invention belongs to the technical field of biomass waste recycling and preparation of activated carbon, and in particular relates to a method for preparing activated carbon by utilizing waste plant-based biomass. Background technique [0002] Plant-based biomass is the most abundant and productive material on the earth. According to statistics, the global plant-based biomass material is regenerated at a rate of more than 150 billion tons per year. Apart from ingestion by humans and other plants and animals, plant-based natural biomass is largely discarded. Waste plant-based biomass includes waste from crops, forest products, marine products (such as various seaweeds) and municipal waste (such as paper, natural fibers), etc. At present, waste biomass accounts for 62.1% of my country's annual solid waste production. However, most of the waste plant-based biomass, such as straw, corn cob, etc., is mainly disposed of through incineration or landfill...

Claims

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Application Information

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IPC IPC(8): C01B31/12C01B31/10C01B32/336
Inventor 江霞白时兵蒋文举刘洪英李稀
Owner SICHUAN UNIV
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