• Title, Summary, Keyword: activated carbon fiber

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The Effect of Potassium Hydroxide on the Porosity of Phenol Resin-based Activated Carbon Fiber

  • Jin, Hang-Kyo
    • Carbon letters
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    • v.7 no.3
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    • pp.161-165
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    • 2006
  • Activated carbon fiber could be prepared at 973 K by catalytic activation using potassium hydroxide. Phenol resin fiber (Kynol) was impregnated with potassium hydroxide ethanol solution, carbonized and activated at 973 K, resulting in activated carbon fibers with different porosities. The potassium hydroxide accelerated the activation of the fiber catalytically to form narrow micropore preferentially in carbon dioxide atmosphere. The narrow micropore volume of 0.3~0.4 cc/g, total pore volume of 0.3~0.8 cc/g, mean pore width of 0.5~0.7 nm was obtained in the range of 20~50% burnoff.

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Preparation and Erosion Properties of Reaction-Bonded SiC Reinforced by Carbon Fiber (탄소섬유로 강화된 반응소결 SiC 제조 및 Erosion 특성)

  • 송진웅;임대순;김형욱
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • pp.258-264
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    • 1998
  • Three kinds of reation-bonded SiC that reaction-bonded SiC(RBSC), RBSC reinforced by carbon fiber and RBSC reinforced by activated carbon fiber were prepared for investigating the change of erosion properties. The characteristics of microstructures and the phases have been investigated by using scanning electron microscope and XRD analysis. The hardness test, toughness test and erosion test were camed out. In the cases with no carbon fiber, those kind of specimens had the highest result of hardness test and the lowest result of toughness test. With the increase of carbon fiber content, The hardness and the weight loss were decreased but the toughness was increased in the cases with carbon fiber In the cases with activated carbon fiber those specimens had the highest result of toughness test and the lowest result of hardness test with 30% contents of activated carbon fiber.

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Preparation and Erosion Properties of Reaction-Bonded SiC Reinforced by Carbon Fiber (탄소섬유로 강화된 반응소결 SiC 제조 및 Erosion 특성)

  • 송진웅;임대순;김형욱
    • Tribology and Lubricants
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    • v.15 no.1
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    • pp.59-67
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    • 1999
  • Three kinds of reation-bonded SiC that reaction-bonded SiC(RBSC), RBSC reinforced by carbon fiber and RBSC reinforced by activated carbon fiber were prepared for investigating the change of erosion properties. The characteristics of microstructures and the phases have been investigated by using scanning electron microscope and XRD analysis. The hardness test toughness test and erosion test was carried out. In the cases with no carbon fiber, those kind of specimens had the highest value of hardness and the lowest value of toughness. With the increase of carbon fiber content the hardness and the weight loss were decreased, but the toughness was increased in the cases with carbon fiber. In the cases with activated carbon fiber specimens had the highest value of toughness and the lowest value of hardness with 30% contents of activated carbon fiber.

Adsorption Characteristics of Propylamine on Acid Treated Activated Carbon Fiber (산처리된 활성탄소섬유의 Propylamine의 흡착특성)

  • 양범호;김병구;이영택;김시몽;조시형
    • Journal of the Korean Society of Tobacco Science
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    • v.25 no.2
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    • pp.111-119
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    • 2003
  • In this work, Rayon-based activated carbon fiber(KF-1500) was treated by HN $O_3$ and $H_2$S $O_4$ with different conditions. Specific surface areas(SSA, $S_{BET}$) of the treated activated carbon fibers were decreased by acidic treatment but, total surface acidities and surface functional groups were increased. In spite of the decrease of SSA, propylamin(PPA) adsorption and removal ability by activated carbon fiber(ACF) were increased by nitric acid treatment compared with the raw-ACF(KF-1500) and coconut based activated carbon. However, acidic treated activated carbon fibers were available to removal for various amines and contaminants by adsorption.n.

Silver Loading Effect for the Activated Carbon Fibers Pre-treated with Acid

  • Oh, Won-Chun;Yum, Min-Hyung
    • Bulletin of the Korean Chemical Society
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    • v.25 no.8
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    • pp.1189-1194
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    • 2004
  • The adsorption isotherms of N2 onto the metallic silver treated activated carbon fiber samples after acid treatment are Type I with a small amount of capillary condensation hysteresis. Increasing amount of acid treatment leads to a decrease in SBETs and external surface area. But, micropore volume and average pore diameter are presented in constant regular values with increasing amount of sulfuric acid treatment. SEM observes the surface morphology and crystal grown state of metal on the fiber surface. The results of EDX of Ag-activated carbon fiber pre-treated with acid show the spectra corresponding to almost all samples rich in silver with increasing the amount of acid treated. The FT-IR spectra of Ag-activated carbon fiber show that the acid pre-treatment is consequently associated with the homogeneous dispersion of metal with the increased surface acidity of the activated carbon fiber. The type and quality of oxygen groups are determined with Boehm titration method. From the those results, a positive influence of the acidic groups on the carbon fiber surface by acid treatment is also demonstrated by an increase in the contents of metallic silver with increasing of acidic groups.

