• Title, Summary, Keyword: 활성탄소섬유

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Studies on Molecular Sieve Characteristics of Activated Carbon Fibers for Selective Gas Separation (선택적 가스분리를 위한 활성탄소섬유의 분자체 특성 연구)

  • 박병배;김도수;박영성
    • Journal of the Korean Ceramic Society
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    • v.38 no.1
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    • pp.1-8
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    • 2001
  • 선택적 가스분리를 위한 분자체탄소(Molecular Sieve Carbon: MSC)로서의 활용을 위해 제조된 활성탄소섬유의 흡착능과 분자체 특성이 다양한 분자크기를 갖는 가스 흡착실험을 통해 조사되었다. 각 활성화 조건별 세공크기분포와 세공발달 전개과정을 유추함으로서, 세공크기분포의 조절이 가능하게 되었으며 활성탄소섬유의 분자체 탄소로서 활용을 용이하게 할 수 있었다. 800, 85$0^{\circ}C$의 온도로 수증기에 의해 활성화한 활성탄소섬유의 경우 burn-off가 각각 50, 40% 정도를 가진 활성탄소섬유가 비교적 작은 분자크기(0.3~0.4nm)의 흡착질에 대한 분자체 특성을 나타냈다. 또한, 다양한 분자크기의 흡착질을 포함하는 혼합가스의 유속과 흡착온도의 조절로서 원하는 흡착질의 선택적 분리를 위해 활성탄소섬유가 갖는 분자체 특성 향상을 보였다.

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Preparation of Gas Sensor from Pitch-based Activated Carbon Fibers and Its Toxic Gas Sensing Characteristics (피치계 활성탄소섬유기반 가스센서 제조 및 유해가스 감응 특성)

  • Kim, Min Il;Lee, Young-Seak
    • Applied Chemistry for Engineering
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    • v.25 no.2
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    • pp.193-197
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    • 2014
  • The electrode for gas sensor was prepared by using pitch-based activated carbon fibers and polyvinyl alcohol (PVA) to investigate the toxic gas sensing characteristics. The physicochemical properties of activated carbon fibers electrode for gas sensor were analyzed with SEM and BET. Toxic gases sensing property of the electrode was also identified by different toxic gases such as $NH_3$, NO and $CO_2$. The specific surface area of activated carbon fibers electrode for gas sensor was decreased by 33% owing to PVA used as a binder compared with the activated carbon fibers. However, its pore size distribution of the ACF electrode was not greatly influenced by PVA. The activated carbon fibers electrode for gas sensor responded to toxic gases by electron hopping unlike semiconductor based gas sensors. In this study, activated carbon fibers electrode was decreased to 7.5% in resistance for the NH3 gas of the 100 ppm concentration and its $NH_3$ gas sensing property was confirmed the most excellent compared with other toxic gases.

Adsorption and desoption property of activated carbon fiber coated with transition metal (전이금속 코팅 활성탄소섬유의 흡착 및 탈착특성)

  • You, Seung-Han;Kim, Jung-Su;Jang, Hyun-Tae;Cha, Wang-Seog
    • Proceedings of the KAIS Fall Conference
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    • pp.286-288
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    • 2011
  • 활성탄소섬유의 유해 미생물의 번식 억제력을 조사하기 위해 한천베지배양법을 이용하였다. 전이금속으로 코팅된 활성탄소섬유는 일부 유해 미생물에서 번식억제력이 나타났으며, 유해 미생물은 인간의 피부 부종을 야기시키는 미생물인 candida albicans이었다. 그리고 코팅 활성탄소섬유의 흡 탈착력은 코팅되지 않은 활성탄소섬유보다 약 5% 내외로 감소함을 알 수 있었다.

