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Comparison of by‑product gas composition by activations of activated carbon
Gi Bbum Lee,Jung Eun Park,Sang Youp Hwang,Ji Hyun Kim,Seokhwi Kim,Ho Kim,Bum Ui Hong 한국탄소학회 2019 Carbon Letters Vol.29 No.3
In this study, commercial activated carbons (ACs) were upgraded by different activation methods, and the gases generated during the activations were defined and quantified. The chemical activation commonly applied for upgrading ACs uses complex reactions, involving pyrolysis, physical, and chemical reactions. The ACs based on wood materials were characterized by elemental analysis, N2 physisorption, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, and temperature-programmed desorption mass spectrometry. The patterns and composition of the generated gases were analyzed by gas chromatography and X-ray diffraction; high-resolution scanning electron microscopy was also used to characterize the activated carbon. The AC was mostly decomposed to CO2 by pyrolysis and physical activation, while CO was mainly detected during chemical activation from the K2CO3 produced by the reactions between CO2 and K2O. The detected amounts of generated gases were differed at various KOH ratios and residence times. The highest surface area obtained in this study was 2000 m2/g at the optimum ratio of AC and KOH (1:2).
이기쁨(Gi bbum Lee),정희숙(Hee Suk Jung),홍범의(Bum ui Hong),김석휘(Seok hwi Kim),최석순(Suk soon Choi) 유기성자원학회 2017 유기물자원화 Vol.25 No.3
본 연구에서는 활성탄 제조에 널리 이용되고 있는 KOH 활성화법으로 활성화된 활성탄의 표면적 증가를 위하여 세척시간, 교반속도, 세척횟수 등의 변수들에 대한 활성탄 세척공정 최적화 연구를 수행하였다. 연구결과, 활성탄의 표면적은 세척효율이 증가됨에 따라 뚜렷하게 증가되었는데, 90% 이상의 세척효율을 얻기 위해서는 활성탄의 복잡한 세공구조에 따른 세공 내 확산메커니즘이 제어인자로 작용함을 알 수 있었다. 또한, 세척액의 증발을 통하여 K₂CO₃를 얻을 수 있었고 이를 이용한 활성화실험이 이루어졌다. 그 결과, 비표면적 2,219 ㎡/g의 제조가 가능하였다. K₂CO₃가 KOH의 효과적인 대안이라는 것을 고려할 때, 활성탄 제조공정에서 폐수 재이용은 무배출 폐기물 공정에 적용 할 수 있음을 보여주었다. In this study, washing parameters such as washing time, agitation velocity, and cycles were optimized for high surface area of the activated carbon (AC) by KOH activation. Even though AC with high surface area showed at higher washing efficiency, over 90% on washing efficiency was regulated by the intra-particle diffusion due to high tortuosity of the pore structures on AC. In addition, we can obtain K₂CO₃ through the evaporation from the wastewater and use it for chemical activation of AC. The AC with K₂CO₃ activation has specific surface area values of 2,219 ㎡/g equally that of KOH activation. Considering that K₂CO₃ is an effective alternative as a KOH, our results demonstrated that the process by recycling wastewater on AC production could be applicable for near-zero wastes.
단신 : Ti 함유 제올라이트 촉매를 이용한 디시클로펜타디엔의 선택적 에폭시화 반응
이기쁨 ( Gi Bbum Lee ),고문규 ( Moon Kyo Ko ),김영운 ( Young Wun Kim ),정근우 ( Keun Wo Chung ),윤병태 ( Byun Tae Yoon ),김성보 ( Seong Bo Kim ) 한국공업화학회 2012 공업화학 Vol.23 No.6
티타늄을 함유하는 제올라이트 촉매를 이용한 디시클로펜타디엔(DCPD)의 선택적 에폭시화 반응에 관한 연구를 수행하였다. 티타늄을 함유하는 제올라이트 계 촉매 중에 Ti-제올라이트 Y촉매가 에폭시화 반응에서 가장 좋은 활성을 보였다. 선정된 Ti-제올라이트 Y촉매를 이용하여 DCPD 에폭시화 반응에 미치는 과산화수소/DCPD의 비, 반응온도, 반응시간, 산처리 영향, 촉매의 양에 관한 여러 변수들의 영향이 연구되어 반응조건들이 DCPD 에폭시 반응에 미치는 영향에 관해 연구하였다. 또한 촉매 제조 방법에 따른 촉매에 존재하는 Ti 구조에 대해 IR과 UV-vis 기기를 이용하여 분석하였다. Ti-containing zeolite was synthesised and used in the epoxidation of di-cyclopentadiene (DCPD). Among various Ti-zeolite catalysts, Y contained Ti-zeolite showed the highest yield in the epoxidation of DCPD. The study was also investigated in terms of the Ti content in the catalysts, H2O2/substrate ratio, reaction temperature and applied time. The reaction conditions significantly influenced on both the catalytic activity and selectivity. In addition, Ti structure in the zeolite was analyzed using IR and UV-vis spectroscopy.
Development of a preservation system for edible/medicinal mushroom resources in Korea
Kang-Hyo Lee,Jae-Gu Han,Jae Han Cho,Ok-Ryeol Kim,Gi-Bbum Nam,Min-Woo Hyun 한국버섯학회 2016 버섯 Vol.20 No.1
Recent enactments of the Nagoya Protocol and UPOV convention precipitated international competition to secure biological resources. To address these challenges in the case of mushroom industry, collecting and preserving the genetic resources are urgently needed. Mushroom Research Division, National Institute of Horticltural and Herbal Science, Rural Development Administration, has operated mushroom resource management facilities which consist of eight separate rooms with automatic temperature and humidity controllers for the safe preservation of mycelial cultures or voucher herbarium specimens. During the past three years the liquid-nitrogen (LN) cryogenic system for the permanent/semi-permanent preservation of the strains commercially or scientifically important are successfully installed, and the computerized resource management system using QR code are adopted. Up to now, 1,586 strains of 261 species in 79 genus of edible and medicinal mushrooms were preserved.
Electrochemical Capacitance of Activated Carbons Regenerated using Thermal and Chemical Activation
Park, Jung Eun,Lee, Gi Bbum,Hwang, Sang Youp The Korean Electrochemical Society 2021 Journal of electrochemical science and technology Vol.12 No.3
Spent activated carbons (SACs) collected from a water treatment plant were regenerated and then adopted as electrochemical material in capacitors. The SACs used in this study were regenerated via two steps, namely thermal and chemical activation. However, during the activation process, the adsorbates were converted into ashes, which caused pore blockage and decreased specific surface area. The regenerated SACs were washed with acid solutions with different levels of acidity (strong: HCl, mild: H<sub>3</sub>PO<sub>4</sub>, and weak: H<sub>2</sub>O<sub>2</sub>) to remove the ashes. The regenerated SACs washed with HCl exhibited the highest specific surface area, although their capacitance was not the highest. Conversely, the specific surface area of regenerated SACs washed using H<sub>3</sub>PO<sub>4</sub> was slightly lower than that of HCl, but exhibited higher capacitance and electrochemical stability. Although the strong acid removed the generated ashes in the pores efficiently, it could adversely affect their structural stability, which would lead to lower capacitance.