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한태욱,김정원,김기태 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.100 No.-
In this study, the freezing-mediated reduction of chromate (Cr(VI)) was investigated using spent coffeeground (SCG) as a reducing agent. The results obtained showed that the rate of Cr(VI) reduction using SCGwas dramatically enhanced in the frozen phase ( 20 C) compared with the aqueous phase (25 C), andafter 3 h of reaction, the residual Cr(VI) concentration in the aqueous phase was 15.25 0.58 mM, whilethat in the frozen phase was only 1.89 0.16 mM (initial experimental conditions: [Cr(VI)]i = 20 mM,[SCG]i = 0.1 g/L, and pHi = 3.0). Additionally, based on the results obtained under different experimentalconditions, the accelerated reduction of Cr(VI) using SCG in the frozen solution could be attributed to thefreeze concentration phenomenon, which is associated with the accumulation of Cr(VI) and protons, aswell as the phenolic compounds in SCG extracts.
Analytical pyrolysis properties of waste medium-density fiberboard and particle board
한태욱,김승도,김영민,Chuichi Watanabe,Norio Teramae,박영권,이윤희 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-
Medium-density fiberboard (MDF) and particle board (PB) showed similar pyrolysis characteristics. Thermogravimetric analysis displayed the main weight loss between 200 and 400 8C, continued up to600 8C. The activation energy (Ea) values at each conversion were in the range of 166–372 kJ/mol for MDFand 161–325 kJ/mol for PB and indicated independent reactions of hemicellulose, cellulose, lignin andchar stabilization. Isothermal pyrolysis produced hemicellulose pyrolyzates at 300 8C. The mainproducts at 400 8C had similar distribution between MDF and PB. At 600 8C, gas products were increaseddue to the secondary cracking of pyrolyzates.
1P-371 해양 거대조류인 Porphyra tenera의 열분해 특성에 대한 연구
한태욱,김영민,이보람,박영권,박현웅,김승도 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
화석연료 고갈과 기후변화 문제를 해결하기 위한 신재생에너지원 개발은 전 세계적으로 활발하게 진행되고 있다. 바이오매스를 이용한 신재생에너지원 개발은 크게 생물학적 처리기술과 열화학적 처리기술로 나눌 수 있으며, 열화학적 처리기술인 열분해는 타 방법과 비교하여 연료 및 화학원료물질로 활용할 수 있는 오일을 회수하는데 큰 장점을 지닌다. 해양 바이오매스인 거대조류는 목질계 바이오매스와 비교하여 높은 CO2 합성률과 생산성을 지녀 바이오에너지화 측면에서 보다 유리한 자원으로 평가 받고 있다. 따라서 본 연구에서는 Porphyra tenera의 TGA 분석 및 Multi-shot Py-GC/MS을 수행하여 동역학 분석과 반응온도에 따른 생성물을 분석을 수행하였으며, 이를 통해 Porphyra tenera의 열분해 특성을 확인하였다. <sup>**</sup>본 연구는 환경부 폐자원에너지화 재활용 전문인력 양성 사업의 지원을 받아 수행되었음(YL-WE-17-001).
Polio/Hepatitis B Chimeric 바이러스의 면역원성
한태욱,유리안,하석훈,박완제,김현수 대한바이러스학회 1992 Journal of Bacteriology and Virology Vol.22 No.2
To construct a polio chimeric virus expressing part of antigen of hepatitis B virus, we inserted a fragment of S gene of hepatitis B virus into a region of the gene encoding C3 epitope of poliovirus cDNA shuttle vector. The resulting plasmid designated pSBS-69 or RNA transcript derived from pSBS-69 was used to transfect vero cells. The cytopathic effect was observed in the transfected cells and viruses were purified from cell extract by ultracentrifugation. Rabbits were innoculated with polio/HB chimeric viruses. After boosting, antibodies were isolated frorn blood of the rabbits and purified by protein A affinity chromatography. Immunoenzyme assay showed that the antibodies had specificity with hepatitis B virus surface antigen (HBs Ag). The data suggested that polio/Hepatitis B chimeric virus had immunogenicity against HBs Ag.
Catalytic conversion of 1,1,1,2-tetrafluoroethane (HFC-134a)
한태욱,유범식,김영민,황병아,Gamal Luckman Sudibya,박영권,김승도 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.8
We examined the conversion of HFC-134a over five catalysts, Na2CO3, CaO, CaCO3, and two types of - Al2O3 with different surface areas, between 300 and 600 oC. HFC-134a was barely converted via the non-catalytic reaction, even at the highest temperature (600 oC). The operating temperatures for the catalytic conversion of HFC-134a were reduced dramatically and its efficiency increased with increasing temperature. Among the catalysts used, -Al2O3 with the larger surface area showed the highest conversion rate of HFC-134a, which was followed, in order, by -Al2O3 with the smaller surface area, CaCO3, CaO, and Na2CO3. The conversion rate of -Al2O3 decreased rapidly due to catalyst deactivation. The catalytic efficiency of -Al2O3 was maintained for a longer period by water addition. Water acted as a hydrogen donor for the dehydrofluorination reaction.