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Porous carbon-based nano material, and preparation method and application thereof

A nanomaterial and porous carbon technology, applied in the field of nanomaterials, can solve the problems of inability to meet application requirements, small specific surface area, limited adsorption capacity, etc., and achieve the effect of improving use efficiency, large specific surface area, and large adsorption capacity.

Pending Publication Date: 2021-08-06
杨磊 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the wide application of activated carbon in many fields, the application in new fields such as catalyst carrier, wastewater filtration and adsorption, the specific surface area of ​​conventional activated carbon is 800-1500m 2 / g, due to the small specific surface area, the adsorption capacity is limited and cannot meet the requirements of various applications

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  • Porous carbon-based nano material, and preparation method and application thereof
  • Porous carbon-based nano material, and preparation method and application thereof
  • Porous carbon-based nano material, and preparation method and application thereof

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preparation example Construction

[0039] In the first aspect, embodiments of the present invention provide a method for preparing porous carbon-based nanomaterials, such as figure 1 As shown, the method includes:

[0040] Step 1 (S11), hydrothermally carbonizing the elementary material to obtain a porous carbon-based nanomaterial precursor.

[0041] During specific implementation, add the basic element material into the dispersant, stir until the basic element material is fully dissolved, and obtain the basic element material solution; place the basic element material solution in a hydrothermal reaction kettle, and place the reaction kettle in an oven , react at 180-240° C. for 19-25 hours, cool to room temperature after the reaction is completed; centrifuge and filter the reacted product to obtain a porous carbon-based nanomaterial precursor. Wherein, the dispersant is deionized water or ultrapure water.

[0042] In this embodiment, optionally, the base material includes: waste bean dregs powder, coconut sh...

Embodiment 1

[0057] Take 50g of waste bean dreg powder and add it into 75mL of pure water, stir for more than 2h, make it fully and evenly dispersed in deionized water, and then move it into a 100mL hydrothermal reaction kettle. Then put the reaction kettle with the okara powder solution into an oven, react at 220° C. for 24 hours, then cool to room temperature, and filter the obtained product, and the obtained solid product is a porous carbon-based nanomaterial precursor.

[0058] In the next step, the resulting precursor was chemically activated with KOH. First, the precursor was immersed in a 1 Mol / L KOH solution (KOH:precursor = 3:1) and stirred continuously overnight at room temperature. The mixture was then dried in an oven at 165°C. Next, the dried and ground mixture was heat-treated in a stainless steel reactor placed in a vertical tube furnace. Set the temperature at 800° C., and heat for four hours under the protection of nitrogen, and then cool under the protection of nitrogen...

Embodiment 2

[0079] Take 50g of waste bean dregs powder and add it into 75mL of pure water, stir for 3h, make it fully and evenly dispersed in ultrapure water, and then move it into a 100mL hydrothermal reaction kettle. Then put the reactor containing the bean dregs powder solution into an oven, react at 200° C. for 20 h, then cool to room temperature, and filter the obtained product, and the obtained solid product is a porous carbon-based nanomaterial precursor.

[0080] In the next step, the resulting precursor was chemically activated with KOH. First, the precursor was immersed in a 1 Mol / L KOH solution (KOH:precursor = 3:1) and stirred continuously overnight at room temperature. Then the mixture was dried in an oven at 150°C. Next, the dried and ground mixture was heat-treated in a stainless steel reactor placed in a vertical tube furnace. Set the temperature to 700°C, and under the condition of nitrogen protection, when the temperature rises to 700°C, heat for another 3 hours, and t...

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Abstract

The invention provides a porous carbon-based nano material, and a preparation method and application thereof. The porous carbon-based nano material provided by the invention is obtained by performing pore forming on a porous carbon-based nano material precursor by taking KOH as an activating agent, and the specific surface area of the obtained porous carbon-based nano material exceeds 2000 m<2> / g and is far larger than that of the existing porous carbon-based material. The porous carbon-based nano material has the advantages of large specific surface area, good chemical stability, large adsorption capacity and the like, and can more effectively adsorb organic pollutants such as pigments, COD, soluble phenols and vinyl chloride, inorganic pollutants such as nitrate and arsenic oxide, and pollutants such as heavy metal ions in wastewater, so the porous carbon-based nano material improves the use efficiency of activated carbon in unit volume as much as possible.

Description

technical field [0001] The invention relates to the field of nanomaterials, and mainly relates to a porous carbon-based nanomaterial and its preparation method and application. Background technique [0002] As a porous carbon material, activated carbon has the characteristics of developed pore structure and large specific surface area. Because it is an excellent adsorbent, it is widely used in environmental protection, chemical industry, food industry, hydrometallurgy, pharmaceutical refining, and military chemical protection. and other fields. The adsorption effect of activated carbon on pollutants mainly depends on the size of its specific surface area and the richness of pore structure, and also has a certain relationship with the adsorption properties of surface functional groups. According to the current research results, when the pore size of activated carbon is 2 to 4 times that of the adsorbed substances, it can more effectively adsorb pollutants. With the wide app...

Claims

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Application Information

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IPC IPC(8): C01B32/348B01J20/20B82Y40/00
CPCC01B32/348B01J20/205B82Y40/00
Inventor 杨磊钟丹
Owner 杨磊
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