The Effect of Activated Carbon Fiber on the Shelf Life of the Propellants (추진제 저장수명에 미치는 활성탄소섬유의 영향)

  • Yoon Keun-sig;Lee Jong-chan
    • Journal of Applied Reliability
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    • v.5 no.3
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    • pp.343-355
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    • 2005
  • As the propellants decompose, they release nitrogen oxides which reduce the shelf life of the propellants by accelerating decomposition rate. The activated carbon fiber was used to extend the shelf life of the propellants that was stockpiled by the military. It is found that the activated carbon fiber adsorbs the nitrogen oxides which were produced by spontaneous reaction of the propellants. As a result, the activated carbon fiber extend the shelf life of the propellants by reducing decomposition rate of the propellants. If 20g of propellant store with 2g of activated carbon fiber, the shelf life of the propellants can be lengthened by 1.4 times.

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Preparation and Characterization of Sisal Fiber-based Activated Carbon by Chemical Activation with Zinc Chloride

  • Lu, Xincheng;Jiang, Jianchun;Sun, Kang;Xie, Xinping
    • Bulletin of the Korean Chemical Society
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    • v.35 no.1
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    • pp.103-110
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    • 2014
  • Sisal fiber, an agricultural resource abundantly available in china, has been used as raw material to prepare activated carbon with high surface area and huge pore volume by chemical activation with zinc chloride. The orthogonal test was designed to investigate the influence of zinc chloride concentration, impregnation ratio, activation temperature and activation time on preparation of activated carbon. Scanning electron micrograph, Thermo-gravimetric, $N_2$-adsorption isotherm, mathematical models such as t-plot, H-K equation, D-R equation and BJH methods were used to characterize the properties of the prepared carbons and the activation mechanism was discussed. The results showed that $ZnCl_2$ changed the pyrolysis process of sisal fiber. Characteristics of activated carbon are: BET surface area was $1628m^2/g$, total pore volume was $1.316m^3/g$ and ratio of mesopore volume to total pore volume up to 94.3%. These results suggest that sisal fiber is an attractive source to prepare mesoporous high-capacity activated carbon by chemical activation with zinc chloride.

A Study on the Adsorption Characteristics of Phenol in the presence of Humic Acid Using Activated Carbon Fiber (섬유상활성탄소를 이용한 Humic Acid 공존시 페놀의 흡착특성에 관한 연구)

  • Tak, Seong-Jae;Seo, Seong-Wen;Kim, Seong-Sun;Kim, Jin-Man
    • Journal of Korean Society of Water and Wastewater
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    • v.14 no.1
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    • pp.54-61
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    • 2000
  • Recently, our circumstances are threatened by an accident that leakage of under ground storage tank and illegal dumping of synthetic organic compounds at chemical plants and many treatment methods, Activated carbon adsorption, Ozonization, Membrane filtration and Photocatalystic oxidation, are developed to remove such a synthetic organic compounds. And it has reported that Activated carbon adsorption have a great removal efficiency to nondegradable matters and organic compounds which have a high molecular weight. Comparing with other adsorbents, Activated carbon adsorption have a worse efficiency when ad desorption speed is low. Thus improved type of adsorbents was invented and one of those is Activated Carbon Filter. The purpose of this study was getting information about adsorption characteristic phenol which can be applied Activated Carbon Fiber and Granular Activated Carbon. In detail, With comparing removal characteristics of phenol in the presence Humic Acid using Activated Carbon Fiber(ACF) and Granular Activated. Carbon(GAC), it is to certify an effective application of Activated Carbon Fiber. At the range of this study, Batch test, Isotherm adsorption test and Factorial analysis, following conclusion were obtained from the results of this study. Batch test was carried to know time of adsorption equilibrium. In this study about time of adsorption equilibrium by ACF was faster than GAC's, for developed micropore of ACF. From the result of phenol adsorption test, High removal rate of adsorption is shown at pH 5. The result of lsotherm adsorption test, it has represented that the Freundlich's isotherm is most suitable one in others, that a ACF's adsorption capacity is more excellent than GAC's. Adsorption of phenol exiting humic acid is decreased getting raised humic acid concentration. Since ACF's micropore is developed at this time, an effect of high molecular humic acid is lower. Factorial analysis was carried to know about Main effect which was injection dosage of adsorbent in the range of this study.

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An Overview of the Activated Carbon Fibers for Electrochemical Applications

  • Lee Gyoung-Ja;Pyun Su-Il
    • Journal of the Korean Electrochemical Society
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    • v.9 no.1
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    • pp.10-18
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    • 2006
  • This article is concerned with the overview of the activated carbon fibers. Firstly, this review provides a comprehensive survey of the overall processes for the synthesis of the activated carbon fibers from the carbonaceous materials. Subsequently, the physicochemical properties such as pore structures and surface oxygen functional groups of the activated carbon fibers were discussed in detail. Finally, as electrochemical applications of the activated carbon fibers to electrode materials for electric double-layer capacitor (EDLC), the electrochemical characteristics of the activated carbon fiber electrodes and the various methods to improve the capacitance and rate capability were introduced. In particular, the effect of pore length distribution (PLD) on kinetics of double-layer charging/discharging was discussed based upon the experimental and theoretical results in our work. And then we discussed in detail the applications of the activated carbon fibers to adsorbent materials for purification of liquid and gas.