Preparation method of modified activated carbon fiber for adsorbing ultra-micro sulfur dioxide

A technology of activated carbon fiber and sulfur dioxide, applied in chemical instruments and methods, other chemical processes, etc., can solve problems such as energy waste, and achieve the effects of high reactive surface, improved capacity, and rich microporous structure.

Inactive Publication Date: 2012-11-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these modification methods often involve high-temperature treatment processes, resulting in a large amount of energy waste and environmental problems such as waste emissions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take 0.1 g of oxidized activated carbon fiber, 0.4 mmol of alanine, 0.08 g of NaOH and 20 g of H 2 O, respectively added to 100mL round-bottomed flask, under the condition of heating in oil bath at 100 o C stirred the reaction for 5 hours. After the reaction is finished, the activated carbon fiber product is suction-filtered and rinsed to neutrality with deionized water, and then o C oven dry for 24 hours.

[0014] The sample showed excellent ability to adsorb ultra-trace amount of sulfur dioxide in the adsorption test, for 20ppmSO 2 The adsorption capacity is up to 60mg / g. The Boehm titration method was used to measure the surface group content, and the results showed that the basic group content increased from 0.066mmol / g before modification to 1.48mmol / g.

Embodiment 2

[0016] Take 0.1 oxidized activated carbon fiber, 0.2mmol Tris, 0.08g NaOH and 20gH 2 O, respectively added to 100mL round-bottomed flask, under the condition of heating in oil bath at 100 o C stirred the reaction for 3 hours. After the reaction is finished, the activated carbon fiber product is suction-filtered and rinsed to neutrality with deionized water, and then o C oven dry for 24 hours.

[0017] The sample also showed good ultra-trace sulfur dioxide adsorption capacity, for 20ppm SO 2 The saturated adsorption capacity is about 53mg / g.

Embodiment 3

[0019] Take 0.1 g of oxidized activated carbon fiber, 0.1 mmol of arginine, 0.08 g of NaOH and 20 g of H 2 O, respectively added to 100mL round-bottomed flasks, heated at 80°C under oil bath heating conditions o C stirred the reaction for 8 hours. After the reaction was finished, the activated carbon fiber product was suction-filtered and rinsed to neutrality with deionized water, and then o C oven dry for 24 hours.

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Abstract

The invention relates to a preparation method of modified activated carbon fiber for adsorbing ultra-micro sulfur dioxide, belonging to the technical field of gas adsorption and separation. The method comprises the following steps: taking viscose-based activated carbon fiber which is oxidized by dilute nitric acid as a matrix, and taking tris hydroxyl methyl aminomethan, alanine, serine and arginine as modifiers; and successfully preparing chemically modified activated carbon fibers in which the surfaces are modified by much amidogen through a hydro-thermal reaction under certain conditions. Compared with the prior art, the preparation method has the following advantages: (1) a micromolecule modifier is used for chemically modifying the surface to keep the structural advantage of the activated carbon fibers such as high specific surface and more micro pores so that the activated carbon fibers simultaneously have abundant micro-pore structures and high activity reaction surfaces to represent relatively longer penetrating time and larger saturation adsorption capacity; (2) the modifying method is temperate in condition, small in pollution, energy-saving and environment-friendly, and easy for scaled production; and (3) the modified absorbing capacity can be increased to that 1 g of the absorbent can absorb 40-60 mg of SO2, which is improved by 4-6 times compared with the absorbing capacity of the absorbent before the modification.

Description

technical field [0001] The invention relates to a method for preparing modified activated carbon fibers for absorbing ultra-trace amounts of sulfur dioxide, which belongs to the branch of inorganic non-metallic material science and technology and is applied in the field of gas adsorption and separation. Background technique [0002] Since the advent of activated carbon fiber in the 1970s, it has been widely used in the adsorption and removal of pollutants in waste gas and wastewater, especially in the desulfurization and denitrification of flue gas, showing excellent performance. However, with the emergence of occasions that need to absorb ultra-trace amounts of sulfur dioxide, such as desulfurization and purification of polluted air for supplying clean air to proton exchange membrane fuel cells, related research is relatively blank. When the treatment object changes from flue gas containing high concentration of sulfur dioxide to air containing ultra-trace amount of sulfur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/30B01D53/02
Inventor 邱介山万鹏
Owner DALIAN UNIV OF TECH
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