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Propellant Shelf-life Extension by Surface-modified Activated Carbon Fiber (활성탄소섬유를 이용한 추진제 저장수명 연장)

  • Yoon, Keun Sig;Lee, Young Seak;Ryu, Seung Kon
    • Korean Chemical Engineering Research
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    • v.49 no.4
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    • pp.443-448
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    • 2011
  • The propellant has a short shelf-life because of nitrogen oxides that were released from nitrocellulose decomposition. As-received and surface-modified ACFs were applied to remove the nitrogen oxides with intend to extend the shelf-life of propellant. The specific surface area of modified ACFs was slightly decreased but nitrogen function groups such as pyridine, pyridone and pyrrol were created on the surface of ACFs. As a result, the NO removal capacity of the surface-modified ACF by propellant waste increased about twice than that of the as-received ACF. The shelf-life of propellant was extended about 1.25 times by accompanying surface-modified ACF.

Preparation of Electrospun PI-based ACF Web for Electrode of Electric Double Layer Capacitior(EDLC) (정전기 방사에 의한 EDLC 전극용 폴리이미드계 활성탄소섬유 웹의 제조)

  • Choi, Young-Ok;Kim, Chan;Yang, Gab-Seung
    • Proceedings of the Korean Fiber Society Conference
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    • pp.134-137
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    • 2003
  • 탄소섬유나 활성탄소섬유(activated carbon fiber, ACF)는 일반적으로 출발물질에 따라 polyacrylonitrile(PAN)계, 아크릴(acryl)계, 피치(pitch)계, 페놀(phenol)계 등으로 분류할 수 있다. 보통 습식, 용융 혹은 용융분사(melt-blown) 방사 방법에 의해 섬유 형태로 형성한 다음 산화성 가스 분위기에서 불융화 과정을 거쳐 열에 대한 안정성을 부여하여 불활성 분위기에서 탄소화하여 탄소섬유를 제조하거나, 수증기나 이산화 탄소와 같은 산화성 분위기에서 활성화하여 활성탄소섬유를 제조한다. (중략)

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Development of Metal Loaded Activated Carbon Fiber for Eliminating Targeted VOCs Originated from Solvent(II) (특정용제 Target 형 활성금속첨착 활성탄소섬유의 개발(II))

  • Choi, Kang-Yong;Kim, Kwang-Su;Kim, Tae-Won;Jun, Min-Kee;Park, Hea-Kyung
    • Journal of Korean Society of Environmental Engineers
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    • v.35 no.7
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    • pp.472-478
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    • 2013
  • Cu and Cr as a base metal and Pt, Pd as a supportive metal were selected for improving adsorption capacity of activated carbon fiber in eliminating especially targeted VOCs. Preparing variables such as metal loading, loading temperature, loading hours and kinds of loaded metals were changed. Properties measurement was carried out by SEM (scanning electron microscope), XRF (x-ray fluorescence analysis) and EDX (Energy Dispersive X-ray spectrometer) and adsorption capacity evaluation were also performed by gas analyzer. Under this study, the adsorption capacity of complex metal loaded activated carbon fiber was improved positively than that of single metal loaded activated carbon fiber. And we found that the best conditions for metal loading were 5 hours loading time at $100^{\circ}C$ and the adsorption capacity was enhanced almost double compared with other condition based activated carbon fiber. Cu-Cr-Pt-Pd loaded activated carbon fiber showed the best adsorption capacity. Also we confirmed that more than 0.5 second is necessary for adsorbate diffusion and adsorption over activated carbon fiber.

Development of Metal Loaded Activated Carbon Fiber for Eliminating Targeted VOCs Originated from Solvent (특정용제 Target 형 활성금속첨착 활성탄소섬유의 개발)

  • Choi, Kang-Yong;Kim, Kwang-Su;Kim, Tae-Won;Jun, Min-Kee;Park, Hea-Kyung
    • Journal of Korean Society of Environmental Engineers
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    • v.35 no.1
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    • pp.31-37
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    • 2013
  • To acquire enhanced adsorption capacity for especially targeted VOCs, activated carbon fiber of which surface area was $1,100m^2/g$ was selected and active metals were loaded. After screening study, Cr and Cu were selected as a base metal for improving adsorption capacity of activated carbon fiber. For acquiring better performance, metal loading, loading temperature, loading hours and kinds of loaded metals were changed as preparing variables. Properties measurement and adsorption capacity evaluation were performed. We found that the best conditions for metal loading were 5 hours loading at $100^{\circ}C$ and the adsorption capacity was enhanced almost double. Also we confirmed that more than 0.5 seconds contact time is needed for best adsorbate diffusion and adsorption over activated carbon fiber.

