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Preparation method for silicon-dioxide-based carbon fiber composite adsorbent

A technology based on carbon fiber and composite adsorption, applied in chemical instruments and methods, separation methods, other chemical processes, etc., can solve problems that have not been seen yet, achieve superior adsorption characteristics, reduce drying shrinkage, and easy adsorption

Inactive Publication Date: 2016-07-20
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no preparation method of silica-based carbon fiber composite adsorbent with tetraethyl orthosilicate as silicon source and nano-activated carbon fiber as dopant

Method used

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  • Preparation method for silicon-dioxide-based carbon fiber composite adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Preparation of sol mixture: first, a certain proportion of ethyl orthosilicate (2mol), twice distilled water, absolute ethanol, N,N-dimethylformamide and ammonia water were mixed at normal temperature and pressure (wherein TEOS, h 2 O, EtOH, DMF, and NH 4 ·H 2 O molar ratio is 1: 10: 2.2: 1: 0.00037), vigorously stirred for 10h, then added an appropriate amount of nano-activated carbon fiber, so that the mass percentage of nano-activated carbon fiber accounted for the sol was 0.5wt%, and stirred for 2min, and then ultrasonically oscillated for 5min , to obtain a sol mixture.

[0018] (2) Solvent replacement and hydrophobic modification: put the sol mixture in a drying oven, and raise the temperature to 50°C by using a very slow heating method (the heating rate is 1°C / h) to obtain a gel mixture, and then put the gel mixture Put it into anhydrous ethanol / n-hexane solution (molar ratio 1:1) for aging and solvent replacement for 48h, then put it into trimethylchloros...

Embodiment 2

[0021] (1) Preparation of sol mixture: first, a certain proportion of ethyl orthosilicate (2mol), twice distilled water, absolute ethanol, N,N-dimethylformamide and ammonia water were mixed at normal temperature and pressure (wherein TEOS, h 2 O, EtOH, DMF, and NH 4 ·H 2 O molar ratio is 1: 10: 2.2: 1: 0.00037), vigorously stirred for 10h, then added an appropriate amount of nano-activated carbon fibers, so that the mass percentage of nano-activated carbon fibers in the sol was 1.5wt%, and stirred for 2min, then ultrasonically oscillated for 5min , to obtain a sol mixture.

[0022] (2) Solvent replacement and hydrophobic modification: put the sol mixture in a drying oven, and raise the temperature to 50°C by using a very slow heating method (the heating rate is 1°C / h) to obtain a gel mixture, and then put the gel mixture Put it into anhydrous ethanol / n-hexane solution (molar ratio 1:1) for aging and solvent replacement for 48h, then put it into trimethylchlorosilane / hexadec...

Embodiment 3

[0025] (1) Preparation of sol: firstly mix a certain proportion of tetraethyl orthosilicate (2mol), twice distilled water, absolute ethanol, N,N-dimethylformamide and ammonia water under normal temperature and pressure (wherein TEOS, H 2 O, EtOH, DMF, and NH 4 ·H 2 O molar ratio is 1: 10: 2.2: 1: 0.00037), vigorously stirred for 10 h, and then ultrasonically oscillated for 5 min to obtain a sol.

[0026] (2) Solvent replacement and hydrophobic modification: put the sol in a drying oven, and raise the temperature to 50°C by using a very slow heating method (the heating rate is 1°C / h) to obtain a gel, and then put the gel into a dry oven. Aging and solvent replacement were carried out in water ethanol / n-hexane solution (molar ratio 1:1) for 48h, and then put into trimethylchlorosilane / hexadecyltrimethylammonium bromide / n-hexane mixed solution (TMCS, The molar ratio of CTBA and n-hexane was 1:0.0008:1) for hydrophobic modification, and then the gel after hydrophobic modificatio...

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Abstract

The invention particularly relates to a preparation method for a silicon-dioxide-based carbon fiber composite adsorbent. Firstly, tetraethyl orthosilicate (TEOS), redistilled water, absolute ethyl alcohol, N,N-dimethylformamide and ammonia water are mixed to prepare sol, then nanometer active carbon fiber is added, an extremely slow heating mode is adopted to heat a mixture to a certain temperature, a gel mixture is obtained and then subjected to aging, solvent exchange and hydrophobic modification, gel is cleaned by n-hexane, drying treatment is performed finally, and the silicon-dioxide-based carbon fiber composite adsorbent is obtained.

Description

technical field [0001] The invention belongs to the field of organic waste gas pollution control, and in particular relates to a preparation method of a silica-based carbon fiber composite adsorbent. Background technique [0002] Benzene, toluene, and xylene (commonly known as "industrial triphenyl") are widely used as chemical raw materials or organic solvents in petrochemical, pharmaceutical, leather, dye and other industries. Burning, poisonous. Among the methods of recycling triphenyl waste gas, the development of adsorption method is relatively mature, and the performance of the adsorbent is the key factor affecting the adsorption effect. [0003] Nano-activated carbon fibers have a fast absorption and desorption rate, which is conducive to adsorption and separation, while silica airgel has good thermal stability and is easy to desorb. Used in recycling. The invention fully utilizes the characteristics of the nano activated carbon fiber and the silicon dioxide airgel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/02
CPCB01J20/20B01D53/02B01D2253/102B01D2253/106B01D2257/7027B01J20/103B01J2220/42B01J2220/4806B01J2220/4812
Inventor 黄维秋谭小兵吕爱华张炳权王翊红徐先阳曹芮周旭红许继星
Owner CHANGZHOU UNIV
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