http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
박정은(Jung-Eun Park),이기쁨(Gi-Bbum Lee),김석휘(Seok-Hwi Kim),조은서(Eun-Seo Jo),홍범의(Bum-Ui Hong) 한국열환경공학회 2022 열환경공학 Vol.17 No.2
To remove odorous gases generated by medical waste, adsorption capacities of selected odorous gases were analyzed. A polar gas (hydrogen sulfide) was selected along with nonpolar gases, including acetaldehyde, methyl mercaptan, and trimethylamine. Activated carbon was used as an adsorbent. A single-component odorous gas (100 ppm) was supplied at 1L/min; subsequently, the effective adsorption capacity was calculated as the amount adsorbed below 5 pp, of the emission concentration based on the breakthrough point. Activated carbon prepared using pitch precursors exhibited a higher effective adsorption capacity on the specific surface area and surface polar functional groups. Hydrogen sulfide (14.5 mg/g) exhibited the lowest effective adsorption capacity as a single-component odorous gas generated by medical waste, followed by acetaldehyde (18.4 mg/g), methyl mercaptan (43.3 mg/g) and trimethylamine (49.1 mg/g). Compared to nonpolar gases, polar gases exhibited lower effective adsorption capacity. The comparison of the adsorption characteristic of complex gases using the activated carbon adsorbent revealed that the breakthrough point was reached by hydrogen sulfide with a low adsorption capacity. Pitch-precursor activated carbon with a high specific surface area and a many surface polar functional groups demonstrated adsorption characteristics 1.5 times higher than those of commercial activated carbon. Therefore, it would be ideal to use activated carbon adsorbents by setting the minimum detectable concentration based on hydrogen sulfide to remove odors from medical waste.