• Title, Summary, Keyword: 활성탄소섬유

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Influence of the Pore Properties on Carbon Dioxide Adsorption of PAN-based Activated Carbon Nanofibers (폴리아크릴로니트릴계 활성나노탄소섬유의 기공특성이 이산화탄소 흡착에 미치는 영향)

  • Lee, Dayoung;Cho, Seho;Kim, Yesol;Lee, Young-Seak
    • Polymer Korea
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    • v.37 no.5
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    • pp.592-599
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    • 2013
  • In this study, polyacrylonitrile (PAN)-based porous carbon nanofibers were prepared from PAN polymer solution by electrospinning and KOH activation with various concentrations, and the characterization of pore structures and carbon dioxide adsorption was investigated. Manufactured PAN-based activated carbon nanofibers tend to decrease diameter and increase surface oxygen functional groups depending on the increasing concentration of KOH solution. In addition, according to the results of nitrogen adsorption for pore properties analysis, it indicated increase of the specific surface area in conformity with increasing concentration of KOH solution. Micropore volume of treated activated carbon nanofibers (ANCF) by 4 M KOH was the largest compared with other samples and mesopore volume of treated ANCF by 8 M KOH was the largest volume, respectively. The concentration of KOH effects textural and surface properties, as represented by BET and XPS, which enhance carbon dioxide adsorption capacity at 0 and $25^{\circ}C$.

Preparation of Activated Carbon Fiber-Ceramic Composites and Its Physical Properties (활성탄소섬유-세라믹복합체의 제조 및 물성)

  • 이재춘;박민진;김병균;신경숙;이덕용
    • Journal of the Korean Ceramic Society
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    • v.34 no.1
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    • pp.56-62
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    • 1997
  • The PAN (Polyacrylonitrile) based carbon fiber-ceramic composites (CFCC) were prepared from mixtures of short carbon fibers, phenolic resin and ceramic binder. The effects of carbonization temperature of a pre-cursor fiber, the stabilized PAN fiber, on the specific surface area and the bending strength of the activated CFCC were studied in this work. The precursor fiber was carbonized at 80$0^{\circ}C$ and 100$0^{\circ}C$, respectively. The CFCC were activated at 85$0^{\circ}C$ in carbon dioxide for 10~90 minutes. As the burn-off of the activated CFCC made of the precursor fiber carbonized at 80$0^{\circ}C$ was increased from 37% to 76%, the specific surface area in-creased from 493m2/g to 1090m2/g, and the bending strength decreased from 4.5MPa to 1.4MPa. These values were about two times larger than those of the activated CFCC of which precursor fiber was car-bonized at 100$0^{\circ}C$. The effects of carbonization temperature of a precursor fiber on the specific surface area and bending strength of the activated CCFC were explained by bonding force between carbon fiber and car-bonized phenolic resin as well as by relative shirnkage between carbon fiber and ceramic film.

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Micropore Analysis and Adsorption Characteristics of Activated Carbon Fibers (활성탄소섬유의 미세기공 분석 및 흡착특성)

  • Moon, Dong-Cheul;Lee, Kwang-Ho;Kim, Chang-Soo;Kim, Do-Hyung;Kim, Mi-Ran;Shin, Chae-Ho;Park, II-Young;Nam, Seoung-Youl;Lee, Chang-Gi
    • Analytical Science and Technology
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    • v.13 no.1
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    • pp.89-95
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    • 2000
  • Three grades of activated carbon fibers (ACFs) were prepared from various precursors of plantic, synthetic, and mixed fabrics of viscose rayon and cotton. The ACFs an exhibited type I isotherms on the adsorption of nitrogen or argon. Micropore analysis revealed that the ACFs have uniform micropore size distribution in which their peak diameters were in the range of $5.6{\pm}0.3{\AA}$. The BET surface area of ACFs up to $1600m^2g^{-1}$ was proportional to the adsorption capacity of iodine. The BET values of the ACFs prepared were proportional to the burn-off degree of the products.

