Preparation method of damp-proof, breathable and super-hydrophobic activated carbon

An activated carbon and super-hydrophobic technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve problems such as the ability to adsorb non-polar organic substances, achieve excellent moisture-proof properties, and improve durability The performance and pore structure have little influence on the effect

Inactive Publication Date: 2017-11-07
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When activated carbon is used for exhaust gas recovery, due to the capillary phenomenon of the hydrophilic groups on the surface of activated carbon, a large amount of water in the environment is adsorbed on the surface of the activated carbon, which greatly reduces the ability to adsorb non-polar organic substances during use.

Method used

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  • Preparation method of damp-proof, breathable and super-hydrophobic activated carbon
  • Preparation method of damp-proof, breathable and super-hydrophobic activated carbon
  • Preparation method of damp-proof, breathable and super-hydrophobic activated carbon

Examples

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Effect test

Embodiment 1

[0017] (1) Pre-treatment: put the activated carbon sample in an oven at 120°C, dry for 24 hours, fully remove moisture, and set aside;

[0018] (2) Surface modification: add the dried activated carbon and octadecyltriethoxysilane into the vacuum drying oven at the same time according to the mass ratio of 250:1, vacuumize, adjust the temperature to 120°C, and keep the time for 24h.

[0019] (3) Drying and curing: the modified activated carbon was placed in an oven at a temperature of 150°C and kept for 0.5h to complete the preparation. After modified by this method, the surface of activated carbon still maintains its porous structure ( figure 1 ), while the static contact angle of water droplets on the surface of the sample can reach 150.4±0.8° ( figure 2 ).

Embodiment 2

[0021] (1) Pre-treatment: Put the activated carbon sample in an oven at 80°C, dry for 24 hours, fully remove moisture, and set aside;

[0022] (2) Surface modification: add the dried activated carbon and heptadecylfluorodecyltrimethoxysilane into a vacuum drying oven at the same time at a mass ratio of 500:1, vacuumize, adjust the temperature to 180°C, and hold for 12 hours.

[0023] (3) Drying and curing: the modified activated carbon was placed in an oven at a temperature of 80°C and kept for 0.5h to complete the preparation. After the modified method, the static contact angle of water droplets on the surface of the sample can reach 149.1±1° ( Figure 4 ).

Embodiment 3

[0025] (1) Pre-treatment: put the activated carbon sample in an oven at 120°C, dry for 6 hours, fully remove moisture, and set aside;

[0026] (2) Surface modification: soak the dried activated carbon into 1wt.% ethanol solution of nonafluorohexylchlorosilane, and place the solution in an oven at 60°C for 2 hours;

[0027] (3) Drying and curing: the modified activated carbon was placed in an oven at a temperature of 120°C and kept for 1 hour to complete the preparation. After modified by this method, the surface of activated carbon still maintains its porous structure, and the static contact angle of water droplets on the surface of the sample can reach 144.1±0.4° ( image 3 ).

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Abstract

A preparation method of damp-proof, breathable and super-hydrophobic activated carbon comprises the steps as follows: an activated carbon sample is placed in a drying oven to be dried for 6-24 h for later use after moisture is fully removed; the pretreated activated carbon and a low-surface-energy substance are added to a vacuum drying oven in the mass ratio being (100-500):1, vacuum pumping is performed, the temperature is adjusted to 60-180 DEG C, and the mixture is kept for 2-24 h; or the pretreated activated carbon is soaked in a solution containing the low-surface-energy substance, the solution is placed in a drying oven at 60-120 DEG C and kept for 2-10 h; the activated carbon subjected to surface modification is taken out, placed in a drying oven at 80-150 DEG C and kept for 0.5-4 h, and the damp-proof, breathable and super-hydrophobic activated carbon can be obtained. The method is simple in process, easy to operate, low in equipment requirement, low in cost and suitable for mass preparation, and a new idea is provided for improving the damp-proof capacity, improving the adsorption performance and prolonging the service life of the activated carbon.

Description

technical field [0001] The invention belongs to the technical field of activated carbon preparation, and in particular relates to a preparation method of moisture-proof and breathable super-hydrophobic activated carbon. Background technique [0002] Activated carbon is a porous carbon material with rich pore structure and large specific surface area, and is widely used in many fields such as adsorption, separation, catalysis and electronics. Especially in hydrogen storage, double-layer electrodes, environmental protection water treatment and gas treatment. Many factors can affect the adsorption performance of activated carbon, especially activated carbon structure (basic microcrystalline structure, pore structure and chemical structure), adsorbate chemical properties and environmental conditions. For example, as an adsorption medium in the nuclear industry, activated carbon can effectively recover low-concentration radon, krypton radioactive elements and their progeny, bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30
CPCB01J20/20B01J20/28054
Inventor 张友法张文文余新泉
Owner SOUTHEAST UNIV
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