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백세원,김정랑,임선기 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
To design a good combined adsorbent/catalyst dual functional system for the control of the lowconcentration VOC, both adsorption and catalytic activity test over metal loaded zeolite HY were carried out. Hydrophobic HY zeolite was selected as a good adsorbent candidate among the tested zeolite adsorbents and extended to the catalyst support material by adding various transition metals. The temperature programmed surface reaction (TPSR) of toluene and methylethylketone (MEK) suggested the silver as the best candidate among the tested transition metals. Temperature programmed reductions (TPR) and O2-temperature programmed desorption (O2-TPD) on Ag/HY catalysts were carried out to explain the nature of active centre of Ag catalyst for the toluene oxidation. Silver oxide species or partially oxidized metallic silver on to the surface of metallic silver phase was proposed as an active redox site during the oxidation reaction.
저농도 VOC 제거를 위한 여러 분자체들의 흡착/탈착특성 연구
김정랑,백세원,임선기 한국냄새환경학회 2006 실내환경 및 냄새 학회지 Vol.5 No.3
Volatile organic compounds (VOCs) are considered as one of the main air pollutants, and legislation has already been introduced in many countries to reduce their emissions. In addition to the main emission sources, such as petroleum industries, there are also many local sources, such as painting, printing and laundering etc., which emit low concentrations of VOC. A modified adsorption system (MAS) has been suggested for the control low concentrations and high flow rate streams of VOC. The MAS was based on adsorption, followed by the treatment of concentrated VOC, such as incineration (catalytic or thermal) or recovery. In this paper, the results of the adsorption/desorption of toluene (target VOC) over several adsorbents (activated carbon, hydrophobic zeolites and mesoporous materials) were reviewed for the selection of a good VOC adsorbent for the MAS. From the results, zeolite HY, with a FAU structure, was selected as the most potential adsorbent for the MAS.
박인석,백세원,문기환 한국발생생물학회 2019 발생과 생식 Vol.23 No.3
The sterilization effects of methylene blue (MB), formalin, and iodine on the egg of marine medaka, Oryzias dancena, were investigated for disinfecting naididae worm, Chaetogaster diastrophus through sterilization. To determine harmfulness of MB, formalin, and iodine, lethal concentrations 50 (LC50) of three chemicals were analyzed in the eggs of marine medaka. The sterilized periods of each chemical were set at 1 hr. Sterilized rates of naididae worm in each chemical were significantly affected and increased drastically as the concentration of each chemical increased (p<0.05). Sterilization abilities of naididae worm were most effective for formalin, but survival rates of egg and hatched rates for formalin were lowest among each chemical. The LC50 of MB over 96 hrs were 185.26, 103.84, and 127.15 ppm for adults, juveniles, and eggs respectively. The toxic effects of MB were clearly dose dependent for each life stage (p<0.05). The toxicity sensitivity of juveniles to MB was dramatically higher than that of other groups. In 48 hrs after sterilization, cortisol and glucose concentrations of the adult group with MB treatment were significantly higher than those of the adult group with no treatment (p<0.05). This research provides useful data on sterilization effect of MB, formalin, and iodine, acute toxicity in marine medaka egg and toxicity, sensitivity of life stage of MB in marine medaka.