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CN-121988301-A - Modification method of activated carbon fiber, modified activated carbon fiber and application of modified activated carbon fiber

CN121988301ACN 121988301 ACN121988301 ACN 121988301ACN-121988301-A

Abstract

The invention belongs to the technical field of carbon fiber material modification, and relates to a modification method of activated carbon fiber, a modified activated carbon fiber and application thereof. The method comprises the specific steps of (1) mixing the activated carbon fiber with maleic acid solution and ammonium formate solution, wherein the mass fraction ratio is (0.1-1): (2-10): (2-10), reacting at 50-70 ℃, and (2) taking out the reaction product after the reaction is finished, cleaning and drying to obtain the modified activated carbon fiber. The result shows that under the compound modification condition of 6% ammonium formate and 4% maleic acid, the adsorption capacity of the activated carbon fiber material to SO 2 after compound modification reaches 18.294mg/g, and the adsorption capacity is improved by 141.36% compared with an unmodified original sheet.

Inventors

  • DONG RUITING
  • LUO TAOPENG

Assignees

  • 南昌师范学院

Dates

Publication Date
20260508
Application Date
20260119

Claims (10)

  1. 1. The modification method of the activated carbon fiber is characterized by comprising the following specific steps: (1) Mixing the activated carbon fiber with maleic acid solution and ammonium formate solution, wherein the mass fraction ratio is (0.1-1) (2-10), and reacting at 50-70 ℃; (2) And after the reaction is finished, taking out a reaction product, and cleaning and drying to obtain the modified activated carbon fiber.
  2. 2. The method of claim 1, wherein the maleic acid concentration in the mixed solution is 4wt%.
  3. 3. The method of claim 1, wherein the ammonium formate concentration in the mixed solution is 6wt%.
  4. 4. The method for modifying according to claim 1, wherein the mixing is followed by ultrasonic treatment to remove excess air bubbles from the activated carbon fibers.
  5. 5. The method of claim 1, wherein the reaction is carried out by heating in a water bath.
  6. 6. The modification process according to claim 1, wherein the reaction time is 5 to 7 hours.
  7. 7. The method of claim 1, wherein the washing is performed by ultrasonic washing with deionized water and/or the drying is performed by vacuum drying.
  8. 8. The method according to claim 7, wherein the washing condition comprises 15min of water exchange and 30min of ultrasonic treatment, and/or the drying condition comprises 50-70 ℃ of drying for 5-7h.
  9. 9. A modified activated carbon fiber produced by the modification process of any one of claims 1 to 8.
  10. 10. Use of a modified activated carbon fiber according to claim 9 for the preparation of a pollutant gas adsorbent, in particular a SO 2 adsorbent.

Description

Modification method of activated carbon fiber, modified activated carbon fiber and application of modified activated carbon fiber Technical Field The invention relates to the technical field of material modification, in particular to a modification method of activated carbon fiber, a modified activated carbon fiber and application thereof. Background Both coal and petroleum contain elemental sulfur, which is produced when burned. SO 2 is extremely harmful to the eyes and respiratory mucosa of humans and animals, and therefore, in industrial production such as plant tail gas absorbing devices, there is a need for better adsorptive filter materials to help plants reduce the emission of contaminant gases. Or in the daily life such as air purifier, etc., also need better adsorption filter core material to reduce the content of pollutant gas in indoor environment, in order to improve people's quality of life. The activated carbon fiber has the advantages of uniform and fine micropore structure, large micropore capacity, good adsorption effect, high purification efficiency, reusability, no secondary pollution and the like, so that the activated carbon fiber has wide research and application in various environmental treatments such as tail gas treatment and the like. Through the modification technology, the physical property and chemical property of the ACF can be effectively changed, such as increasing the roughness of the surface of the ACF, increasing the adsorption contact surface area of ACF fibers, and further improving the adsorption performance of the ACF on pollutant gases such as SO 2. The adsorption properties of ACF are mainly dependent on the nature of its fiber surface and internal pore structure, as well as the functional groups of the surface. The nature and distribution of these surface functional groups plays an important role in adsorption activity and selectivity. The main modification mode of the carbon material discussed in the literature Li Wanjun, huang Bangfu, yang Zhengyu, etc. and the research and hope of the desulfurization and denitrification performance of the activated carbon [ J ] silicate report, 2022,41 (4): 1318-1327., is that the carbon material is modified at high temperature of more than 750 ℃ under N 2 atmosphere, or the surface of the carbon material is etched and chemically reacted by strong acid and alkali reagents such as HNO 3、H2SO4, naOH, etc. so as to improve the specific surface area of the carbon material, increase the oxygen-containing functional group and the nitrogen-containing functional group of the material, and finally improve the desulfurization performance of the material. However, the method has the problems of high energy consumption, high cost, high harm of strong acid and strong alkali reagents, difficult treatment of waste liquid and the like, and influences the final market application prospect of the material. Therefore, there is a need for a mild and simple way to modify carbon materials with a mild and simple reaction temperature and modifying agent, to increase the specific surface area of the materials, oxygen-containing functional groups and nitrogen-containing functional groups, to increase the desulfurization performance of the materials, and to provide effective support for the application of carbon material desulfurization technology. Disclosure of Invention In order to solve the problems, the invention provides a modification method of an activated carbon fiber, the modified activated carbon fiber and application thereof. The result shows that under the compound modification condition of 6% ammonium formate and 4% maleic acid, the adsorption capacity of the activated carbon fiber material to SO 2 after compound modification reaches 18.294mg/g, and the adsorption capacity is improved by 141.36% compared with an unmodified original sheet. In the invention, ACF (activated carbon fiber) is soaked in maleic acid or ammonium formate with different concentrations for reaction through earlier research, whether the reaction of the two single modifying reagents can improve the adsorption performance of the activated carbon fiber or not is researched, and the optimal modifying concentration is researched. The results show that both maleic acid modification and ammonium formate modification can significantly improve the adsorption performance of ACF-SO 2. Wherein, the 4% maleic acid has the best modifying effect, the adsorption capacity of the modified ACF-SO 2 reaches 17.410mg/g, and the adsorption rate is improved by 129.69%. After mixing ammonium formate with different proportions on the basis of 4% maleic acid for composite modification, the composite modification is found to further improve the adsorption performance of the material. Through the one-step reaction, the surface of the carbon fiber material is obviously etched, so that the specific surface area of the material is increased, and the active sites are increased. And the oxygen-containing