Preparation method of carbon aerogel

A carbon aerogel, carbon nanosphere technology, applied in the preparation/purification of carbon, chemical instruments and methods, other chemical processes, etc., can solve problems such as complex energy consumption, achieve wide practicability, good adsorption performance, cycle Good regeneration effect

Active Publication Date: 2019-07-23
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the recycling of carbon aerogels, carbon aerogels and oil are recovered by distillation, which is more complicated and energy-intensive than external extrusion.

Method used

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  • Preparation method of carbon aerogel
  • Preparation method of carbon aerogel
  • Preparation method of carbon aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 3.168g of glucose, add it into a polytetrafluoroethylene container, then add 40mL of deionized water, and dissolve it evenly by ultrasonication for 15min. Put the polytetrafluoroethylene container containing the solution into the reaction kettle, seal the reaction kettle, place it in an electric blast drying oven, and raise the temperature to 180°C for hydrothermal reaction for 12 hours. After the reaction, the solution was cooled to room temperature, and the precipitate was successively centrifuged and washed with absolute ethanol and deionized water, and then dried in an oven at 50°C. After drying, the product was calcined at 700° C. for 2 h under Ar atmosphere to prepare carbon nanospheres.

[0031] Add 0.2g of carbon nanospheres and 0.1g of polyvinyl alcohol (alcoholysis degree 72.5-74.5mol%, viscosity 4.2-5.0mPa·S) into 5mL deionized water, stir in a constant temperature water bath at 90°C for 60min to disperse evenly. Then add 0.02g of borax and continue to...

Embodiment 2

[0041] Ar gas was introduced into the resistance furnace at a flow rate of 200 mL / min. Raise the temperature of the resistance furnace to 950°C, adjust the flow rate of Ar gas to 700mL / min, and at the same time flow acetylene gas at a flow rate of 80mL / min for 2h. Stop heating and turn off the acetylene gas, adjust the Ar gas flow rate to 200mL / min, wait until the temperature in the furnace drops below 100°C, turn off the Ar gas, collect the product, and obtain carbon nanospheres.

[0042] Add 0.1 g of carbon nanospheres and 0.1 g of polyvinyl alcohol into 10 mL of deionized water, stir at 90 °C for 60 min, add 0.02 g of borax, and continue stirring at 90 °C for 15 min.

[0043] After the reaction, the mixed solution was transferred to a sample bottle, cooled to room temperature, and then the sample bottle was placed in a -78°C ultra-low temperature freezer for 30 minutes. Take out the sample vial, thaw it for 20 minutes, and place the sample vial in a -78°C ultra-low tempera...

Embodiment 3

[0046] Weigh 0.1g of 1,5-dihydroxynaphthalene, 0.5g of PF127, and 0.3g of ferrocene into a polytetrafluoroethylene container, then add 20mL of absolute ethanol and 1mL of 30wt% hydrogen peroxide, and mix well to obtain a mixed solution. Put the polytetrafluoroethylene container containing the mixed solution into the reaction kettle, seal the reaction kettle, place it in a heating furnace, raise the temperature to 220°C and heat for 24 hours. After the reaction, the solution was cooled to room temperature, and the precipitate was successively centrifuged and washed with absolute ethanol and deionized water, and then dried in an oven at 50° C. to prepare magnetic carbon nanospheres.

[0047] Add 0.05g of magnetic carbon nanospheres and 0.1g of polyvinyl alcohol into 7.5mL of deionized water, stir at a constant temperature of 90°C for 60min, then add 0.02g of borax, and continue stirring at 90°C for 17min.

[0048] After the reaction, the mixed solution was transferred to a sampl...

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Abstract

The invention discloses a preparation method of carbon aerogel. The carbon aerogel is prepared through a one-step method by taking carbon nanospheres as raw materials, and performing a heating reaction in a water solution system and performing freeze drying in the presence of polyvinyl alcohol serving as a crosslinking agent and borax serving as a structure-directing agent. The carbon aerogel prepared by the invention has good mechanical performance, strong adsorption capacity for oil products and organic solvent, high adsorption rate, good recycling and reproduction performance, and high practicability, and can be applied in the fields of oil-water separation, oil stain collection and the like.

Description

technical field [0001] The invention relates to a preparation method of carbon airgel, in particular to a preparation method of carbon airgel with excellent mechanical properties. Background technique [0002] Carbon airgel is a lightweight, bulky porous nanocarbon material with a continuous three-dimensional network structure. Carbon aerogels exhibit a composite hierarchical pore structure of micropores, mesopores, and macropores. This special structure makes carbon aerogels have low density, high electrical conductivity, high porosity, and high specific Properties such as surface area have attracted widespread attention in many fields such as energy and the environment. [0003] In recent years, environmental and ecological problems caused by oil pollution and toxic chemical leakage have continued to occur. In view of the unique structural advantages of carbon aerogels, they are widely used as oil adsorbents to achieve oil-water separation. However, although the existin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05B01J20/20B01J20/28B01J20/30C02F1/28
CPCC01B32/05B01J20/20B01J20/28047C02F1/283
Inventor 刘旭光崔燕康伟伟秦蕾杨永珍
Owner TAIYUAN UNIV OF TECH
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