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Regeneration Characteristics of Adsorbent Loaded with VOCs using Supercritical Carbon Dioxide (휘발성 유기용제가 흡착된 흡착제의 초임계 이산화탄소를 이용한 재생특성)

  • Lee, Seung Bum;Seong, Dae Hyung;Hong, In Kwon
    • Applied Chemistry for Engineering
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    • v.8 no.5
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    • pp.737-741
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    • 1997
  • The typical removal method of volatile organic compounds is adsorption process. In this study, granular activated carbon and activated carbon fiber were used as adsorbents, and the adsorption behavior for the two types of adsorbent was compared. And they were regenerated by supercritical carbon dioxide extraction at a constant temperature, 318.15 K, and 2000, 2500, 3000 psi respectively. The desorption percentage of initial adsorbates and iodine values were increased with pressure of supercritical carbon dioxide. The regeneration time was 70 and 60 minutes in adsorbents loaded with methyl ethyl ketone(MEK) and benzene, respectively. The desorption percentages were 64.0% for granular activated carbon and 55.3% for activated carbon fiber loaded with MEK, and 59.1% for granular activated carbon and 45.2% for activated carbon fiber loaded with benzene. The exit concentration could be evaluated by Tan and Liou model. Therefore, the granular activated carbon and the activated carbon fiber could be regenerated by supercritical fluid extraction process.

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Preparation of Electroless Copper Plated Activated Carbon Fiber Catalyst and Reactive Evaluation of NO Removal (무전해 도금법으로 제조된 구리 함유 활성탄소섬유 촉매의 제조와 NO 제거 반응성 평가)

  • Yoon, Hee-Seung;Oh, Jong Hyun;Lee, Hyung Keun;Jeon, Jong-Ki;Ryu, Seung Kon
    • Korean Chemical Engineering Research
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    • v.46 no.5
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    • pp.863-867
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    • 2008
  • Pitch based activated carbon fiber(ACF) was prepared from reformed naphtha cracking bottom oil(NCB oil) by melt spinning. The fibers obtained were stabilized, carbonized, and then steam activated. The ACF was sensitized with Pd-Sn catalytic nuclei via a single-step activation approach. This sensitized ACF was used as precursors for obtaining copper plated ACFs via electroless plating. ACFs uniformly decorated with metal particles were obtained with reduced copper plating in the reaction solution. Effects of the amount of copper on characteristics of ACF/Cu catalysts were investigated through BET surface area, X-ray diffraction, scanning emission microscopy, and ICP. The amount of copper increased with plating time, but the surface area as well as the pore volume decreased. NO conversion increased with reaction temperature. NO conversion decreased with increasing the amount of copper, which is seemed to be due to the reduction of surface area as well as the dispersion of copper.

Effect of Pore Structure of Activated Carbon Fiber on Mechanical Properties (활성탄소섬유의 기공구조가 기계적 특성에 미치는 영향)

  • Choi, Yun Jeong;Lee, Young-Seak;Im, Ji Sun
    • Applied Chemistry for Engineering
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    • v.29 no.3
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    • pp.318-324
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    • 2018
  • In this study, PAN (polyacrylonitrile) based activated carbon fibers were prepared by water vapor activation method which is a physical activation method. Activation was performed with temperature and time as parameters. When the activation temperature reached 700, 750 and $800^{\circ}C$, the activation was carried out under the condition of a water vapor flow rate of 200 ml/min. In order to analyze the pore structure of activated carbon fibers, the specific surface area ($S_{BET}$) was measured by the adsorption/desorption isotherm of nitrogen gas and AFM analysis was performed for the surface analysis. Tensile tests were also conducted to investigate the effect of the pore structure on mechanical properties of fibers. As a result, the $S_{BET}$ of fibers after the activation showed a value of $448{\sim}902m^2/g$, the tensile strength decreased 58.16~84.92% and the tensile modulus decreased to 69.81~83.89%.

Adsorption/desorption of CO2 on Activated Carbon Fibers Using Electric Swing Adsorption (활성탄소섬유상에서 전기변동법을 이용한 CO2의 흡/탈착)

  • Shim, JaeWoon;Moon, SeungHyun
    • Korean Chemical Engineering Research
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    • v.43 no.3
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    • pp.432-437
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    • 2005
  • An electric swing adsorption (ESA) process for recovering highly pure $CO_2$ from the mixed gases was tested. In this study, activated carbon fibers were used as an adsorbent. The activated carbon fibers showed fast adsorption rate and the high adsorption capacity for $CO_2$ adsorption under the condition of the ambient pressure. Activated carbon fiber with higher specific surface area was suitable to repeated adsorption-desorption cycle process, showing consistent breakthrough curve. Especially, the regeneration method by vacuum combined with ESA improved the performance of desorption process by an additional 17% regeneration efficiency compared to a vacuum only method, and showed the high regeneration efficiency at comparatively low 7-8 Wh energy.

