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Modified biochar-based adsorbent with core-shell structure and preparation method thereof

A core-shell structure, biochar technology, applied in biofuels, chemical instruments and methods, other chemical processes, etc., to achieve the effects of easy transportation, significant adsorption performance, and improved compressive strength

Active Publication Date: 2020-12-08
FUZHOU INSTITUE OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of biochar with core-shell structure can not only eliminate the dust pollution problem caused by powder biochar, but also reduce the loss and pollution caused by collision, extrusion and crushing during transportation, and increase the pollution to a certain extent. The specific surface area per unit volume further improves the adsorption performance of biochar for heavy metals

Method used

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  • Modified biochar-based adsorbent with core-shell structure and preparation method thereof
  • Modified biochar-based adsorbent with core-shell structure and preparation method thereof
  • Modified biochar-based adsorbent with core-shell structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] a. Take the stems and leaves of sun-dried water hyacinth and crack them for 210s under the working condition of microwave cracking furnace power of 1100w to obtain the required powder biochar. 200g powder biochar, 200g phenolic resin, 150g ammonium bicarbonate, 6g alkyl dimethyl Base betaine, 20g calcium carbonate, 30g gelatin, 10g silane coupling agent KH550 are evenly mixed, then add 20 drops of alcohol and stir, after fully stirring, put the mixture into an extrusion granulator and apply 0.5MPa pressure to extrude Granulate and shape, then take out the shaped granular biochar, and place it in a microwave cracking furnace with a power of 700w for activation treatment for 150s. The nuclei of shaped activated carbon are prepared and set aside.

[0046] b. Add 25g of metal aluminum powder, 100g of PP, 5g of white oil, 1g of glass fiber, and 0.5g of polyethylene wax into a high-speed mixer and mix evenly, keeping it in a hot state (40-50 degrees Celsius) to obtain a gel m...

Embodiment 2

[0052]a. Take the stems and leaves of sun-dried water hyacinth and crack them for 210s under the working condition of microwave cracking furnace power of 1100w to obtain the required powder biochar. 200g powder biochar, 180g phenolic resin, 150g ammonium bicarbonate, 6g alkyl dimethyl Base betaine, 20g calcium carbonate, 30g gelatin, 10g silane coupling agent KH550 are evenly mixed, then add 20 drops of alcohol and stir, after fully stirring, put the mixture into an extrusion granulator and apply 0.5MPa pressure to extrude Granulate and shape, then take out the shaped granular biochar, and place it in a microwave cracking furnace with a power of 700w for activation treatment for 150s. The nuclei of shaped activated carbon are prepared and set aside.

[0053] b. Add 20g of metal aluminum powder, 100g of PP, 5g of white oil, 1g of glass fiber, and 0.5g of polyethylene wax into a high-speed mixer and mix evenly, keeping it in a hot state (40-50 degrees Celsius) to obtain a gel ma...

Embodiment 3

[0059] a. Take the stems and leaves of sun-dried water hyacinth and crack them for 210s under the working condition of microwave cracking furnace power of 1100w to obtain the required powder biochar. Base betaine, 20g calcium carbonate, 30g gelatin, 10g silane coupling agent KH550 are evenly mixed, then add 20 drops of alcohol and stir, after fully stirring, put the mixture into an extrusion granulator and apply 0.5MPa pressure to extrude Granulate and shape, then take out the shaped granular biochar, and place it in a microwave cracking furnace with a power of 700w for activation treatment for 150s. The nuclei of shaped activated carbon are prepared and set aside.

[0060] b. Add 20g of metal aluminum powder, 100g of PP, 5g of white oil, 1g of glass fiber, and 0.5g of polyethylene wax into a high-speed mixer and mix evenly, keeping it in a hot state (40-50 degrees Celsius) to obtain a gel material;

[0061] c. Put the core body into the gel material and stir (5min); take out...

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Abstract

The invention discloses biochar with a porous core-shell structure and a preparation method thereof. The biochar is of a porous core-shell structure with a core body and a shell. The preparation method comprises the following steps: carrying out microwave thermal cracking on stems and leaves of water hyacinth to obtain powdered biochar, adding a pore-forming agent and a binder, uniformly mixing, carrying out extrusion granulation on the mixture by using a granulator, carbonizing to obtain granular biochar, coating the periphery of the granular biochar with a layer of protective shell, and carrying out acid washing or solution washing to obtain the porous core-shell structure. And finally, preparing the granular biochar with the core-shell structure having the core body and the shell. The biochar with the core-shell structure not only can eliminate the problem of dust pollution caused by powdered biochar, but also can reduce the problems of loss, pollution and the like caused by crushing due to collision and extrusion in the transportation process, the specific surface area per unit volume can be increased to a certain extent, and the heavy metal adsorption performance of the biochar is further improved.

Description

technical field [0001] The invention belongs to the technical field of biochar materials, and in particular relates to a modified biochar-based adsorbent with a core-shell structure and a preparation method thereof. Background technique [0002] Due to its strong adsorption capacity, stable chemical properties, large specific surface area, and heat, acid, and alkali resistance, biochar has been used as early as a hundred years ago. In 1785, Lowitz demonstrated that charcoal could decolorize certain liquids; ten years later, charcoal had its first industrial application in English sugar refineries. With the rise of the "industrial revolution" in the later stage, the application range of biochar has become wider and wider, from the initial simple application of decolorization and adsorption to food processing, chemical industry, military chemical protection and other aspects. In the early stage, most of the powdered biochar was used in water purification and air purification,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30
CPCB01J20/20B01J20/28021Y02E50/10
Inventor 苏建彬沈元兴陈家城林梅彬邱晨曦林少芳林腾飞
Owner FUZHOU INSTITUE OF TECH
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