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Hemp-stem active carbon and preparation method, forming method and application thereof

A molding method and hemp stalk technology are applied to hemp stalk activated carbon and its preparation, molding method and application fields, which can solve the problems of decreased specific surface area, high usage amount and high cost, and achieve excellent adsorption performance, small volume, long length The effect of the service life

Inactive Publication Date: 2015-06-10
INFINITUS (CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The organic resin binder used in the traditional process needs to heat-treat the molded body at high temperature for a period of time, so there are disadvantages such as high energy consumption, toxicity, high cost of use, and decrease in specific surface area.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A preparation method of hemp stalk activated carbon belongs to the physical-chemical activation method, comprising the following steps:

[0038] (1) crushing the hemp stalks into powder, then washing with water to remove impurities and drying; preferably, the washed and dried hemp stalk powder is also sieved through 100 meshes;

[0039] (2) Pretreatment: soak the hemp stalk powder in an activator solution with a concentration of 0.1-5mol / L until the pore structure of the hemp stalk powder is evenly filled with the activator, then filter the hemp stalk powder, drying; the activator is any one of ammonium phosphate, diamine hydrogen phosphate, phosphoric acid, potassium hydroxide, sodium hydroxide, zinc chloride;

[0040] (3) Under nitrogen protection, heat up to 500-1000°C at a rate of 2-10°C / min, carbonize for 0.5-6 hours, and activate 0.5- After 4 hours, wash with deionized water to neutrality and then dry to obtain hemp stalk activated carbon.

[0041] Wherein, in t...

Embodiment 2

[0050] A forming method of hemp stalk activated carbon, described hemp stalk activated carbon as described in Example 1, comprising the following steps:

[0051] (1) Mix the following components in parts by weight uniformly to obtain activated carbon slurry: 100 parts of hemp stalk activated carbon crushed to 50-400 mesh, 5-45 parts of reagent A, appropriate amount of water and ethanol; wherein, reagent A is phenolic resin , carboxylated styrene-butadiene latex, styrene-acrylic latex, carboxymethyl cellulose, sodium carboxymethyl cellulose, polyvinyl alcohol and coal tar or a combination of more than one;

[0052] (2) Molding the activated carbon slurry to obtain a hemp stalk activated carbon preform, place the preform for 1 day, then move it into a constant temperature air-flow oven, heat it to 100-350°C and keep it warm for 0.5-5 hours to obtain hemp stalk Activated carbon shaped body.

[0053] The amount of water and ethanol added can be added or subtracted according to th...

Embodiment 3

[0057] After washing and drying the hemp stalk powder through a 100-mesh sieve, boil it in a 1mol / L diamine hydrogen phosphate solution for 1 hour, then filter and dry it and move it into a carbonization furnace with a nitrogen flow rate of 25ml / min. The heating rate was 5°C / min, the carbonization temperature was 500°C, and after carbonization for 0.5 hours, water vapor was passed through to activate for 2 hours, and the water vapor flow rate was 1mL / min. The activated product was washed with deionized water to neutrality and then dried to obtain hemp stalk activated carbon.

[0058] The obtained hemp stalk activated carbon has a specific surface area of ​​1100m 2 / g, the total pore volume is 0.65cm 3 / g, the pore diameter ranges from 0.7-1.8nm, and has a hierarchical microporous structure, which is composed of micropores of 0.7nm, 1.1nm and 1.8nm.

[0059] Grinding the prepared hemp stalk activated carbon to 200 meshes, then fully stirring and mixing the materials according...

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PUM

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Abstract

The invention discloses hemp-stem active carbon, of which the specific surface area is 800-3,000m<2> / g, the total pore volume is 0.5-1cm<3> / g and the pore diameter is 0.5-4nm. The hemp-stem active carbon has a layered micropore-mesopore structure. The invention further discloses a preparation method of the hemp-stem active carbon, a forming method of hemp-stem active carbon and application of formed hemp-stem active carbon in preparation of a filter element of a water purifier. The hemp-stem active carbon provided by the invention has a layered micropore-mesopore structure, a super-large specific surface area and a high pore volume and can absorb various impurities in water more easily.

Description

technical field [0001] The invention relates to the technical field of activated carbon, in particular to a hemp stalk activated carbon and its preparation, molding method and application. Background technique [0002] Activated carbon has a huge specific surface area (1000-3500m 2 / g) and developed pore structure with excellent adsorption performance, has been widely used in water removal and gas purification. As an adsorbent with excellent adsorption capacity, activated carbon has excellent chemical stability. Because it is insoluble in water or organic solvents, and resistant to acid, alkali and heat, it is widely used in food processing, environmental protection, chemical industry, pharmaceutical refining, Chemical protection and other fields. In terms of drinking water purification, activated carbon not only has the functions of decolorization and deodorization, but also can remove chlorine, heavy metal ions and organic molecules. In recent years, people are increasi...

Claims

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Application Information

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IPC IPC(8): C01B31/12
Inventor 万兴云张晨
Owner INFINITUS (CHINA) CO LTD
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