Effects of Oxygen Functional Groups introduced onto Activated Carbon Fibers on Gas Sensing Property of Chemical Warfare Agent (활성탄소섬유에 도입된 산소작용기가 유독성 화학작용제 감응특성에 미치는 영향)

  • Kim, Su Hyun;Kim, Min-Ji;Song, Eun Ji;Lee, Young-Seak
    • Applied Chemistry for Engineering
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    • v.30 no.6
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    • pp.719-725
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    • 2019
  • In this study, activated carbon fibers were treated with oxygen plasma to investigate gas sensing properties of the dimethyl methylphosphonate (DMMP), which is a simulant gas of the chemical warfare agent, according to oxygen functional group contents. As the flow rate of oxygen plasma treatment increased, oxygen groups were introduced to the surface of activated carbon fibers from 6.90 up to 36.6%, increasing the -OH group which influences the DMMP gas sensing properties. However, as the flow rate of oxygen plasma increases, the specific surface area tends to decrease because etching on the surface of activated carbon fibers occurs due to active species generated during the oxygen plasma treatment. The resistance change rate of the DMMP gas sensor increased from 4.2 up to 25.1% as the oxygen plasma treatment flow rate increased. This is attributed to the hydrogen bonding between DMMP gas and introduced hydroxyl functional group on activated carbon fibers by the oxygen plasma treatment. Therefore, the oxygen plasma is considered to be one of the important surface treatment methods for detecting chemical warfare agents at room temperature.

Influence of Textural Structure by Heat-treatment on Electrochemical Properties of Pitch-based Activated Carbon Fiber (열처리 온도에 의한 피치계 활성탄소섬유의 기공구조 변화가 전기화학적 특성에 미치는 영향)

  • Kim, Kyung Hoon;Park, Mi-Seon;Jung, Min-Jung;Lee, Young-Seak
    • Applied Chemistry for Engineering
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    • v.26 no.5
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    • pp.598-603
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    • 2015
  • In this study, electrochemical properties of pitch-based activated carbon fibers (ACFs) were investigated by different heat-treatment temperature of the pitch-based ACFs in order to improve the specific capacitance of electric double-layer capacitor (EDLC). The ACFs were prepared by different heat-treatment temperatures of 1050 and $1450^{\circ}C$, after activation with 4 M KOH at $800^{\circ}C$ using stabilized pitch fiber. The specific surface area of prepared ACFs increased from $828m^2/g$ to $987m^2/g$, also the micropore and mesopore volumes of prepared ACFs were increased. These results because pore was produced by desorbing oxygen and hydrogen elements within the ACFs, and pore size was increased by contraction ACFs by heat-treatment process. Because of the porous properties, the specific capacitance was increased from 73 F/g to 119 F/g using cyclic voltammetry with 1 M $H_2SO_4$ at scan rates of 5 mV/s.

Preparation and Characterization of High Performance Activated Carbon Fibers from Stabilized PAN fibers (PAN계 안정화섬유로부터 고기능성 활성탄소섬유의 제조 및 특성)

  • 임연수;유기상;문숙영;정윤중;김명수;함현식
    • Journal of the Korean Ceramic Society
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    • v.40 no.5
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    • pp.468-474
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    • 2003
  • Activated carbon fibers were prepared from stabilized PAN fibers by physical and chemical activation to compare their characteristics. In this study, stabilized PAN fibers were activated by physical activation with steam and CO$_2$, and by chemical activation with KOH. The fabricated activated carbon fibers were evaluated and compared such as specific surface area, pore size distribution, pore volume, and amount of iodine adsorption. In the steam activation, a specific surface area of 1635 m$^2$/g was obtained after heat treatment at 990$^{\circ}C$. Otherwise, in the CO$_2$ activation, produced activated carbon fibers had been a specific surface area of 671 m$^2$/g after heat treatment at 990$^{\circ}C$. In chemical activation using KOH, a specific surface area of 3179 m$^2$/g was obtained with a KOH/ stabilized PAN fiber ratio of 1.5 : 1 at 900$^{\circ}C$. Nitrogen adsorption isotherms for fabricated activated carbon fibers showed type I and transformation from type I and II in the Brunauer-Deming-Deming-Teller (B.D.D.T) classification. Increasing specific surface area Increased the amount of iodine adsorption in both activation methods. Because the ionic radius of iodine was smaller than the interior micropore size of activated carbon fibers.