High-performance carbon nano-material adsorbent and preparation and application thereof

A technology of carbon nanomaterials and adsorbents, applied in the field of nanomaterials, can solve the problems of high cost of preparation and environmental treatment, hinder commercial application, loss of specific surface area, etc., achieve reduction of drying links and material transfer links, rich channels, and preparation The effect of cost reduction

Active Publication Date: 2017-06-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation process of these materials, the carrier needs to be removed and dried, which first causes the loss of specific surface area and causes certain environmental pollution. The high cost of preparation and environmental treatment hinders its commercial application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A catalyst with magnesium oxide as a carrier is placed in a reactor, and a carbon source (methane) is passed through at 1000° C. for 0.3 hours to form a composite of single-walled carbon nanotubes and a magnesium oxide carrier. Then the heating was stopped, the carbon source was stopped, nitrogen was changed, and the temperature was lowered to room temperature.

[0026] Mix the above compound and binder (the mass ratio of the two is 8:1.5, the binder is silica sol) at 40°C for 1 hour, then add it to the molding machine, and shape it at 250°C. The magnesium oxide carrier in the molded product was removed with hydrochloric acid, filtered, washed with deionized water until neutral, and dried at 150° C. for 1 hour to obtain the final product. Wherein the mass fraction of carbon nanomaterials is 85%. The specific surface area of ​​the adsorbent is 800m 2 / g, the pore volume ratio of micropores, mesopores and macropores is 3:6:8.

[0027] Water containing 4-50PPm (mass fra...

Embodiment 2

[0029] A catalyst with magnesium carbonate and basic magnesium carbonate (mass ratio of 1:1) as a carrier is placed in a reactor, and a carbon source (ethanol and cyclohexane, each 50% by mass fraction) is passed at 800° C. for 1 hour, Magnesium carbonate and basic magnesium carbonate decompose at high temperature to generate magnesium oxide, and carbon forms a composite of single-layer graphene and magnesium oxide carrier on the surface of the carrier. Then the heating was stopped, the carbon source was stopped, nitrogen was changed, and the temperature was lowered to room temperature.

[0030] The above compound and binder (the mass ratio of the two is 20:1, the binder is aluminum sol) were mixed at 30°C for 0.5 hours, then added to the molding machine, and formed at 300°C. The magnesium oxide carrier in the molded product was removed with hydrochloric acid, filtered, washed with deionized water until neutral, and dried at 150° C. for 6 hours to obtain the final product. Wh...

Embodiment 3

[0033] A catalyst based on magnesium carbonate and calcium oxide (mass ratio: 4:1) was placed in the reactor, and a carbon source (CO, CO 2 , methanol and cyclohexanol, mass fractions were 45%, 5%, 20% and 30%) 1.2 hours, magnesium carbonate decomposed at high temperature to generate magnesium oxide, carbon deposited on the surface of the carrier to generate 1-3 layers of graphene, 1 -Composite of 3-layer carbon nanotubes and magnesium oxide, calcium oxide carrier. Then the heating was stopped, the carbon source was stopped, and the argon gas was changed, and the temperature was lowered to room temperature.

[0034] Mix the above compound and binder (the mass ratio of the two is 10:1, and the binder is PVDF) at 70°C for 1 hour, then add it to the molding machine, and shape it at 150°C. The magnesium oxide carrier in the molded product was removed with hydrochloric acid, filtered, washed with deionized water until neutral, and dried at 100°C for 12 hours to obtain the final pr...

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Abstract

The invention discloses a high-performance carbon nano-material adsorbent and preparation and application thereof. The high-performance carbon nano-material adsorbent is composed of a carbon nano-material and an adhesive. Mass fraction of the carbon nano-material is 80-97 wt%. Specific surface area of the adsorbent is 800-2200 m<2>/g. The pore volume ratio of micropore to mesopore to macropore is (1-3): (1-6): (1-10). The invention also discloses a method for directly preparing the adsorbent by the utilization of a compound of the carbon nano-material obtained during the chemical vapor deposition process and an inorganic compound carrier. The adsorbent has advantages of long service life, large handling capacity, low preparation cost, etc., and is especially suitable for adsorption of low-concentration nonpolar organic matter in a fluid.

Description

technical field [0001] The invention belongs to the field of nano-material technology, and relates to a high-performance carbon nano-material adsorbent and its preparation and application. The adsorbent is especially suitable for absorbing low-concentration non-polar organic substances in fluids. Background technique [0002] Carbon nanomaterial is a new type of material with large specific surface area, good chemical stability and non-polar surface. Its representative products include carbon nanotubes and graphene. The above characteristics make carbon nanomaterials can adsorb non-polar organic substances in gases or liquids. For example, materials such as carbon nanotubes and graphene can absorb organic matter 10-100 times their own weight, thus showing better performance than traditional activated carbon materials. In addition, in the adsorption of non-polar organic matter in water, a sponge-like structure (carbon nanotube sponge or graphene sponge) can be used to absorb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01D15/00
CPCB01D15/00B01J20/205B01J20/28064B01J20/28066
Inventor 骞伟中陈航田佳瑞多尼杨周飞尹泽芳
Owner TSINGHUA UNIV
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