Adsorption of VOCs from Dry Cleaning (세탁소 배출 휘발성유기화합물의 흡착 제거 기술)

  • Lee, Seung-Jae;Moon, Seung-Hyun
    • Journal of Korean Society of Environmental Engineers
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    • v.31 no.11
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    • pp.1025-1032
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    • 2009
  • This study investigated a possibility to develop an adsorption process for volatile organic compounds (VOCs) of the solvent emitted during dry cleaning. Pitch activated carbon fiber (ACF) was chosen as an adsorbent of VOCs, and an electric swing adsorption process was utilized for the reproduction of the adsorbent after the completion of VOCs adsorption. Effects of ACF types and several solvents such as trichloroethylene (TCE) and toluene were examined on breakthrough curves and amounts of adsorbed VOCs. ACF was pretreated under various conditions in order to enhance the amounts of the adsorbed VOCs. Temperatures and voltages were measured for the reproduction of the ACF after full adsorption. ACF having micropores exhibited high adsorption of TCE, and high surface area of ACF could increase the adsorption property of toluene. In general, ACF could adsorb 41~54% TCE of the adsorbent weight. The increase of inlet VOCs concentration significantly decreased the breakthrough time and slightly lowered the amounts of adsorbed VOCs. Thus, ACF could effectively adsorb VOCs in low concentration in the feed stream. ACF pretreated by heat under vacuum showed excellent toluene adsorption with controlling oxygen functional groups on the ACF surface, which revealed that vacant carbon site could be the adsorption point of toluene. Most adsorbed toluene was desorbed at $150^{\circ}C$.

The Preparation of Antibacterial Activated Carbon fibers and Their Application (항균성 탄소섬유의 제조와 그의 응용)

  • 오원춘;김범수;장원철
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.1 no.1
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    • pp.43-48
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    • 2000
  • Upon the Preparation of activated carbon fiber(ACF) using chemical activation method and vapour activation method, the fiber obtained from the vapour activation method shows excellent surface Properties. The preparation of antibacterial activated carbon fiber was tried to open the new areas in application of carbon materials. The BET specific surface area and the average pore radius of the antibacterial ACFs were in the range of 844.27~1575.6 $cm^2$/g and 10.6~12.9 (equation omitted), respectively. From the adsorption studies on the antibacterial ACFs, typical Type I isotherms were obtained. And, from the SEM morphology results, it was observed that the surface of ACFs was partially coated by antibacterial materials after the treatment. Finally, from the antibacterial effects of antibacteral ACFs against E. coli, excellent antibacterial activity was shown. Concerning the above results, antibacterial ACFs can have wide application in the areas of sterilization, anti-fragrant. anti-insects.

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Adsorption and Antibacterial Properties of Metal Ion Treated Activated Carbon Fiber (금속이온이 처리된 활성탄소섬유의 흡착과 항균성)

  • Oh, Won-Chun;Bang, Seong-Ho
    • Analytical Science and Technology
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    • v.13 no.2
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    • pp.131-135
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    • 2000
  • We studied adsorption isotherm, surface properties and antibacterial activity of Cu treated activated carbon fiber (ACF). The BET surface area of Cu treated ACF are distributed to $688.2-887.8m^2/g$. The adsorption results show that BET surface areas move gradually to lower value with increasing treated Cu mole concentration. Using t-method, the specific micropore volumes and average pore size were obtained. From the SEM study, it is also observed that many of micropores in activated carbon fiber are blocked surface after the treatment. And we also observed that the activity of E. coli in kind of colon bacillus increases gradually to larger range with increasing Cu mole ratio. From these results, we suggest the antibacterial mechanism for metal treated ACF.

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